--- title: Sessions url: https://platform.claude.com/docs/en/api/python/beta/sessions --- # Sessions ## Create Session `beta.sessions.create(**kwargs) -> BetaManagedAgentsSession` **POST** `/v1/sessions` Create Session ### Parameters - `agent: Agent` Agent identifier. Accepts the `agent` ID string, which pins the latest version for the session, or an `agent` object with both id and version specified. - `str` - `class BetaManagedAgentsAgentParams` Specification for an Agent. Provide a specific `version` or use the short-form `agent="agent_id"` for the most recent version - `type: Literal["agent"]` - `id: str` The `agent` ID. minLength: 1, maxLength: 128 - `version: Optional[int]` The specific `agent` version to use. Omit to use the latest version. Must be at least 1 if specified. format: int32 - `class BetaManagedAgentsAgentWithOverridesParams` Reference to an `agent` plus optional configuration overrides. Each provided field replaces the agent's value for the caller's use; the agent resource is unchanged. - `type: Literal["agent_with_overrides"]` - `id: str` The `agent` ID. minLength: 1, maxLength: 128 - `mcp_servers: Optional[List[BetaManagedAgentsURLMCPServerParams]]` Replacement MCP server list. Full replacement: the provided array becomes the MCP servers. Send an empty array to clear; omit to preserve the agent's servers. - `type: Literal["url"]` - `name: str` Unique name for this server, referenced by mcp_toolset configurations. 1-255 characters. minLength: 1, maxLength: 255 - `url: str` Endpoint URL for the MCP server. maxLength: 2048 - `model: Optional[Model]` Replacement model. Accepts the model string, e.g. `claude-opus-5`, or a `model_config` object. Omit to use the agent's model. - `Union[Literal["claude-haiku-5-5", "claude-sonnet-5-5", "claude-opus-5-5", 14 more], str]` - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `class BetaManagedAgentsModelConfigParams` An object that defines additional configuration control over model use - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. Accepts a bare level string (`"high"`) or `{"type": "high"}`. On create, omitting it resolves the per-model default; on update, omitting it leaves the stored value unchanged. - `"low"` Low effort. Favors latency over reasoning depth. - `"medium"` Medium effort. Balances latency and reasoning depth. - `"high"` High effort. Favors reasoning depth. - `"xhigh"` Extra-high effort. Not all models accept this level. - `"max"` Maximum effort. Favors reasoning depth over latency. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. On update, `model` is whole-object replacement — omitting inference_geo clears it. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. Defaults to `standard`. - `"standard"` - `"fast"` - `skills: Optional[List[BetaManagedAgentsSkillParams]]` Replacement skill list. Full replacement: the provided array becomes the skills. Send an empty array to clear; omit to preserve the agent's skills. - `class BetaManagedAgentsAnthropicSkillParams` An Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` Identifier of the Anthropic skill (e.g., "xlsx"). minLength: 1, maxLength: 64 - `version: Optional[str]` Version to pin. Defaults to latest if omitted. minLength: 1, maxLength: 64 - `class BetaManagedAgentsCustomSkillParams` A user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` Tagged ID of the custom skill (e.g., "skill_01XJ5..."). minLength: 1, maxLength: 64 - `version: Optional[str]` Version to pin. Defaults to latest if omitted. minLength: 1, maxLength: 64 - `system: Optional[str]` Replacement system prompt. Up to 100,000 characters. Set to null to clear the agent's system prompt; omit to preserve it. maxLength: 100000 - `tools: Optional[List[Tool]]` Replacement tool list. Full replacement: the provided array becomes the tool configuration. Send an empty array to clear; omit to preserve the agent's tools. - `class BetaManagedAgentsAgentToolset20260401Params` Configuration for built-in agent tools. Use this to enable or disable groups of tools available to the agent. - `type: Literal["agent_toolset_20260401"]` - `configs: Optional[List[BetaManagedAgentsAgentToolConfigParams]]` Per-tool configuration overrides. - `class BetaManagedAgentsBashToolConfigParams` Configuration override for the bash tool. - `type: Optional[Literal["bash"]]` - `name: Literal["bash"]` Must be "bash". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfigParams` Configuration override for the edit tool. - `type: Optional[Literal["edit"]]` - `name: Literal["edit"]` Must be "edit". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfigParams` Configuration override for the read tool. - `type: Optional[Literal["read"]]` - `name: Literal["read"]` Must be "read". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfigParams` Configuration override for the write tool. - `type: Optional[Literal["write"]]` - `name: Literal["write"]` Must be "write". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfigParams` Configuration override for the glob tool. - `type: Optional[Literal["glob"]]` - `name: Literal["glob"]` Must be "glob". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfigParams` Configuration override for the grep tool. - `type: Optional[Literal["grep"]]` - `name: Literal["grep"]` Must be "grep". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfigParams` Configuration override for the web_fetch tool. - `type: Optional[Literal["web_fetch"]]` - `name: Literal["web_fetch"]` Must be "web_fetch". - `allowed_domains: Optional[List[str]]` Only fetch URLs whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "docs.example.com" (no scheme, port, or path). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with blocked_domains. - `blocked_domains: Optional[List[str]]` Never fetch URLs whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "ads.example.com" (no scheme, port, or path). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with allowed_domains. - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `max_content_tokens: Optional[int]` Maximum number of tokens of fetched text content to include in context per call. Does not apply to binary content such as PDFs. format: int32 - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSourcesParams]` Which sources contribute URLs the tool may fetch. Omit to allow every source. - `client_tool_results: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceToolFilter, null]]` Which custom tools' results contribute URLs that may be fetched: "all" (the default), "none", or an only or except list. Each name in a list must be a custom tool in the same tools array. - `Literal["all", "none"]` - `"all"` - `"none"` - `type BetaManagedAgentsWebFetchURLSourceToolFilter = ...` Which tools' results contribute URLs that may be fetched. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceToolFilter, null]]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched: "all" (the default), "none", or an only or except list. Each name in a list must be "web_search" or "web_fetch". - `user_input: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceUserInput, null]]` Whether URLs in the text of user messages may be fetched: "all" (the default) or "none". - `Literal["all", "none"]` - `"all"` - `"none"` - `type BetaManagedAgentsWebFetchURLSourceUserInput = ...` Whether URLs in the text of user messages may be fetched. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `class BetaManagedAgentsWebSearchToolConfigParams` Configuration override for the web_search tool. - `type: Optional[Literal["web_search"]]` - `name: Literal["web_search"]` Must be "web_search". - `allowed_domains: Optional[List[str]]` Only return search results whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "docs.example.com" (no scheme or port; an optional path suffix is accepted). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with blocked_domains. - `blocked_domains: Optional[List[str]]` Never return search results whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "ads.example.com" (no scheme or port; an optional path suffix is accepted). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with allowed_domains. - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: Optional[BetaManagedAgentsAgentToolsetDefaultConfigParams]` Default configuration applied to all tools in this set. - `enabled: Optional[bool]` Whether tools are enabled and available to Claude by default. Defaults to true if not specified. - `permission_policy: Optional[PermissionPolicy]` Default permission policy for tools. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolsetParams` Configuration for tools from an MCP server defined in `mcp_servers`. - `type: Literal["mcp_toolset"]` - `mcp_server_name: str` Name of the MCP server. Must match a server name from the mcp_servers array. 1-255 characters. minLength: 1, maxLength: 255 - `configs: Optional[List[BetaManagedAgentsMCPToolConfigParams]]` Per-tool configuration overrides. - `name: str` Name of the MCP tool to configure. 1-128 characters. minLength: 1, maxLength: 128 - `enabled: Optional[bool]` Whether this tool is enabled. Overrides the `default_config` setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Overrides the `default_config` setting. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: Optional[BetaManagedAgentsMCPToolsetDefaultConfigParams]` Default configuration for all tools from this server. - `enabled: Optional[bool]` Whether tools are enabled by default. Defaults to true if not specified. - `permission_policy: Optional[PermissionPolicy]` Default permission policy for tools from this server. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsCustomToolParams` A custom tool that is executed by the API client rather than the agent. When the agent calls this tool, an `agent.custom_tool_use` event is emitted and the session goes idle, waiting for the client to provide the result via a `user.custom_tool_result` event. - `type: Literal["custom"]` - `description: str` Description of what the tool does, shown to the agent to help it decide when to use the tool. minLength: 1 - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema defining the expected input parameters for the tool. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` Unique name for the tool. 1-128 characters; letters, digits, underscores, and hyphens. minLength: 1, maxLength: 128 - `version: Optional[int]` The specific `agent` version to use. Omit to use the latest version. format: int32 - `environment_id: str` ID of the `environment` defining the container configuration for this session. minLength: 1, maxLength: 128 - `budget: Optional[BetaManagedAgentsBudgetLimitParam]` Enforced spend ceiling for the session. Omit to create an uncapped session. Every model the session can run — the agent's model and each callable agent's model — must have a public list price, or the request is rejected with reason `model_not_budgetable`. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `initial_events: Optional[Iterable[InitialEvent]]` Initial events to send to the `session` at creation, processed in order. Supports `user.message` and `user.define_outcome` events. Maximum 50 events. - `class BetaManagedAgentsUserMessageEventParams` Parameters for sending a user message to the session. - `type: Literal["user.message"]` - `content: Iterable[Content]` Array of content blocks for the user message. - `class BetaManagedAgentsTextBlock` Regular text content. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `type: Literal["image"]` - `source: Source` The source of the image data. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `type: Literal["base64"]` - `data: str` Base64-encoded image data. minLength: 1 - `media_type: str` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). minLength: 1 - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: Literal["url"]` - `url: str` URL of the image to fetch. minLength: 1 - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type: Literal["document"]` - `source: Source` The source of the document data. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `type: Literal["base64"]` - `data: str` Base64-encoded document data. minLength: 1 - `media_type: str` MIME type of the document (e.g., "application/pdf"). minLength: 1 - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `type: Literal["text"]` - `data: str` The plain text content. minLength: 1 - `media_type: Literal["text/plain"]` MIME type of the text content. Must be "text/plain". - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: Literal["url"]` - `url: str` URL of the document to fetch. minLength: 1 - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `context: Optional[str]` Additional context about the document for the model. - `title: Optional[str]` The title of the document. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `type: Literal["redacted"]` - `class BetaManagedAgentsUserDefineOutcomeEventParams` Parameters for defining an outcome the agent should work toward. The agent begins work on receipt. - `type: Literal["user.define_outcome"]` - `description: str` What the agent should produce. This is the task specification. - `rubric: Rubric` How to grade the outcome. Text or file reference. - `class BetaManagedAgentsFileRubricParams` Rubric referenced by a file uploaded via the Files API. - `type: Literal["file"]` - `file_id: str` ID of the rubric file. - `class BetaManagedAgentsTextRubricParams` Rubric content provided inline as text. - `type: Literal["text"]` - `content: str` Rubric content. Plain text or markdown — the grader treats it as freeform text. Maximum 262144 characters. maxLength: 262144 - `max_iterations: Optional[int]` Eval→revision cycles before giving up. Default 3, max 20. format: int32 - `metadata: Optional[Dict[str, str]]` Arbitrary key-value metadata attached to the session. Maximum 16 pairs, keys up to 64 chars, values up to 512 chars. - `resources: Optional[Iterable[Resource]]` Resources (e.g. repositories, files) to mount into the session's container. - `class BetaManagedAgentsGitHubRepositoryResourceParams` Mount a GitHub repository into the session's container. - `type: Literal["github_repository"]` - `url: str` Github URL of the repository minLength: 1, maxLength: 2048 - `authorization_token: Optional[str]` GitHub authorization token used to clone the repository. Required for private repositories; optional for public ones. minLength: 1, maxLength: 4096 - `checkout: Optional[Checkout]` Branch or commit to check out. Defaults to the repository's default branch. - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 - `mount_path: Optional[str]` Mount path in the container. Defaults to `/workspace/`. minLength: 1, maxLength: 4096 - `class BetaManagedAgentsFileResourceParams` Mount a file uploaded via the Files API into the session. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1, maxLength: 128 - `mount_path: Optional[str]` Mount path in the container. Defaults to `/mnt/session/uploads/`. minLength: 1, maxLength: 4096 - `class BetaManagedAgentsMemoryStoreResourceParam` Parameters for attaching a memory store to an agent session. - `type: Literal["memory_store"]` - `memory_store_id: str` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `access: Optional[Literal["read_write", "read_only"]]` Access mode for the mounted store. Defaults to read_write. read_only mounts the store as a read-only filesystem. - `"read_write"` - `"read_only"` - `instructions: Optional[str]` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. maxLength: 4096 - `title: Optional[str]` Human-readable session title. maxLength: 500 - `vault_ids: Optional[Sequence[str]]` Vault IDs for stored credentials the agent can use during the session. - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. ### Returns - `class BetaManagedAgentsSession` A Managed Agents `session`. - `type: Literal["session"]` - `id: str` - `agent: BetaManagedAgentsSessionAgent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 - `archived_at: Optional[datetime]` When the session was archived. Null if not archived. format: date-time - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's enforced spend ceiling, or null when no budget is set. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `environment_id: str` - `metadata: Dict[str, str]` - `outcome_evaluations: List[BetaManagedAgentsOutcomeEvaluationResource]` Per-outcome evaluation state. One entry per `define_outcome` event sent to the session. - `type: Literal["outcome_evaluation"]` - `completed_at: Optional[datetime]` When the outcome reached a terminal result. Null while `pending`/`running`/`evaluating`. format: date-time - `description: str` What the agent should produce. - `explanation: Optional[str]` Grader's verdict text from the most recent evaluation. For `satisfied`, explains why criteria are met; for `needs_revision` (intermediate), what's missing; for `failed`, why unrecoverable. - `iteration: int` 0-indexed revision cycle the outcome is currently on. format: int32 - `outcome_id: str` Server-generated outc_ ID for this outcome. - `result: str` Current evaluation state. `pending` before the agent begins work; `running` while producing or revising; `evaluating` while the grader scores; `satisfied`/`max_iterations_reached`/`failed`/`interrupted` are terminal. - `resources: List[BetaManagedAgentsSessionResource]` - `class BetaManagedAgentsGitHubRepositoryResource` - `type: Literal["github_repository"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `url: str` - `checkout: Optional[Checkout]` - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 - `class BetaManagedAgentsFileResource` - `type: Literal["file"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `file_id: str` - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `class BetaManagedAgentsMemoryStoreResource` A memory store attached to an agent session. - `type: Literal["memory_store"]` - `memory_store_id: str` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `access: Optional[Literal["read_write", "read_only"]]` Access mode for the mounted store. Defaults to `read_write`. `read_only` mounts the store as a read-only filesystem. - `"read_write"` - `"read_only"` - `description: Optional[str]` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `instructions: Optional[str]` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. maxLength: 4096 - `mount_path: Optional[str]` Filesystem path where the store is mounted in the session container, e.g. /mnt/memory/user-preferences. Derived from the store's name. Output-only. - `name: Optional[str]` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `stats: BetaManagedAgentsSessionStats` Timing statistics for the session. - `active_seconds: Optional[float]` Cumulative time in seconds the session spent in `running` status. Excludes idle time. format: double - `duration_seconds: Optional[float]` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. format: double - `status: Literal["rescheduling", "running", "idle", "terminated"]` - `"rescheduling"` Transient error occurred, retrying automatically. - `"running"` Agent is actively executing. - `"idle"` Agent is waiting for input, including user messages or tool confirmations. Sessions start in idle. - `"terminated"` Session has ended, either due to an error or completion. - `title: Optional[str]` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `usage: BetaManagedAgentsSessionUsage` Cumulative token usage for the session. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once, unlike `stats.active_seconds`, which sums each thread's own active time. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. Absent until cost tracking is available for the session. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. Absent until server-tool tracking is available for the session. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `vault_ids: List[str]` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `deployment_id: Optional[str]` Deployment ID when the session was created from a deployment reference. Null otherwise. ### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) beta_managed_agents_session = client.beta.sessions.create( agent="agent_011CZkYpogX7uDKUyvBTophP", environment_id="env_011CZkZ9X2dpNyB7HsEFoRfW", initial_events=[ { "type": "user.message", "content": [ { "type": "text", "text": "Where is my order #1234?", } ], } ], ) print(beta_managed_agents_session.id) ``` #### Response (200) ```json { "id": "sesn_011CZkZAtmR3yMPDzynEDxu7", "agent": { "id": "agent_011CZkYpogX7uDKUyvBTophP", "description": "A general-purpose starter agent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "multiagent": { "agents": [ { "id": "agent_011CZkYqphY8vELVzwCUpqiQ", "description": "A focused research subagent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "name": "Researcher", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" } ], "system": "You are a research subagent that gathers and summarises sources for the coordinating agent.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 } ], "type": "coordinator" }, "name": "My First Agent", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" }, { "skill_id": "skill_011CZkZFNu9hAbo3jZPRgTmx", "type": "custom", "version": "2" } ], "system": "You are a general-purpose agent that can research, write code, run commands, and use connected tools to complete the user's task end to end.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 }, "archived_at": null, "budget": { "max_list_cost": { "amount": "2500", "currency": "USD" }, "type": "limit" }, "created_at": "2026-03-15T10:00:00Z", "environment_id": "env_011CZkZ9X2dpNyB7HsEFoRfW", "metadata": {}, "outcome_evaluations": [ { "completed_at": "2026-03-15T10:02:31Z", "description": "Produce a 2-page summary as summary.md", "explanation": "All five sections present with inline citations.", "iteration": 0, "outcome_id": "outc_011CZkZRSw2kEfs6ncTVmjxP", "result": "satisfied", "type": "outcome_evaluation" } ], "resources": [ { "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht", "created_at": "2026-03-15T10:00:00Z", "file_id": "file_011CNha8iCJcU1wXNR6q4V8w", "mount_path": "/uploads/receipt.pdf", "type": "file", "updated_at": "2026-03-15T10:00:00Z" }, { "id": "sesrsc_011CZkZCKr6eXym1gWMPdQiu", "created_at": "2026-03-15T10:00:00Z", "mount_path": "/workspace/example-repo", "type": "github_repository", "updated_at": "2026-03-15T10:00:00Z", "url": "https://github.com/example-org/example-repo", "checkout": { "name": "main", "type": "branch" } } ], "stats": { "active_seconds": 0, "duration_seconds": 0 }, "status": "idle", "title": "Order #1234 inquiry", "type": "session", "updated_at": "2026-03-15T10:00:00Z", "usage": { "active_seconds": 0, "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "list_cost": { "amount": "2500", "currency": "USD" }, "output_tokens": 0, "server_tool_use": { "web_fetch_requests": 0, "web_search_requests": 3 } }, "vault_ids": [ "vlt_011CZkZDLs7fYzm1hXNPeRjv" ], "deployment_id": "deployment_id" } ``` ## List Sessions `beta.sessions.list(**kwargs) -> SyncBidirectionalPageCursor[BetaManagedAgentsSession]` **GET** `/v1/sessions` List Sessions ### Parameters - `agent_id: Optional[str]` (query parameter) Filter sessions created with this agent ID. - `agent_version: Optional[int]` (query parameter) Filter by agent version. Only applies when `agent_id` is also set. format: int32 - `created_at_gt: Optional[Union[str, datetime]]` (query parameter) Return sessions created after this time (exclusive). format: date-time - `created_at_gte: Optional[Union[str, datetime]]` (query parameter) Return sessions created at or after this time (inclusive). format: date-time - `created_at_lt: Optional[Union[str, datetime]]` (query parameter) Return sessions created before this time (exclusive). format: date-time - `created_at_lte: Optional[Union[str, datetime]]` (query parameter) Return sessions created at or before this time (inclusive). format: date-time - `deployment_id: Optional[str]` (query parameter) Filter sessions created by this deployment ID. - `include_archived: Optional[bool]` (query parameter) When true, includes archived sessions. Default: false (exclude archived). - `limit: Optional[int]` (query parameter) Maximum number of results to return. format: int32 - `memory_store_id: Optional[str]` (query parameter) Filter sessions whose resources contain a `memory_store` with this memory store ID. - `order: Optional[Literal["asc", "desc"]]` (query parameter) Sort direction for results, ordered by `created_at`. Defaults to `desc` (newest first). - `"asc"` - `"desc"` - `page: Optional[str]` (query parameter) Opaque pagination cursor from a previous response. - `statuses: Optional[List[Literal["rescheduling", "running", "idle", "terminated"]]]` (query parameter) Filter by session status. Repeat the parameter to match any of multiple statuses. - `"rescheduling"` Transient error occurred, retrying automatically. - `"running"` Agent is actively executing. - `"idle"` Agent is waiting for input, including user messages or tool confirmations. Sessions start in idle. - `"terminated"` Session has ended, either due to an error or completion. - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. ### Returns - `class BetaManagedAgentsSession` A Managed Agents `session`. - `type: Literal["session"]` - `id: str` - `agent: BetaManagedAgentsSessionAgent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 - `archived_at: Optional[datetime]` When the session was archived. Null if not archived. format: date-time - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's enforced spend ceiling, or null when no budget is set. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `environment_id: str` - `metadata: Dict[str, str]` - `outcome_evaluations: List[BetaManagedAgentsOutcomeEvaluationResource]` Per-outcome evaluation state. One entry per `define_outcome` event sent to the session. - `type: Literal["outcome_evaluation"]` - `completed_at: Optional[datetime]` When the outcome reached a terminal result. Null while `pending`/`running`/`evaluating`. format: date-time - `description: str` What the agent should produce. - `explanation: Optional[str]` Grader's verdict text from the most recent evaluation. For `satisfied`, explains why criteria are met; for `needs_revision` (intermediate), what's missing; for `failed`, why unrecoverable. - `iteration: int` 0-indexed revision cycle the outcome is currently on. format: int32 - `outcome_id: str` Server-generated outc_ ID for this outcome. - `result: str` Current evaluation state. `pending` before the agent begins work; `running` while producing or revising; `evaluating` while the grader scores; `satisfied`/`max_iterations_reached`/`failed`/`interrupted` are terminal. - `resources: List[BetaManagedAgentsSessionResource]` - `class BetaManagedAgentsGitHubRepositoryResource` - `type: Literal["github_repository"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `url: str` - `checkout: Optional[Checkout]` - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 - `class BetaManagedAgentsFileResource` - `type: Literal["file"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `file_id: str` - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `class BetaManagedAgentsMemoryStoreResource` A memory store attached to an agent session. - `type: Literal["memory_store"]` - `memory_store_id: str` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `access: Optional[Literal["read_write", "read_only"]]` Access mode for the mounted store. Defaults to `read_write`. `read_only` mounts the store as a read-only filesystem. - `"read_write"` - `"read_only"` - `description: Optional[str]` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `instructions: Optional[str]` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. maxLength: 4096 - `mount_path: Optional[str]` Filesystem path where the store is mounted in the session container, e.g. /mnt/memory/user-preferences. Derived from the store's name. Output-only. - `name: Optional[str]` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `stats: BetaManagedAgentsSessionStats` Timing statistics for the session. - `active_seconds: Optional[float]` Cumulative time in seconds the session spent in `running` status. Excludes idle time. format: double - `duration_seconds: Optional[float]` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. format: double - `status: Literal["rescheduling", "running", "idle", "terminated"]` - `"rescheduling"` Transient error occurred, retrying automatically. - `"running"` Agent is actively executing. - `"idle"` Agent is waiting for input, including user messages or tool confirmations. Sessions start in idle. - `"terminated"` Session has ended, either due to an error or completion. - `title: Optional[str]` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `usage: BetaManagedAgentsSessionUsage` Cumulative token usage for the session. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once, unlike `stats.active_seconds`, which sums each thread's own active time. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. Absent until cost tracking is available for the session. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. Absent until server-tool tracking is available for the session. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `vault_ids: List[str]` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `deployment_id: Optional[str]` Deployment ID when the session was created from a deployment reference. Null otherwise. ### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) page = client.beta.sessions.list() page = page.data[0] print(page.id) ``` #### Response (200) ```json { "data": [ { "id": "sesn_011CZkZAtmR3yMPDzynEDxu7", "agent": { "id": "agent_011CZkYpogX7uDKUyvBTophP", "description": "A general-purpose starter agent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "multiagent": { "agents": [ { "id": "agent_011CZkYqphY8vELVzwCUpqiQ", "description": "A focused research subagent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "name": "Researcher", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" } ], "system": "You are a research subagent that gathers and summarises sources for the coordinating agent.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 } ], "type": "coordinator" }, "name": "My First Agent", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" }, { "skill_id": "skill_011CZkZFNu9hAbo3jZPRgTmx", "type": "custom", "version": "2" } ], "system": "You are a general-purpose agent that can research, write code, run commands, and use connected tools to complete the user's task end to end.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 }, "archived_at": null, "budget": { "max_list_cost": { "amount": "2500", "currency": "USD" }, "type": "limit" }, "created_at": "2026-03-15T10:00:00Z", "environment_id": "env_011CZkZ9X2dpNyB7HsEFoRfW", "metadata": {}, "outcome_evaluations": [ { "completed_at": "2026-03-15T10:02:31Z", "description": "Produce a 2-page summary as summary.md", "explanation": "All five sections present with inline citations.", "iteration": 0, "outcome_id": "outc_011CZkZRSw2kEfs6ncTVmjxP", "result": "satisfied", "type": "outcome_evaluation" } ], "resources": [ { "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht", "created_at": "2026-03-15T10:00:00Z", "file_id": "file_011CNha8iCJcU1wXNR6q4V8w", "mount_path": "/uploads/receipt.pdf", "type": "file", "updated_at": "2026-03-15T10:00:00Z" }, { "id": "sesrsc_011CZkZCKr6eXym1gWMPdQiu", "created_at": "2026-03-15T10:00:00Z", "mount_path": "/workspace/example-repo", "type": "github_repository", "updated_at": "2026-03-15T10:00:00Z", "url": "https://github.com/example-org/example-repo", "checkout": { "name": "main", "type": "branch" } } ], "stats": { "active_seconds": 0, "duration_seconds": 0 }, "status": "idle", "title": "Order #1234 inquiry", "type": "session", "updated_at": "2026-03-15T10:00:00Z", "usage": { "active_seconds": 0, "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "list_cost": { "amount": "2500", "currency": "USD" }, "output_tokens": 0, "server_tool_use": { "web_fetch_requests": 0, "web_search_requests": 3 } }, "vault_ids": [ "vlt_011CZkZDLs7fYzm1hXNPeRjv" ], "deployment_id": "deployment_id" } ], "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo=", "prev_page": "page_MjAyNS0wNS0xM1QwMDowMDowMFo=" } ``` ## Get Session `beta.sessions.retrieve(session_id, **kwargs) -> BetaManagedAgentsSession` **GET** `/v1/sessions/{session_id}` Get Session ### Parameters - `session_id: str` (path parameter) - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. ### Returns - `class BetaManagedAgentsSession` A Managed Agents `session`. - `type: Literal["session"]` - `id: str` - `agent: BetaManagedAgentsSessionAgent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 - `archived_at: Optional[datetime]` When the session was archived. Null if not archived. format: date-time - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's enforced spend ceiling, or null when no budget is set. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `environment_id: str` - `metadata: Dict[str, str]` - `outcome_evaluations: List[BetaManagedAgentsOutcomeEvaluationResource]` Per-outcome evaluation state. One entry per `define_outcome` event sent to the session. - `type: Literal["outcome_evaluation"]` - `completed_at: Optional[datetime]` When the outcome reached a terminal result. Null while `pending`/`running`/`evaluating`. format: date-time - `description: str` What the agent should produce. - `explanation: Optional[str]` Grader's verdict text from the most recent evaluation. For `satisfied`, explains why criteria are met; for `needs_revision` (intermediate), what's missing; for `failed`, why unrecoverable. - `iteration: int` 0-indexed revision cycle the outcome is currently on. format: int32 - `outcome_id: str` Server-generated outc_ ID for this outcome. - `result: str` Current evaluation state. `pending` before the agent begins work; `running` while producing or revising; `evaluating` while the grader scores; `satisfied`/`max_iterations_reached`/`failed`/`interrupted` are terminal. - `resources: List[BetaManagedAgentsSessionResource]` - `class BetaManagedAgentsGitHubRepositoryResource` - `type: Literal["github_repository"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `url: str` - `checkout: Optional[Checkout]` - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 - `class BetaManagedAgentsFileResource` - `type: Literal["file"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `file_id: str` - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `class BetaManagedAgentsMemoryStoreResource` A memory store attached to an agent session. - `type: Literal["memory_store"]` - `memory_store_id: str` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `access: Optional[Literal["read_write", "read_only"]]` Access mode for the mounted store. Defaults to `read_write`. `read_only` mounts the store as a read-only filesystem. - `"read_write"` - `"read_only"` - `description: Optional[str]` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `instructions: Optional[str]` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. maxLength: 4096 - `mount_path: Optional[str]` Filesystem path where the store is mounted in the session container, e.g. /mnt/memory/user-preferences. Derived from the store's name. Output-only. - `name: Optional[str]` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `stats: BetaManagedAgentsSessionStats` Timing statistics for the session. - `active_seconds: Optional[float]` Cumulative time in seconds the session spent in `running` status. Excludes idle time. format: double - `duration_seconds: Optional[float]` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. format: double - `status: Literal["rescheduling", "running", "idle", "terminated"]` - `"rescheduling"` Transient error occurred, retrying automatically. - `"running"` Agent is actively executing. - `"idle"` Agent is waiting for input, including user messages or tool confirmations. Sessions start in idle. - `"terminated"` Session has ended, either due to an error or completion. - `title: Optional[str]` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `usage: BetaManagedAgentsSessionUsage` Cumulative token usage for the session. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once, unlike `stats.active_seconds`, which sums each thread's own active time. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. Absent until cost tracking is available for the session. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. Absent until server-tool tracking is available for the session. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `vault_ids: List[str]` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `deployment_id: Optional[str]` Deployment ID when the session was created from a deployment reference. Null otherwise. ### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) beta_managed_agents_session = client.beta.sessions.retrieve( session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) print(beta_managed_agents_session.id) ``` #### Response (200) ```json { "id": "sesn_011CZkZAtmR3yMPDzynEDxu7", "agent": { "id": "agent_011CZkYpogX7uDKUyvBTophP", "description": "A general-purpose starter agent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "multiagent": { "agents": [ { "id": "agent_011CZkYqphY8vELVzwCUpqiQ", "description": "A focused research subagent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "name": "Researcher", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" } ], "system": "You are a research subagent that gathers and summarises sources for the coordinating agent.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 } ], "type": "coordinator" }, "name": "My First Agent", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" }, { "skill_id": "skill_011CZkZFNu9hAbo3jZPRgTmx", "type": "custom", "version": "2" } ], "system": "You are a general-purpose agent that can research, write code, run commands, and use connected tools to complete the user's task end to end.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 }, "archived_at": null, "budget": { "max_list_cost": { "amount": "2500", "currency": "USD" }, "type": "limit" }, "created_at": "2026-03-15T10:00:00Z", "environment_id": "env_011CZkZ9X2dpNyB7HsEFoRfW", "metadata": {}, "outcome_evaluations": [ { "completed_at": "2026-03-15T10:02:31Z", "description": "Produce a 2-page summary as summary.md", "explanation": "All five sections present with inline citations.", "iteration": 0, "outcome_id": "outc_011CZkZRSw2kEfs6ncTVmjxP", "result": "satisfied", "type": "outcome_evaluation" } ], "resources": [ { "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht", "created_at": "2026-03-15T10:00:00Z", "file_id": "file_011CNha8iCJcU1wXNR6q4V8w", "mount_path": "/uploads/receipt.pdf", "type": "file", "updated_at": "2026-03-15T10:00:00Z" }, { "id": "sesrsc_011CZkZCKr6eXym1gWMPdQiu", "created_at": "2026-03-15T10:00:00Z", "mount_path": "/workspace/example-repo", "type": "github_repository", "updated_at": "2026-03-15T10:00:00Z", "url": "https://github.com/example-org/example-repo", "checkout": { "name": "main", "type": "branch" } } ], "stats": { "active_seconds": 0, "duration_seconds": 0 }, "status": "idle", "title": "Order #1234 inquiry", "type": "session", "updated_at": "2026-03-15T10:00:00Z", "usage": { "active_seconds": 0, "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "list_cost": { "amount": "2500", "currency": "USD" }, "output_tokens": 0, "server_tool_use": { "web_fetch_requests": 0, "web_search_requests": 3 } }, "vault_ids": [ "vlt_011CZkZDLs7fYzm1hXNPeRjv" ], "deployment_id": "deployment_id" } ``` ## Update Session `beta.sessions.update(session_id, **kwargs) -> BetaManagedAgentsSession` **POST** `/v1/sessions/{session_id}` Update Session ### Parameters - `session_id: str` (path parameter) - `agent: Optional[BetaManagedAgentsSessionAgentUpdateParam]` Agent configuration update. Only `tools` and `mcp_servers` are updatable mid-session. Only valid for sessions created from an agent or deployment reference. The session must not be running. - `mcp_servers: Optional[List[BetaManagedAgentsURLMCPServerParams]]` Replacement MCP server list. Full replacement: the provided array becomes the new value. Send an empty array to clear; omit to preserve. - `type: Literal["url"]` - `name: str` Unique name for this server, referenced by mcp_toolset configurations. 1-255 characters. minLength: 1, maxLength: 255 - `url: str` Endpoint URL for the MCP server. maxLength: 2048 - `tools: Optional[List[Tool]]` Replacement tool list. Full replacement: the provided array becomes the new value. Send an empty array to clear; omit to preserve. - `class BetaManagedAgentsAgentToolset20260401Params` Configuration for built-in agent tools. Use this to enable or disable groups of tools available to the agent. - `type: Literal["agent_toolset_20260401"]` - `configs: Optional[List[BetaManagedAgentsAgentToolConfigParams]]` Per-tool configuration overrides. - `class BetaManagedAgentsBashToolConfigParams` Configuration override for the bash tool. - `type: Optional[Literal["bash"]]` - `name: Literal["bash"]` Must be "bash". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfigParams` Configuration override for the edit tool. - `type: Optional[Literal["edit"]]` - `name: Literal["edit"]` Must be "edit". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfigParams` Configuration override for the read tool. - `type: Optional[Literal["read"]]` - `name: Literal["read"]` Must be "read". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfigParams` Configuration override for the write tool. - `type: Optional[Literal["write"]]` - `name: Literal["write"]` Must be "write". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfigParams` Configuration override for the glob tool. - `type: Optional[Literal["glob"]]` - `name: Literal["glob"]` Must be "glob". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfigParams` Configuration override for the grep tool. - `type: Optional[Literal["grep"]]` - `name: Literal["grep"]` Must be "grep". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfigParams` Configuration override for the web_fetch tool. - `type: Optional[Literal["web_fetch"]]` - `name: Literal["web_fetch"]` Must be "web_fetch". - `allowed_domains: Optional[List[str]]` Only fetch URLs whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "docs.example.com" (no scheme, port, or path). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with blocked_domains. - `blocked_domains: Optional[List[str]]` Never fetch URLs whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "ads.example.com" (no scheme, port, or path). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with allowed_domains. - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `max_content_tokens: Optional[int]` Maximum number of tokens of fetched text content to include in context per call. Does not apply to binary content such as PDFs. format: int32 - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSourcesParams]` Which sources contribute URLs the tool may fetch. Omit to allow every source. - `client_tool_results: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceToolFilter, null]]` Which custom tools' results contribute URLs that may be fetched: "all" (the default), "none", or an only or except list. Each name in a list must be a custom tool in the same tools array. - `Literal["all", "none"]` - `"all"` - `"none"` - `type BetaManagedAgentsWebFetchURLSourceToolFilter = ...` Which tools' results contribute URLs that may be fetched. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceToolFilter, null]]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched: "all" (the default), "none", or an only or except list. Each name in a list must be "web_search" or "web_fetch". - `user_input: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceUserInput, null]]` Whether URLs in the text of user messages may be fetched: "all" (the default) or "none". - `Literal["all", "none"]` - `"all"` - `"none"` - `type BetaManagedAgentsWebFetchURLSourceUserInput = ...` Whether URLs in the text of user messages may be fetched. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `class BetaManagedAgentsWebSearchToolConfigParams` Configuration override for the web_search tool. - `type: Optional[Literal["web_search"]]` - `name: Literal["web_search"]` Must be "web_search". - `allowed_domains: Optional[List[str]]` Only return search results whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "docs.example.com" (no scheme or port; an optional path suffix is accepted). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with blocked_domains. - `blocked_domains: Optional[List[str]]` Never return search results whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "ads.example.com" (no scheme or port; an optional path suffix is accepted). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with allowed_domains. - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: Optional[BetaManagedAgentsAgentToolsetDefaultConfigParams]` Default configuration applied to all tools in this set. - `enabled: Optional[bool]` Whether tools are enabled and available to Claude by default. Defaults to true if not specified. - `permission_policy: Optional[PermissionPolicy]` Default permission policy for tools. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolsetParams` Configuration for tools from an MCP server defined in `mcp_servers`. - `type: Literal["mcp_toolset"]` - `mcp_server_name: str` Name of the MCP server. Must match a server name from the mcp_servers array. 1-255 characters. minLength: 1, maxLength: 255 - `configs: Optional[List[BetaManagedAgentsMCPToolConfigParams]]` Per-tool configuration overrides. - `name: str` Name of the MCP tool to configure. 1-128 characters. minLength: 1, maxLength: 128 - `enabled: Optional[bool]` Whether this tool is enabled. Overrides the `default_config` setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Overrides the `default_config` setting. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: Optional[BetaManagedAgentsMCPToolsetDefaultConfigParams]` Default configuration for all tools from this server. - `enabled: Optional[bool]` Whether tools are enabled by default. Defaults to true if not specified. - `permission_policy: Optional[PermissionPolicy]` Default permission policy for tools from this server. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsCustomToolParams` A custom tool that is executed by the API client rather than the agent. When the agent calls this tool, an `agent.custom_tool_use` event is emitted and the session goes idle, waiting for the client to provide the result via a `user.custom_tool_result` event. - `type: Literal["custom"]` - `description: str` Description of what the tool does, shown to the agent to help it decide when to use the tool. minLength: 1 - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema defining the expected input parameters for the tool. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` Unique name for the tool. 1-128 characters; letters, digits, underscores, and hyphens. minLength: 1, maxLength: 128 - `budget: Optional[BetaManagedAgentsBudgetLimitParam]` Enforced spend ceiling for the session. Set an object to replace the budget of a session that was created with one, or `null` to remove it; omit to preserve. A budget cannot be added to a session created without one (rejected with reason `budget_create_only`), and a removed budget cannot be re-added. Allowed in any non-terminated status. Lowering `max_list_cost` to at or below the session's consumed list cost is rejected with reason `budget_not_raised`, and every model the session can run must have a public list price or the request is rejected with reason `model_not_budgetable`. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `metadata: Optional[Dict[str, Optional[str]]]` Metadata patch. Set a key to a string to upsert it, or to null to delete it. Omit the field to preserve. - `title: Optional[str]` Human-readable session title. minLength: 1, maxLength: 500 - `vault_ids: Optional[Sequence[str]]` Vault IDs (`vlt_*`) to attach to the session. Not yet supported; requests setting this field are rejected. Reserved for future use. - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. ### Returns - `class BetaManagedAgentsSession` A Managed Agents `session`. - `type: Literal["session"]` - `id: str` - `agent: BetaManagedAgentsSessionAgent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 - `archived_at: Optional[datetime]` When the session was archived. Null if not archived. format: date-time - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's enforced spend ceiling, or null when no budget is set. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `environment_id: str` - `metadata: Dict[str, str]` - `outcome_evaluations: List[BetaManagedAgentsOutcomeEvaluationResource]` Per-outcome evaluation state. One entry per `define_outcome` event sent to the session. - `type: Literal["outcome_evaluation"]` - `completed_at: Optional[datetime]` When the outcome reached a terminal result. Null while `pending`/`running`/`evaluating`. format: date-time - `description: str` What the agent should produce. - `explanation: Optional[str]` Grader's verdict text from the most recent evaluation. For `satisfied`, explains why criteria are met; for `needs_revision` (intermediate), what's missing; for `failed`, why unrecoverable. - `iteration: int` 0-indexed revision cycle the outcome is currently on. format: int32 - `outcome_id: str` Server-generated outc_ ID for this outcome. - `result: str` Current evaluation state. `pending` before the agent begins work; `running` while producing or revising; `evaluating` while the grader scores; `satisfied`/`max_iterations_reached`/`failed`/`interrupted` are terminal. - `resources: List[BetaManagedAgentsSessionResource]` - `class BetaManagedAgentsGitHubRepositoryResource` - `type: Literal["github_repository"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `url: str` - `checkout: Optional[Checkout]` - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 - `class BetaManagedAgentsFileResource` - `type: Literal["file"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `file_id: str` - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `class BetaManagedAgentsMemoryStoreResource` A memory store attached to an agent session. - `type: Literal["memory_store"]` - `memory_store_id: str` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `access: Optional[Literal["read_write", "read_only"]]` Access mode for the mounted store. Defaults to `read_write`. `read_only` mounts the store as a read-only filesystem. - `"read_write"` - `"read_only"` - `description: Optional[str]` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `instructions: Optional[str]` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. maxLength: 4096 - `mount_path: Optional[str]` Filesystem path where the store is mounted in the session container, e.g. /mnt/memory/user-preferences. Derived from the store's name. Output-only. - `name: Optional[str]` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `stats: BetaManagedAgentsSessionStats` Timing statistics for the session. - `active_seconds: Optional[float]` Cumulative time in seconds the session spent in `running` status. Excludes idle time. format: double - `duration_seconds: Optional[float]` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. format: double - `status: Literal["rescheduling", "running", "idle", "terminated"]` - `"rescheduling"` Transient error occurred, retrying automatically. - `"running"` Agent is actively executing. - `"idle"` Agent is waiting for input, including user messages or tool confirmations. Sessions start in idle. - `"terminated"` Session has ended, either due to an error or completion. - `title: Optional[str]` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `usage: BetaManagedAgentsSessionUsage` Cumulative token usage for the session. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once, unlike `stats.active_seconds`, which sums each thread's own active time. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. Absent until cost tracking is available for the session. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. Absent until server-tool tracking is available for the session. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `vault_ids: List[str]` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `deployment_id: Optional[str]` Deployment ID when the session was created from a deployment reference. Null otherwise. ### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) beta_managed_agents_session = client.beta.sessions.update( session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) print(beta_managed_agents_session.id) ``` #### Response (200) ```json { "id": "sesn_011CZkZAtmR3yMPDzynEDxu7", "agent": { "id": "agent_011CZkYpogX7uDKUyvBTophP", "description": "A general-purpose starter agent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "multiagent": { "agents": [ { "id": "agent_011CZkYqphY8vELVzwCUpqiQ", "description": "A focused research subagent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "name": "Researcher", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" } ], "system": "You are a research subagent that gathers and summarises sources for the coordinating agent.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 } ], "type": "coordinator" }, "name": "My First Agent", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" }, { "skill_id": "skill_011CZkZFNu9hAbo3jZPRgTmx", "type": "custom", "version": "2" } ], "system": "You are a general-purpose agent that can research, write code, run commands, and use connected tools to complete the user's task end to end.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 }, "archived_at": null, "budget": { "max_list_cost": { "amount": "2500", "currency": "USD" }, "type": "limit" }, "created_at": "2026-03-15T10:00:00Z", "environment_id": "env_011CZkZ9X2dpNyB7HsEFoRfW", "metadata": {}, "outcome_evaluations": [ { "completed_at": "2026-03-15T10:02:31Z", "description": "Produce a 2-page summary as summary.md", "explanation": "All five sections present with inline citations.", "iteration": 0, "outcome_id": "outc_011CZkZRSw2kEfs6ncTVmjxP", "result": "satisfied", "type": "outcome_evaluation" } ], "resources": [ { "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht", "created_at": "2026-03-15T10:00:00Z", "file_id": "file_011CNha8iCJcU1wXNR6q4V8w", "mount_path": "/uploads/receipt.pdf", "type": "file", "updated_at": "2026-03-15T10:00:00Z" }, { "id": "sesrsc_011CZkZCKr6eXym1gWMPdQiu", "created_at": "2026-03-15T10:00:00Z", "mount_path": "/workspace/example-repo", "type": "github_repository", "updated_at": "2026-03-15T10:00:00Z", "url": "https://github.com/example-org/example-repo", "checkout": { "name": "main", "type": "branch" } } ], "stats": { "active_seconds": 0, "duration_seconds": 0 }, "status": "idle", "title": "Order #1234 inquiry", "type": "session", "updated_at": "2026-03-15T10:00:00Z", "usage": { "active_seconds": 0, "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "list_cost": { "amount": "2500", "currency": "USD" }, "output_tokens": 0, "server_tool_use": { "web_fetch_requests": 0, "web_search_requests": 3 } }, "vault_ids": [ "vlt_011CZkZDLs7fYzm1hXNPeRjv" ], "deployment_id": "deployment_id" } ``` ## Delete Session `beta.sessions.delete(session_id, **kwargs) -> BetaManagedAgentsDeletedSession` **DELETE** `/v1/sessions/{session_id}` Delete Session ### Parameters - `session_id: str` (path parameter) - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. ### Returns - `class BetaManagedAgentsDeletedSession` Confirmation that a `session` has been permanently deleted. - `type: Literal["session_deleted"]` - `id: str` ### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) beta_managed_agents_deleted_session = client.beta.sessions.delete( session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) print(beta_managed_agents_deleted_session.id) ``` #### Response (200) ```json { "id": "sesn_011CZkZAtmR3yMPDzynEDxu7", "type": "session_deleted" } ``` ## Archive Session `beta.sessions.archive(session_id, **kwargs) -> BetaManagedAgentsSession` **POST** `/v1/sessions/{session_id}/archive` Archive Session ### Parameters - `session_id: str` (path parameter) - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. ### Returns - `class BetaManagedAgentsSession` A Managed Agents `session`. - `type: Literal["session"]` - `id: str` - `agent: BetaManagedAgentsSessionAgent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 - `archived_at: Optional[datetime]` When the session was archived. Null if not archived. format: date-time - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's enforced spend ceiling, or null when no budget is set. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `environment_id: str` - `metadata: Dict[str, str]` - `outcome_evaluations: List[BetaManagedAgentsOutcomeEvaluationResource]` Per-outcome evaluation state. One entry per `define_outcome` event sent to the session. - `type: Literal["outcome_evaluation"]` - `completed_at: Optional[datetime]` When the outcome reached a terminal result. Null while `pending`/`running`/`evaluating`. format: date-time - `description: str` What the agent should produce. - `explanation: Optional[str]` Grader's verdict text from the most recent evaluation. For `satisfied`, explains why criteria are met; for `needs_revision` (intermediate), what's missing; for `failed`, why unrecoverable. - `iteration: int` 0-indexed revision cycle the outcome is currently on. format: int32 - `outcome_id: str` Server-generated outc_ ID for this outcome. - `result: str` Current evaluation state. `pending` before the agent begins work; `running` while producing or revising; `evaluating` while the grader scores; `satisfied`/`max_iterations_reached`/`failed`/`interrupted` are terminal. - `resources: List[BetaManagedAgentsSessionResource]` - `class BetaManagedAgentsGitHubRepositoryResource` - `type: Literal["github_repository"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `url: str` - `checkout: Optional[Checkout]` - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 - `class BetaManagedAgentsFileResource` - `type: Literal["file"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `file_id: str` - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `class BetaManagedAgentsMemoryStoreResource` A memory store attached to an agent session. - `type: Literal["memory_store"]` - `memory_store_id: str` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `access: Optional[Literal["read_write", "read_only"]]` Access mode for the mounted store. Defaults to `read_write`. `read_only` mounts the store as a read-only filesystem. - `"read_write"` - `"read_only"` - `description: Optional[str]` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `instructions: Optional[str]` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. maxLength: 4096 - `mount_path: Optional[str]` Filesystem path where the store is mounted in the session container, e.g. /mnt/memory/user-preferences. Derived from the store's name. Output-only. - `name: Optional[str]` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `stats: BetaManagedAgentsSessionStats` Timing statistics for the session. - `active_seconds: Optional[float]` Cumulative time in seconds the session spent in `running` status. Excludes idle time. format: double - `duration_seconds: Optional[float]` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. format: double - `status: Literal["rescheduling", "running", "idle", "terminated"]` - `"rescheduling"` Transient error occurred, retrying automatically. - `"running"` Agent is actively executing. - `"idle"` Agent is waiting for input, including user messages or tool confirmations. Sessions start in idle. - `"terminated"` Session has ended, either due to an error or completion. - `title: Optional[str]` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `usage: BetaManagedAgentsSessionUsage` Cumulative token usage for the session. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once, unlike `stats.active_seconds`, which sums each thread's own active time. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. Absent until cost tracking is available for the session. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. Absent until server-tool tracking is available for the session. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `vault_ids: List[str]` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `deployment_id: Optional[str]` Deployment ID when the session was created from a deployment reference. Null otherwise. ### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) beta_managed_agents_session = client.beta.sessions.archive( session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) print(beta_managed_agents_session.id) ``` #### Response (200) ```json { "id": "sesn_011CZkZAtmR3yMPDzynEDxu7", "agent": { "id": "agent_011CZkYpogX7uDKUyvBTophP", "description": "A general-purpose starter agent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "multiagent": { "agents": [ { "id": "agent_011CZkYqphY8vELVzwCUpqiQ", "description": "A focused research subagent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "name": "Researcher", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" } ], "system": "You are a research subagent that gathers and summarises sources for the coordinating agent.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 } ], "type": "coordinator" }, "name": "My First Agent", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" }, { "skill_id": "skill_011CZkZFNu9hAbo3jZPRgTmx", "type": "custom", "version": "2" } ], "system": "You are a general-purpose agent that can research, write code, run commands, and use connected tools to complete the user's task end to end.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 }, "archived_at": null, "budget": { "max_list_cost": { "amount": "2500", "currency": "USD" }, "type": "limit" }, "created_at": "2026-03-15T10:00:00Z", "environment_id": "env_011CZkZ9X2dpNyB7HsEFoRfW", "metadata": {}, "outcome_evaluations": [ { "completed_at": "2026-03-15T10:02:31Z", "description": "Produce a 2-page summary as summary.md", "explanation": "All five sections present with inline citations.", "iteration": 0, "outcome_id": "outc_011CZkZRSw2kEfs6ncTVmjxP", "result": "satisfied", "type": "outcome_evaluation" } ], "resources": [ { "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht", "created_at": "2026-03-15T10:00:00Z", "file_id": "file_011CNha8iCJcU1wXNR6q4V8w", "mount_path": "/uploads/receipt.pdf", "type": "file", "updated_at": "2026-03-15T10:00:00Z" }, { "id": "sesrsc_011CZkZCKr6eXym1gWMPdQiu", "created_at": "2026-03-15T10:00:00Z", "mount_path": "/workspace/example-repo", "type": "github_repository", "updated_at": "2026-03-15T10:00:00Z", "url": "https://github.com/example-org/example-repo", "checkout": { "name": "main", "type": "branch" } } ], "stats": { "active_seconds": 0, "duration_seconds": 0 }, "status": "idle", "title": "Order #1234 inquiry", "type": "session", "updated_at": "2026-03-15T10:00:00Z", "usage": { "active_seconds": 0, "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "list_cost": { "amount": "2500", "currency": "USD" }, "output_tokens": 0, "server_tool_use": { "web_fetch_requests": 0, "web_search_requests": 3 } }, "vault_ids": [ "vlt_011CZkZDLs7fYzm1hXNPeRjv" ], "deployment_id": "deployment_id" } ``` ## Domain types ### Beta Managed Agents Advisor Params - `class BetaManagedAgentsAdvisorParams` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. At most one per roster; the entry occupies the roster name `anthropic.advisor`. - `type: Literal["advisor"]` - `model: str` A Claude model id. The model must be permitted as an advisor for this agent's model. minLength: 1, maxLength: 256 ### Beta Managed Agents Agent Message Preview - `class BetaManagedAgentsAgentMessagePreview` - `type: Literal["agent.message"]` - `id: str` The id the buffered agent.message will carry if it is emitted. Matches the event_id on this preview's event_delta events. ### Beta Managed Agents Agent Params - `class BetaManagedAgentsAgentParams` Specification for an Agent. Provide a specific `version` or use the short-form `agent="agent_id"` for the most recent version - `type: Literal["agent"]` - `id: str` The `agent` ID. minLength: 1, maxLength: 128 - `version: Optional[int]` The specific `agent` version to use. Omit to use the latest version. Must be at least 1 if specified. format: int32 ### Beta Managed Agents Agent Thinking Preview - `class BetaManagedAgentsAgentThinkingPreview` - `type: Literal["agent.thinking"]` - `id: str` The id the buffered agent.thinking will carry if it is emitted. Start-only — no event_delta events follow. ### Beta Managed Agents Agent With Overrides Params - `class BetaManagedAgentsAgentWithOverridesParams` Reference to an `agent` plus optional configuration overrides. Each provided field replaces the agent's value for the caller's use; the agent resource is unchanged. - `type: Literal["agent_with_overrides"]` - `id: str` The `agent` ID. minLength: 1, maxLength: 128 - `mcp_servers: Optional[List[BetaManagedAgentsURLMCPServerParams]]` Replacement MCP server list. Full replacement: the provided array becomes the MCP servers. Send an empty array to clear; omit to preserve the agent's servers. - `type: Literal["url"]` - `name: str` Unique name for this server, referenced by mcp_toolset configurations. 1-255 characters. minLength: 1, maxLength: 255 - `url: str` Endpoint URL for the MCP server. maxLength: 2048 - `model: Optional[Model]` Replacement model. Accepts the model string, e.g. `claude-opus-5`, or a `model_config` object. Omit to use the agent's model. - `Union[Literal["claude-haiku-5-5", "claude-sonnet-5-5", "claude-opus-5-5", 14 more], str]` - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `class BetaManagedAgentsModelConfigParams` An object that defines additional configuration control over model use - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. Accepts a bare level string (`"high"`) or `{"type": "high"}`. On create, omitting it resolves the per-model default; on update, omitting it leaves the stored value unchanged. - `"low"` Low effort. Favors latency over reasoning depth. - `"medium"` Medium effort. Balances latency and reasoning depth. - `"high"` High effort. Favors reasoning depth. - `"xhigh"` Extra-high effort. Not all models accept this level. - `"max"` Maximum effort. Favors reasoning depth over latency. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. On update, `model` is whole-object replacement — omitting inference_geo clears it. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. Defaults to `standard`. - `"standard"` - `"fast"` - `skills: Optional[List[BetaManagedAgentsSkillParams]]` Replacement skill list. Full replacement: the provided array becomes the skills. Send an empty array to clear; omit to preserve the agent's skills. - `class BetaManagedAgentsAnthropicSkillParams` An Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` Identifier of the Anthropic skill (e.g., "xlsx"). minLength: 1, maxLength: 64 - `version: Optional[str]` Version to pin. Defaults to latest if omitted. minLength: 1, maxLength: 64 - `class BetaManagedAgentsCustomSkillParams` A user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` Tagged ID of the custom skill (e.g., "skill_01XJ5..."). minLength: 1, maxLength: 64 - `version: Optional[str]` Version to pin. Defaults to latest if omitted. minLength: 1, maxLength: 64 - `system: Optional[str]` Replacement system prompt. Up to 100,000 characters. Set to null to clear the agent's system prompt; omit to preserve it. maxLength: 100000 - `tools: Optional[List[Tool]]` Replacement tool list. Full replacement: the provided array becomes the tool configuration. Send an empty array to clear; omit to preserve the agent's tools. - `class BetaManagedAgentsAgentToolset20260401Params` Configuration for built-in agent tools. Use this to enable or disable groups of tools available to the agent. - `type: Literal["agent_toolset_20260401"]` - `configs: Optional[List[BetaManagedAgentsAgentToolConfigParams]]` Per-tool configuration overrides. - `class BetaManagedAgentsBashToolConfigParams` Configuration override for the bash tool. - `type: Optional[Literal["bash"]]` - `name: Literal["bash"]` Must be "bash". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfigParams` Configuration override for the edit tool. - `type: Optional[Literal["edit"]]` - `name: Literal["edit"]` Must be "edit". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfigParams` Configuration override for the read tool. - `type: Optional[Literal["read"]]` - `name: Literal["read"]` Must be "read". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfigParams` Configuration override for the write tool. - `type: Optional[Literal["write"]]` - `name: Literal["write"]` Must be "write". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfigParams` Configuration override for the glob tool. - `type: Optional[Literal["glob"]]` - `name: Literal["glob"]` Must be "glob". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfigParams` Configuration override for the grep tool. - `type: Optional[Literal["grep"]]` - `name: Literal["grep"]` Must be "grep". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfigParams` Configuration override for the web_fetch tool. - `type: Optional[Literal["web_fetch"]]` - `name: Literal["web_fetch"]` Must be "web_fetch". - `allowed_domains: Optional[List[str]]` Only fetch URLs whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "docs.example.com" (no scheme, port, or path). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with blocked_domains. - `blocked_domains: Optional[List[str]]` Never fetch URLs whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "ads.example.com" (no scheme, port, or path). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with allowed_domains. - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `max_content_tokens: Optional[int]` Maximum number of tokens of fetched text content to include in context per call. Does not apply to binary content such as PDFs. format: int32 - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSourcesParams]` Which sources contribute URLs the tool may fetch. Omit to allow every source. - `client_tool_results: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceToolFilter, null]]` Which custom tools' results contribute URLs that may be fetched: "all" (the default), "none", or an only or except list. Each name in a list must be a custom tool in the same tools array. - `Literal["all", "none"]` - `"all"` - `"none"` - `type BetaManagedAgentsWebFetchURLSourceToolFilter = ...` Which tools' results contribute URLs that may be fetched. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceToolFilter, null]]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched: "all" (the default), "none", or an only or except list. Each name in a list must be "web_search" or "web_fetch". - `user_input: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceUserInput, null]]` Whether URLs in the text of user messages may be fetched: "all" (the default) or "none". - `Literal["all", "none"]` - `"all"` - `"none"` - `type BetaManagedAgentsWebFetchURLSourceUserInput = ...` Whether URLs in the text of user messages may be fetched. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `class BetaManagedAgentsWebSearchToolConfigParams` Configuration override for the web_search tool. - `type: Optional[Literal["web_search"]]` - `name: Literal["web_search"]` Must be "web_search". - `allowed_domains: Optional[List[str]]` Only return search results whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "docs.example.com" (no scheme or port; an optional path suffix is accepted). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with blocked_domains. - `blocked_domains: Optional[List[str]]` Never return search results whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "ads.example.com" (no scheme or port; an optional path suffix is accepted). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with allowed_domains. - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: Optional[BetaManagedAgentsAgentToolsetDefaultConfigParams]` Default configuration applied to all tools in this set. - `enabled: Optional[bool]` Whether tools are enabled and available to Claude by default. Defaults to true if not specified. - `permission_policy: Optional[PermissionPolicy]` Default permission policy for tools. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolsetParams` Configuration for tools from an MCP server defined in `mcp_servers`. - `type: Literal["mcp_toolset"]` - `mcp_server_name: str` Name of the MCP server. Must match a server name from the mcp_servers array. 1-255 characters. minLength: 1, maxLength: 255 - `configs: Optional[List[BetaManagedAgentsMCPToolConfigParams]]` Per-tool configuration overrides. - `name: str` Name of the MCP tool to configure. 1-128 characters. minLength: 1, maxLength: 128 - `enabled: Optional[bool]` Whether this tool is enabled. Overrides the `default_config` setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Overrides the `default_config` setting. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: Optional[BetaManagedAgentsMCPToolsetDefaultConfigParams]` Default configuration for all tools from this server. - `enabled: Optional[bool]` Whether tools are enabled by default. Defaults to true if not specified. - `permission_policy: Optional[PermissionPolicy]` Default permission policy for tools from this server. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsCustomToolParams` A custom tool that is executed by the API client rather than the agent. When the agent calls this tool, an `agent.custom_tool_use` event is emitted and the session goes idle, waiting for the client to provide the result via a `user.custom_tool_result` event. - `type: Literal["custom"]` - `description: str` Description of what the tool does, shown to the agent to help it decide when to use the tool. minLength: 1 - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema defining the expected input parameters for the tool. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` Unique name for the tool. 1-128 characters; letters, digits, underscores, and hyphens. minLength: 1, maxLength: 128 - `version: Optional[int]` The specific `agent` version to use. Omit to use the latest version. format: int32 ### Beta Managed Agents Branch Checkout - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 ### Beta Managed Agents Budget Limit - `class BetaManagedAgentsBudgetLimit` A hard spend ceiling. The session stops issuing new model requests once the tracked list cost reaches `max_list_cost`. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. ### Beta Managed Agents Cache Creation Usage - `class BetaManagedAgentsCacheCreationUsage` Prompt-cache creation token usage broken down by cache lifetime. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 ### Beta Managed Agents Commit Checkout - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 ### Beta Managed Agents Deleted Session - `class BetaManagedAgentsDeletedSession` Confirmation that a `session` has been permanently deleted. - `type: Literal["session_deleted"]` - `id: str` ### Beta Managed Agents Delta Content - `class BetaManagedAgentsDeltaContent` - `type: Literal["content_delta"]` - `content: BetaManagedAgentsTextBlock` A partial element of the content array at index, typed like the element itself — the same shape the buffered agent.message carries in content. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `index: Optional[int]` Which entry in the previewed event's content array this fragment lands in. Insert content as that entry when the index is new; append to the existing entry otherwise. ### Beta Managed Agents Delta Event - `class BetaManagedAgentsDeltaEvent` An incremental update to an event that is still being streamed. Deltas are best-effort and may stop early; when the buffered event with id == event_id is produced it carries the complete content. A model request that ends early (an error or interrupt) produces no buffered event — its terminal span.model_request_end closes the preview. Only sent on stream connections that opt in via event_deltas; never appears in event history. - `type: Literal["event_delta"]` - `delta: BetaManagedAgentsDeltaContent` One fragment of the previewed event. The delta type is named for the previewed event's field it streams into: agent.message events stream content_delta fragments, each a partial element of the content array. - `type: Literal["content_delta"]` - `content: BetaManagedAgentsTextBlock` A partial element of the content array at index, typed like the element itself — the same shape the buffered agent.message carries in content. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `index: Optional[int]` Which entry in the previewed event's content array this fragment lands in. Insert content as that entry when the index is new; append to the existing entry otherwise. - `event_id: str` The id of the event being previewed. Matches event.id on the corresponding event_start and the buffered event that reconciles the preview. ### Beta Managed Agents Delta Type - `type BetaManagedAgentsDeltaType = Literal["agent.message", "agent.thinking"]` - `"agent.message"` - `"agent.thinking"` ### Beta Managed Agents File Resource Params - `class BetaManagedAgentsFileResourceParams` Mount a file uploaded via the Files API into the session. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1, maxLength: 128 - `mount_path: Optional[str]` Mount path in the container. Defaults to `/mnt/session/uploads/`. minLength: 1, maxLength: 4096 ### Beta Managed Agents GitHub Repository Resource Params - `class BetaManagedAgentsGitHubRepositoryResourceParams` Mount a GitHub repository into the session's container. - `type: Literal["github_repository"]` - `url: str` Github URL of the repository minLength: 1, maxLength: 2048 - `authorization_token: Optional[str]` GitHub authorization token used to clone the repository. Required for private repositories; optional for public ones. minLength: 1, maxLength: 4096 - `checkout: Optional[Checkout]` Branch or commit to check out. Defaults to the repository's default branch. - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 - `mount_path: Optional[str]` Mount path in the container. Defaults to `/workspace/`. minLength: 1, maxLength: 4096 ### Beta Managed Agents Memory Store Resource Param - `class BetaManagedAgentsMemoryStoreResourceParam` Parameters for attaching a memory store to an agent session. - `type: Literal["memory_store"]` - `memory_store_id: str` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `access: Optional[Literal["read_write", "read_only"]]` Access mode for the mounted store. Defaults to read_write. read_only mounts the store as a read-only filesystem. - `"read_write"` - `"read_only"` - `instructions: Optional[str]` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. maxLength: 4096 ### Beta Managed Agents Multiagent - `type BetaManagedAgentsMultiagent = ...` Resolved multiagent orchestration configuration as returned in API responses. - `class BetaManagedAgentsMultiagentCoordinator` Resolved coordinator topology with a concrete agent roster. - `type: Literal["coordinator"]` - `agents: List[Agent]` Agents the coordinator may spawn as session threads, each resolved to a specific version. - `class BetaManagedAgentsAgentReference` A resolved agent reference with a concrete version. - `type: Literal["agent"]` - `id: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagent20261001` Resolved multiagent configuration with three members, each enabled or disabled on its own. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsAgentReference]` Predefined agents, which are saved agents that this agent can spawn as session threads, each resolved to a specific version. - `type: Literal["agent"]` - `id: str` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsAgentReference]` Predefined agents, which are saved agents that a run's plan can use, each resolved to a specific version. - `type: Literal["agent"]` - `id: str` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` ### Beta Managed Agents Multiagent Params - `type BetaManagedAgentsMultiagentParams = ...` Multiagent orchestration configuration. - `class BetaManagedAgentsMultiagentCoordinatorParams` A coordinator topology: the session's primary thread orchestrates work by spawning session threads, each running an agent drawn from the `agents` roster. - `type: Literal["coordinator"]` - `agents: List[BetaManagedAgentsMultiagentRosterEntryParams]` Agents the coordinator may spawn as session threads. 1–20 entries. Each entry is an agent ID string, a versioned `{"type":"agent","id","version"}` reference, or `{"type":"self"}` to allow recursive self-invocation. Entries must reference distinct agents (after resolving `self` and string forms); at most one `self`. Referenced agents must exist, must not be archived, and must not themselves have `multiagent` set (depth limit 1). - `str` - `class BetaManagedAgentsAgentParams` Specification for an Agent. Provide a specific `version` or use the short-form `agent="agent_id"` for the most recent version - `type: Literal["agent"]` - `id: str` The `agent` ID. minLength: 1, maxLength: 128 - `version: Optional[int]` The specific `agent` version to use. Omit to use the latest version. Must be at least 1 if specified. format: int32 - `class BetaManagedAgentsMultiagentSelfParams` Sentinel roster entry meaning "the agent that owns this configuration". Resolved server-side to a concrete agent reference. - `type: Literal["self"]` - `class BetaManagedAgentsAdvisorParams` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. At most one per roster; the entry occupies the roster name `anthropic.advisor`. - `type: Literal["advisor"]` - `model: str` A Claude model id. The model must be permitted as an advisor for this agent's model. minLength: 1, maxLength: 256 - `class BetaManagedAgentsMultiagent20261001Params` Multiagent configuration with three members, each enabled or disabled on its own. On an update, if the agent's stored `multiagent` also has type `multiagent_20261001`, this configuration is merged into the stored one, level by level, instead of replacing it. A key that the update omits keeps its stored value. A key sent as null takes its default, on create as well, so `"workflows": null` enables workflows. An object sent with a `type` other than the stored one replaces the stored object, and the keys that it omits take their defaults. A `predefined_agents` list that is sent replaces the stored list. Every object that is sent needs its `type`, and an enabled `advisor` needs its `model`. Other validation applies to the merged result. - `type: Literal["multiagent_20261001"]` - `advisor: Optional[BetaManagedAgentsMultiagentAdvisorParams]` Whether the session's primary thread can consult an advisor model. Defaults to disabled. - `class BetaManagedAgentsMultiagentAdvisorEnabledParams` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` A Claude model id. The model must be permitted as an advisor for this agent's model. minLength: 1, maxLength: 256 - `class BetaManagedAgentsMultiagentAdvisorDisabledParams` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: Optional[BetaManagedAgentsMultiagentSubagentsParams]` Whether the agent can spawn session threads. Defaults to enabled. - `class BetaManagedAgentsMultiagentSubagentsEnabledParams` The agent can spawn session threads. Each thread runs a predefined agent, which is a saved agent in `predefined_agents`, or an inline agent, which the agent defines when it spawns the thread and which is not saved. If `inline_agents` is disabled, `predefined_agents` must name at least one agent. - `type: Literal["enabled"]` - `inline_agents: Optional[BetaManagedAgentsMultiagentInlineAgentsParams]` Whether the agent can define inline agents when it spawns session threads. Defaults to enabled. - `class BetaManagedAgentsMultiagentInlineAgentsEnabledParams` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabledParams` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: Optional[List[BetaManagedAgentsMultiagentPredefinedAgentParams]]` Predefined agents that this agent can spawn as session threads. At most 20. Defaults to null. Null and an empty list both mean no predefined agents. This list is separate from `workflows.predefined_agents`, and an agent in one list is not added to the other. - `str` - `class BetaManagedAgentsAgentParams` Specification for an Agent. Provide a specific `version` or use the short-form `agent="agent_id"` for the most recent version - `class BetaManagedAgentsMultiagentSelfParams` Sentinel roster entry meaning "the agent that owns this configuration". Resolved server-side to a concrete agent reference. - `class BetaManagedAgentsMultiagentSubagentsDisabledParams` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: Optional[BetaManagedAgentsMultiagentWorkflowsParams]` Whether the agent can start workflow runs. Defaults to enabled. - `class BetaManagedAgentsMultiagentWorkflowsEnabledParams` The agent can start workflow runs. Each run follows a plan, a program that the agent writes. A plan can use predefined agents, which are the saved agents in `predefined_agents`, and inline agents, which it defines itself and which are not saved. If `inline_agents` is disabled, `predefined_agents` must name at least one agent. - `type: Literal["enabled"]` - `inline_agents: Optional[BetaManagedAgentsMultiagentInlineAgentsParams]` Whether a run's plan can define inline agents. Defaults to enabled. - `predefined_agents: Optional[List[BetaManagedAgentsMultiagentPredefinedAgentParams]]` Predefined agents that a run's plan can use. At most 20. Defaults to null. Null and an empty list both mean no predefined agents. This list is separate from `subagents.predefined_agents`, and an agent in one list is not added to the other. - `str` - `class BetaManagedAgentsAgentParams` Specification for an Agent. Provide a specific `version` or use the short-form `agent="agent_id"` for the most recent version - `class BetaManagedAgentsMultiagentSelfParams` Sentinel roster entry meaning "the agent that owns this configuration". Resolved server-side to a concrete agent reference. - `class BetaManagedAgentsMultiagentWorkflowsDisabledParams` The agent cannot start workflow runs. - `type: Literal["disabled"]` ### Beta Managed Agents Multiagent Roster Entry Params - `type BetaManagedAgentsMultiagentRosterEntryParams = ...` An entry in a multiagent roster: an agent ID string, a versioned agent reference, or `self`. - `str` - `class BetaManagedAgentsAgentParams` Specification for an Agent. Provide a specific `version` or use the short-form `agent="agent_id"` for the most recent version - `type: Literal["agent"]` - `id: str` The `agent` ID. minLength: 1, maxLength: 128 - `version: Optional[int]` The specific `agent` version to use. Omit to use the latest version. Must be at least 1 if specified. format: int32 - `class BetaManagedAgentsMultiagentSelfParams` Sentinel roster entry meaning "the agent that owns this configuration". Resolved server-side to a concrete agent reference. - `type: Literal["self"]` - `class BetaManagedAgentsAdvisorParams` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. At most one per roster; the entry occupies the roster name `anthropic.advisor`. - `type: Literal["advisor"]` - `model: str` A Claude model id. The model must be permitted as an advisor for this agent's model. minLength: 1, maxLength: 256 ### Beta Managed Agents Outcome Evaluation Resource - `class BetaManagedAgentsOutcomeEvaluationResource` Evaluation state for a single outcome defined via a `define_outcome` event. - `type: Literal["outcome_evaluation"]` - `completed_at: Optional[datetime]` When the outcome reached a terminal result. Null while `pending`/`running`/`evaluating`. format: date-time - `description: str` What the agent should produce. - `explanation: Optional[str]` Grader's verdict text from the most recent evaluation. For `satisfied`, explains why criteria are met; for `needs_revision` (intermediate), what's missing; for `failed`, why unrecoverable. - `iteration: int` 0-indexed revision cycle the outcome is currently on. format: int32 - `outcome_id: str` Server-generated outc_ ID for this outcome. - `result: str` Current evaluation state. `pending` before the agent begins work; `running` while producing or revising; `evaluating` while the grader scores; `satisfied`/`max_iterations_reached`/`failed`/`interrupted` are terminal. ### Beta Managed Agents Server Tool Usage - `class BetaManagedAgentsServerToolUsage` Cumulative count of server-executed tool invocations, broken down by tool. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 ### Beta Managed Agents Session - `class BetaManagedAgentsSession` A Managed Agents `session`. - `type: Literal["session"]` - `id: str` - `agent: BetaManagedAgentsSessionAgent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 - `archived_at: Optional[datetime]` When the session was archived. Null if not archived. format: date-time - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's enforced spend ceiling, or null when no budget is set. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `environment_id: str` - `metadata: Dict[str, str]` - `outcome_evaluations: List[BetaManagedAgentsOutcomeEvaluationResource]` Per-outcome evaluation state. One entry per `define_outcome` event sent to the session. - `type: Literal["outcome_evaluation"]` - `completed_at: Optional[datetime]` When the outcome reached a terminal result. Null while `pending`/`running`/`evaluating`. format: date-time - `description: str` What the agent should produce. - `explanation: Optional[str]` Grader's verdict text from the most recent evaluation. For `satisfied`, explains why criteria are met; for `needs_revision` (intermediate), what's missing; for `failed`, why unrecoverable. - `iteration: int` 0-indexed revision cycle the outcome is currently on. format: int32 - `outcome_id: str` Server-generated outc_ ID for this outcome. - `result: str` Current evaluation state. `pending` before the agent begins work; `running` while producing or revising; `evaluating` while the grader scores; `satisfied`/`max_iterations_reached`/`failed`/`interrupted` are terminal. - `resources: List[BetaManagedAgentsSessionResource]` - `class BetaManagedAgentsGitHubRepositoryResource` - `type: Literal["github_repository"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `url: str` - `checkout: Optional[Checkout]` - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 - `class BetaManagedAgentsFileResource` - `type: Literal["file"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `file_id: str` - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `class BetaManagedAgentsMemoryStoreResource` A memory store attached to an agent session. - `type: Literal["memory_store"]` - `memory_store_id: str` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `access: Optional[Literal["read_write", "read_only"]]` Access mode for the mounted store. Defaults to `read_write`. `read_only` mounts the store as a read-only filesystem. - `"read_write"` - `"read_only"` - `description: Optional[str]` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `instructions: Optional[str]` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. maxLength: 4096 - `mount_path: Optional[str]` Filesystem path where the store is mounted in the session container, e.g. /mnt/memory/user-preferences. Derived from the store's name. Output-only. - `name: Optional[str]` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `stats: BetaManagedAgentsSessionStats` Timing statistics for the session. - `active_seconds: Optional[float]` Cumulative time in seconds the session spent in `running` status. Excludes idle time. format: double - `duration_seconds: Optional[float]` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. format: double - `status: Literal["rescheduling", "running", "idle", "terminated"]` - `"rescheduling"` Transient error occurred, retrying automatically. - `"running"` Agent is actively executing. - `"idle"` Agent is waiting for input, including user messages or tool confirmations. Sessions start in idle. - `"terminated"` Session has ended, either due to an error or completion. - `title: Optional[str]` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `usage: BetaManagedAgentsSessionUsage` Cumulative token usage for the session. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once, unlike `stats.active_seconds`, which sums each thread's own active time. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. Absent until cost tracking is available for the session. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. Absent until server-tool tracking is available for the session. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `vault_ids: List[str]` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `deployment_id: Optional[str]` Deployment ID when the session was created from a deployment reference. Null otherwise. ### Beta Managed Agents Session Agent - `class BetaManagedAgentsSessionAgent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 ### Beta Managed Agents Session Agent Update - `class BetaManagedAgentsSessionAgentUpdate` Mid-session agent configuration update. Only `tools` and `mcp_servers` are updatable. Full replacement: the provided array becomes the new value. To preserve existing entries, GET the session, modify the array, and POST it back. - `mcp_servers: Optional[List[BetaManagedAgentsURLMCPServerParams]]` Replacement MCP server list. Full replacement: the provided array becomes the new value. Send an empty array to clear; omit to preserve. - `type: Literal["url"]` - `name: str` Unique name for this server, referenced by mcp_toolset configurations. 1-255 characters. minLength: 1, maxLength: 255 - `url: str` Endpoint URL for the MCP server. maxLength: 2048 - `tools: Optional[List[Tool]]` Replacement tool list. Full replacement: the provided array becomes the new value. Send an empty array to clear; omit to preserve. - `class BetaManagedAgentsAgentToolset20260401Params` Configuration for built-in agent tools. Use this to enable or disable groups of tools available to the agent. - `type: Literal["agent_toolset_20260401"]` - `configs: Optional[List[BetaManagedAgentsAgentToolConfigParams]]` Per-tool configuration overrides. - `class BetaManagedAgentsBashToolConfigParams` Configuration override for the bash tool. - `type: Optional[Literal["bash"]]` - `name: Literal["bash"]` Must be "bash". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfigParams` Configuration override for the edit tool. - `type: Optional[Literal["edit"]]` - `name: Literal["edit"]` Must be "edit". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfigParams` Configuration override for the read tool. - `type: Optional[Literal["read"]]` - `name: Literal["read"]` Must be "read". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfigParams` Configuration override for the write tool. - `type: Optional[Literal["write"]]` - `name: Literal["write"]` Must be "write". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfigParams` Configuration override for the glob tool. - `type: Optional[Literal["glob"]]` - `name: Literal["glob"]` Must be "glob". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfigParams` Configuration override for the grep tool. - `type: Optional[Literal["grep"]]` - `name: Literal["grep"]` Must be "grep". - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfigParams` Configuration override for the web_fetch tool. - `type: Optional[Literal["web_fetch"]]` - `name: Literal["web_fetch"]` Must be "web_fetch". - `allowed_domains: Optional[List[str]]` Only fetch URLs whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "docs.example.com" (no scheme, port, or path). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with blocked_domains. - `blocked_domains: Optional[List[str]]` Never fetch URLs whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "ads.example.com" (no scheme, port, or path). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with allowed_domains. - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `max_content_tokens: Optional[int]` Maximum number of tokens of fetched text content to include in context per call. Does not apply to binary content such as PDFs. format: int32 - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSourcesParams]` Which sources contribute URLs the tool may fetch. Omit to allow every source. - `client_tool_results: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceToolFilter, null]]` Which custom tools' results contribute URLs that may be fetched: "all" (the default), "none", or an only or except list. Each name in a list must be a custom tool in the same tools array. - `Literal["all", "none"]` - `"all"` - `"none"` - `type BetaManagedAgentsWebFetchURLSourceToolFilter = ...` Which tools' results contribute URLs that may be fetched. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceToolFilter, null]]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched: "all" (the default), "none", or an only or except list. Each name in a list must be "web_search" or "web_fetch". - `user_input: Optional[Union[BetaManagedAgentsWebFetchURLSourceShorthand, BetaManagedAgentsWebFetchURLSourceUserInput, null]]` Whether URLs in the text of user messages may be fetched: "all" (the default) or "none". - `Literal["all", "none"]` - `"all"` - `"none"` - `type BetaManagedAgentsWebFetchURLSourceUserInput = ...` Whether URLs in the text of user messages may be fetched. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `class BetaManagedAgentsWebSearchToolConfigParams` Configuration override for the web_search tool. - `type: Optional[Literal["web_search"]]` - `name: Literal["web_search"]` Must be "web_search". - `allowed_domains: Optional[List[str]]` Only return search results whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "docs.example.com" (no scheme or port; an optional path suffix is accepted). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with blocked_domains. - `blocked_domains: Optional[List[str]]` Never return search results whose host is one of these domains or a subdomain of one. Each entry is a plain hostname like "ads.example.com" (no scheme or port; an optional path suffix is accepted). At most 64 entries; an empty list is rejected (omit the field instead). Cannot be combined with allowed_domains. - `enabled: Optional[bool]` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: Optional[BetaManagedAgentsAgentToolsetDefaultConfigParams]` Default configuration applied to all tools in this set. - `enabled: Optional[bool]` Whether tools are enabled and available to Claude by default. Defaults to true if not specified. - `permission_policy: Optional[PermissionPolicy]` Default permission policy for tools. Controls whether tool calls are auto-approved or require confirmation. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolsetParams` Configuration for tools from an MCP server defined in `mcp_servers`. - `type: Literal["mcp_toolset"]` - `mcp_server_name: str` Name of the MCP server. Must match a server name from the mcp_servers array. 1-255 characters. minLength: 1, maxLength: 255 - `configs: Optional[List[BetaManagedAgentsMCPToolConfigParams]]` Per-tool configuration overrides. - `name: str` Name of the MCP tool to configure. 1-128 characters. minLength: 1, maxLength: 128 - `enabled: Optional[bool]` Whether this tool is enabled. Overrides the `default_config` setting. - `permission_policy: Optional[PermissionPolicy]` Permission policy for this tool. Overrides the `default_config` setting. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: Optional[BetaManagedAgentsMCPToolsetDefaultConfigParams]` Default configuration for all tools from this server. - `enabled: Optional[bool]` Whether tools are enabled by default. Defaults to true if not specified. - `permission_policy: Optional[PermissionPolicy]` Default permission policy for tools from this server. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsCustomToolParams` A custom tool that is executed by the API client rather than the agent. When the agent calls this tool, an `agent.custom_tool_use` event is emitted and the session goes idle, waiting for the client to provide the result via a `user.custom_tool_result` event. - `type: Literal["custom"]` - `description: str` Description of what the tool does, shown to the agent to help it decide when to use the tool. minLength: 1 - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema defining the expected input parameters for the tool. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` Unique name for the tool. 1-128 characters; letters, digits, underscores, and hyphens. minLength: 1, maxLength: 128 ### Beta Managed Agents Session Multiagent - `type BetaManagedAgentsSessionMultiagent = ...` Resolved multiagent orchestration configuration as returned on a `session`. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` ### Beta Managed Agents Session Multiagent Coordinator - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. ### Beta Managed Agents Session Multiagent Subagents - `type BetaManagedAgentsSessionMultiagentSubagents = ...` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` ### Beta Managed Agents Session Multiagent Subagents Enabled - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 ### Beta Managed Agents Session Multiagent Workflows - `type BetaManagedAgentsSessionMultiagentWorkflows = ...` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` ### Beta Managed Agents Session Multiagent Workflows Enabled - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 ### Beta Managed Agents Session Multiagent20261001 - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` ### Beta Managed Agents Session Stats - `class BetaManagedAgentsSessionStats` Timing statistics for a session. - `active_seconds: Optional[float]` Cumulative time in seconds the session spent in `running` status. Excludes idle time. format: double - `duration_seconds: Optional[float]` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. format: double ### Beta Managed Agents Session Updated Event - `class BetaManagedAgentsSessionUpdatedEvent` Emitted when an UpdateSession request changed at least one field. Carries only the fields that changed; absent fields were not part of the update. The new configuration applies from the next turn. - `type: Literal["session.updated"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the update was applied. format: date-time - `agent: Optional[BetaManagedAgentsSessionAgent]` The session's effective agent configuration after the update. Present only when the update changed `agent` (tools or mcp_servers); when present it is the full materialised snapshot, not a diff. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's budget after the update: the new budget when set or replaced, or null when the update removed it. Present only when the update changed the budget. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `metadata: Optional[Dict[str, str]]` The session's full metadata bag after the update. Present when the update set non-empty metadata; absent when metadata was unchanged or cleared to empty. - `title: Optional[str]` The session's new title. Present only when the update changed it. ### Beta Managed Agents Session Usage - `class BetaManagedAgentsSessionUsage` Cumulative token usage for a session across all turns. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once, unlike `stats.active_seconds`, which sums each thread's own active time. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. Absent until cost tracking is available for the session. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. Absent until server-tool tracking is available for the session. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 ### Beta Managed Agents Session Usage Event - `class BetaManagedAgentsSessionUsageEvent` Periodic snapshot of the session's cumulative usage and tracked list cost. - `type: Literal["session.usage"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the snapshot was taken. format: date-time - `usage: BetaManagedAgentsSessionUsageSnapshot` The session's cumulative usage at the snapshot time. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's configured budget at the snapshot time, or null when the session has no budget. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. ### Beta Managed Agents Start Event - `class BetaManagedAgentsStartEvent` Opens a preview of a buffered event. Carries the previewed event's type and id only. Followed by zero or more event_delta events with the same event id, normally concluded by the buffered event carrying that id. If the producing model request ends without that event (an error or interrupt mid-stream), its terminal span.model_request_end closes the preview. Only sent on stream connections that opt in via event_deltas; never appears in event history. - `type: Literal["event_start"]` - `event: BetaManagedAgentsStartEventPreview` The previewed event's type and id. The event type determines which delta types the preview's event_delta events carry: agent.message events stream content_delta fragments; agent.thinking previews are start-only — no deltas follow, and the buffered agent.thinking with the same id concludes them. - `class BetaManagedAgentsAgentMessagePreview` - `type: Literal["agent.message"]` - `id: str` The id the buffered agent.message will carry if it is emitted. Matches the event_id on this preview's event_delta events. - `class BetaManagedAgentsAgentThinkingPreview` - `type: Literal["agent.thinking"]` - `id: str` The id the buffered agent.thinking will carry if it is emitted. Start-only — no event_delta events follow. ### Beta Managed Agents Start Event Preview - `type BetaManagedAgentsStartEventPreview = ...` - `class BetaManagedAgentsAgentMessagePreview` - `type: Literal["agent.message"]` - `id: str` The id the buffered agent.message will carry if it is emitted. Matches the event_id on this preview's event_delta events. - `class BetaManagedAgentsAgentThinkingPreview` - `type: Literal["agent.thinking"]` - `id: str` The id the buffered agent.thinking will carry if it is emitted. Start-only — no event_delta events follow. ### Beta Managed Agents System Content Block - `class BetaManagedAgentsSystemContentBlock` Content block in a mid-conversation system message. Text-only. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 ### Beta Managed Agents System Message Event - `class BetaManagedAgentsSystemMessageEvent` A mid-conversation system message event. Carries system-role content that is appended to the session as a `role: "system"` turn. - `type: Literal["system.message"]` - `id: str` Unique identifier for this event. - `content: List[BetaManagedAgentsSystemContentBlock]` System content blocks. Text-only. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `processed_at: Optional[datetime]` Timestamp when this system message was processed. format: date-time ### Beta Managed Agents User Tool Result Event - `class BetaManagedAgentsUserToolResultEvent` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `type: Literal["user.tool_result"]` - `id: str` Unique identifier for this event. - `tool_use_id: str` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `type: Literal["image"]` - `source: Source` The source of the image data. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `type: Literal["base64"]` - `data: str` Base64-encoded image data. minLength: 1 - `media_type: str` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). minLength: 1 - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: Literal["url"]` - `url: str` URL of the image to fetch. minLength: 1 - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type: Literal["document"]` - `source: Source` The source of the document data. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `type: Literal["base64"]` - `data: str` Base64-encoded document data. minLength: 1 - `media_type: str` MIME type of the document (e.g., "application/pdf"). minLength: 1 - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `type: Literal["text"]` - `data: str` The plain text content. minLength: 1 - `media_type: Literal["text/plain"]` MIME type of the text content. Must be "text/plain". - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: Literal["url"]` - `url: str` URL of the document to fetch. minLength: 1 - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `context: Optional[str]` Additional context about the document for the model. - `title: Optional[str]` The title of the document. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `type: Literal["search_result"]` - `citations: BetaManagedAgentsSearchResultCitations` Citation settings for this search result. - `enabled: bool` Whether citations are enabled for this search result. - `content: List[BetaManagedAgentsSearchResultContent]` Array of text content blocks from the search result. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `source: str` The URL source of the search result. minLength: 1 - `title: str` The title of the search result. minLength: 1 - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `processed_at: Optional[datetime]` Timestamp when this result was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. ## Sessions › Events ### List Events `beta.sessions.events.list(session_id, **kwargs) -> SyncPageCursor[BetaManagedAgentsSessionEvent]` **GET** `/v1/sessions/{session_id}/events` List Events #### Parameters - `session_id: str` (path parameter) - `created_at_gt: Optional[Union[str, datetime]]` (query parameter) Return events created after this time (exclusive). Compared against the event's `processed_at` value. format: date-time - `created_at_gte: Optional[Union[str, datetime]]` (query parameter) Return events created at or after this time (inclusive). Compared against the event's `processed_at` value. format: date-time - `created_at_lt: Optional[Union[str, datetime]]` (query parameter) Return events created before this time (exclusive). Compared against the event's `processed_at` value. format: date-time - `created_at_lte: Optional[Union[str, datetime]]` (query parameter) Return events created at or before this time (inclusive). Compared against the event's `processed_at` value. format: date-time - `limit: Optional[int]` (query parameter) format: int32 - `order: Optional[Literal["asc", "desc"]]` (query parameter) Sort direction for results, ordered by the event's `processed_at`. Defaults to `asc` (chronological). - `"asc"` - `"desc"` - `page: Optional[str]` (query parameter) Opaque pagination cursor from a previous response's `next_page`. - `types: Optional[List[BetaManagedAgentsSessionEventType]]` (query parameter) Filter by event type. Values match the `type` field on returned events (for example, `user.message` or `agent.tool_use`). Omit to return all event types. - `"user.message"` - `"user.interrupt"` - `"user.tool_confirmation"` - `"user.custom_tool_result"` - `"agent.custom_tool_use"` - `"agent.message"` - `"agent.thinking"` - `"agent.mcp_tool_use"` - `"agent.mcp_tool_result"` - `"agent.tool_use"` - `"agent.tool_result"` - `"agent.thread_message_received"` - `"agent.thread_message_sent"` - `"agent.thread_context_compacted"` - `"session.error"` - `"session.status_rescheduled"` - `"session.status_running"` - `"session.status_idle"` - `"session.status_terminated"` - `"session.thread_created"` - `"span.outcome_evaluation_start"` - `"span.outcome_evaluation_end"` - `"span.model_request_start"` - `"span.model_request_end"` - `"span.outcome_evaluation_ongoing"` - `"user.define_outcome"` - `"session.thread_status_running"` - `"session.thread_status_idle"` - `"session.thread_status_terminated"` - `"user.tool_result"` - `"session.thread_status_rescheduled"` - `"session.updated"` - `"system.message"` - `"session.usage"` - `"workflow_run.created"` - `"workflow_run.status_running"` - `"workflow_run.status_idle"` - `"workflow_run.status_ended"` - `"workflow_run.error"` - `"workflow_run.phase_started"` - `"workflow_run.phase_ended"` - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `type BetaManagedAgentsSessionEvent = ...` Union type for all event types in a session. - `class BetaManagedAgentsUserMessageEvent` A user message event in the session conversation. - `type: Literal["user.message"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock` Regular text content. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `type: Literal["image"]` - `source: Source` The source of the image data. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `type: Literal["base64"]` - `data: str` Base64-encoded image data. minLength: 1 - `media_type: str` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). minLength: 1 - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: Literal["url"]` - `url: str` URL of the image to fetch. minLength: 1 - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type: Literal["document"]` - `source: Source` The source of the document data. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `type: Literal["base64"]` - `data: str` Base64-encoded document data. minLength: 1 - `media_type: str` MIME type of the document (e.g., "application/pdf"). minLength: 1 - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `type: Literal["text"]` - `data: str` The plain text content. minLength: 1 - `media_type: Literal["text/plain"]` MIME type of the text content. Must be "text/plain". - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: Literal["url"]` - `url: str` URL of the document to fetch. minLength: 1 - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `context: Optional[str]` Additional context about the document for the model. - `title: Optional[str]` The title of the document. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `type: Literal["redacted"]` - `processed_at: Optional[datetime]` Timestamp when the agent finished processing this message. format: date-time - `class BetaManagedAgentsUserInterruptEvent` An interrupt event that pauses agent execution and returns control to the user. - `type: Literal["user.interrupt"]` - `id: str` Unique identifier for this event. - `processed_at: Optional[datetime]` Timestamp when the interrupt was processed. format: date-time - `session_thread_id: Optional[str]` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `class BetaManagedAgentsUserToolConfirmationEvent` A tool confirmation event that approves or denies a pending tool execution. - `type: Literal["user.tool_confirmation"]` - `id: str` Unique identifier for this event. - `result: Literal["allow", "deny"]` The confirmation result: 'allow' or 'deny'. - `"allow"` - `"deny"` - `tool_use_id: str` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `deny_message: Optional[str]` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. maxLength: 10000 - `processed_at: Optional[datetime]` Timestamp when the confirmation was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this confirmation was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsUserCustomToolResultEvent` Event sent by the client providing the result of a custom tool execution. - `type: Literal["user.custom_tool_result"]` - `id: str` Unique identifier for this event. - `custom_tool_use_id: str` The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `type: Literal["search_result"]` - `citations: BetaManagedAgentsSearchResultCitations` Citation settings for this search result. - `enabled: bool` Whether citations are enabled for this search result. - `content: List[BetaManagedAgentsSearchResultContent]` Array of text content blocks from the search result. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `source: str` The URL source of the search result. minLength: 1 - `title: str` The title of the search result. minLength: 1 - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `processed_at: Optional[datetime]` Timestamp when this result was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsAgentCustomToolUseEvent` Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result. The client can send it as soon as this event arrives, without waiting for `session.status_idle`. - `type: Literal["agent.custom_tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `name: str` Name of the custom tool being called. - `processed_at: datetime` Timestamp when this tool use was processed. format: date-time - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its custom tool use on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.custom_tool_result` by `custom_tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentMessageEvent` An agent response event in the session conversation. - `type: Literal["agent.message"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Array of text blocks comprising the agent response. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `processed_at: datetime` Timestamp when this response was generated. format: date-time - `class BetaManagedAgentsAgentThinkingEvent` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `type: Literal["agent.thinking"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this thinking was produced. format: date-time - `class BetaManagedAgentsAgentMCPToolUseEvent` Event emitted when the agent invokes a tool provided by an MCP server. - `type: Literal["agent.mcp_tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `mcp_server_name: str` Name of the MCP server providing the tool. - `name: str` Name of the MCP tool being used. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `evaluated_permission: Optional[BetaManagedAgentsAgentEvaluatedPermission]` The evaluated permission policy for this tool invocation. - `"allow"` - `"ask"` - `"deny"` - `evaluation: Optional[BetaManagedAgentsAgentToolEvaluation]` Which resolved permission_policy produced evaluated_permission: always_allow, always_ask, or auto (with the server's per-invocation judgement). Absent only when the server refused the call before any policy applied (for example, the named tool is not enabled in the session); such a refusal has evaluated_permission deny. An event recorded before this field existed reads as the arm its evaluated_permission implies (always_allow for allow, always_ask for ask). - `class BetaManagedAgentsAgentToolEvaluationAlwaysAllow` The resolved permission_policy was always_allow; accompanies evaluated_permission "allow". - `type: Literal["always_allow"]` - `class BetaManagedAgentsAgentToolEvaluationAlwaysAsk` The resolved permission_policy was always_ask; accompanies evaluated_permission "ask". - `type: Literal["always_ask"]` - `class BetaManagedAgentsAgentToolEvaluationAuto` The resolved permission_policy was auto: the server judged this invocation individually. - `type: Literal["auto"]` - `evaluated_permission: BetaManagedAgentsAgentAutoEvaluatedPermission` The server's judgement for this invocation. - `class BetaManagedAgentsAgentAutoEvaluatedPermissionAllow` The server judged the invocation safe to execute without client approval. - `type: Literal["allow"]` - `class BetaManagedAgentsAgentAutoEvaluatedPermissionAsk` The server reached no judgement; the invocation is held for client approval. - `type: Literal["ask"]` - `reason_code: str` The judgement's grounds in registry-bound terms, for client branching and audit rather than end-user display. Open registry; currently "indeterminate" (no judgement was reached). Clients must tolerate values outside this set. maxLength: 64 - `class BetaManagedAgentsAgentAutoEvaluatedPermissionDeny` The server judged the invocation high-risk; it does not execute and a synthetic error tool result is appended. - `type: Literal["deny"]` - `reason_code: str` The judgement's grounds in registry-bound terms. Open registry; currently "high_risk" (judged high-risk; the call does not run). Clients must tolerate values outside this set. maxLength: 64 - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.tool_confirmation` by `tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentMCPToolResultEvent` Event representing the result of an MCP tool execution. - `type: Literal["agent.mcp_tool_result"]` - `id: str` Unique identifier for this event. - `mcp_tool_use_id: str` The id of the `agent.mcp_tool_use` event this result corresponds to. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent` Event emitted when the agent invokes a built-in agent tool. - `type: Literal["agent.tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `name: str` Name of the agent tool being used. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `evaluated_permission: Optional[BetaManagedAgentsAgentEvaluatedPermission]` The evaluated permission policy for this tool invocation. - `evaluation: Optional[BetaManagedAgentsAgentToolEvaluation]` Which resolved permission_policy produced evaluated_permission: always_allow, always_ask, or auto (with the server's per-invocation judgement). Absent only when the server refused the call before any policy applied (for example, the named tool is not enabled in the session); such a refusal has evaluated_permission deny. An event recorded before this field existed reads as the arm its evaluated_permission implies (always_allow for allow, always_ask for ask). - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.tool_confirmation` or `user.tool_result` by `tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentToolResultEvent` Event representing the result of an agent tool execution. - `type: Literal["agent.tool_result"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `tool_use_id: str` The id of the `agent.tool_use` event this result corresponds to. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentThreadMessageReceivedEvent` Delivery event written to the target thread's input stream when an agent-to-agent message arrives. - `type: Literal["agent.thread_message_received"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Message content blocks. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `from_session_thread_id: str` Public `sthr_` ID of the thread that sent the message. - `processed_at: datetime` Timestamp when the message was received. format: date-time - `from_agent_name: Optional[str]` Name of the callable agent this message came from. Absent when received from the primary agent. - `class BetaManagedAgentsAgentThreadMessageSentEvent` Observability event emitted to the sender's output stream when an agent-to-agent message is sent. - `type: Literal["agent.thread_message_sent"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Message content blocks. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `processed_at: datetime` Timestamp when the message was sent. format: date-time - `to_session_thread_id: str` Public `sthr_` ID of the thread the message was sent to. - `to_agent_name: Optional[str]` Name of the callable agent this message was sent to. Absent when sent to the primary agent. - `class BetaManagedAgentsAgentThreadContextCompactedEvent` Indicates that context compaction (summarization) occurred during the session. - `type: Literal["agent.thread_context_compacted"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when compaction was processed. format: date-time - `class BetaManagedAgentsSessionErrorEvent` An error event indicating a problem occurred during session execution. - `type: Literal["session.error"]` - `id: str` Unique identifier for this event. - `error: Error` - `class BetaManagedAgentsUnknownError` An unknown or unexpected error occurred during session execution. A fallback variant; clients that don't recognize a new error code can match on `retry_status` and `message` alone. - `type: Literal["unknown_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `type: Literal["retrying"]` - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type: Literal["exhausted"]` - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `type: Literal["terminal"]` - `class BetaManagedAgentsModelOverloadedError` The model is currently overloaded. Emitted after automatic retries are exhausted. - `type: Literal["model_overloaded_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsModelRateLimitedError` The model request was rate-limited. - `type: Literal["model_rate_limited_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsModelRequestFailedError` A model request failed for a reason other than overload or rate-limiting. - `type: Literal["model_request_failed_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsMCPConnectionFailedError` Failed to connect to an MCP server. - `type: Literal["mcp_connection_failed_error"]` - `mcp_server_name: str` Name of the MCP server that failed to connect. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsMCPAuthenticationFailedError` Authentication to an MCP server failed. - `type: Literal["mcp_authentication_failed_error"]` - `mcp_server_name: str` Name of the MCP server that failed authentication. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsBillingError` The caller's organization or workspace cannot make model requests — out of credits or spend limit reached. Retrying with the same credentials will not succeed; the caller must resolve the billing state. - `type: Literal["billing_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsCredentialHostUnreachableError` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `type: Literal["credential_host_unreachable_error"]` - `credential_id: str` ID of the affected credential. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `vault_id: str` ID of the vault containing the affected credential. - `class BetaManagedAgentsRepositoryAuthenticationError` The repository host rejected the credentials, or required credentials and received none. - `type: Literal["repository_authentication_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryForbiddenError` The repository host refused access to the repository. - `type: Literal["repository_forbidden_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryNotFoundError` The repository host reported the repository as not found. - `type: Literal["repository_not_found_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryCheckoutError` The requested branch or commit does not exist in the repository. - `type: Literal["repository_checkout_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryCloneError` The repository could not be cloned. - `type: Literal["repository_clone_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `processed_at: datetime` Timestamp when the error occurred. format: date-time - `class BetaManagedAgentsSessionStatusRescheduledEvent` Indicates the session is recovering from an error state and is rescheduled for execution. - `type: Literal["session.status_rescheduled"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionStatusRunningEvent` Indicates the session is actively running and the agent is working. - `type: Literal["session.status_running"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionStatusIdleEvent` Indicates the agent has paused and is awaiting user input. - `type: Literal["session.status_idle"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `stop_details: Optional[BetaManagedAgentsSessionRefusalStopDetails]` Structured information about why the session stopped. `null` when there is nothing more to report. - `type: Literal["refusal"]` - `category: Optional[Literal["cyber", "bio", "frontier_llm", 2 more]]` The policy category that triggered the refusal, or `null` when there is no named category. New values can be added over time. - `"cyber"` - `"bio"` - `"frontier_llm"` - `"reasoning_extraction"` - `"general_harms"` - `explanation: Optional[str]` Human-readable explanation of the refusal, or `null` when none is available. The wording can change, so do not parse it. - `stop_reason: StopReason` - `class BetaManagedAgentsSessionEndTurn` The agent completed its turn naturally and is ready for the next user message. - `type: Literal["end_turn"]` - `class BetaManagedAgentsSessionRequiresAction` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `type: Literal["requires_action"]` - `event_ids: List[str]` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `class BetaManagedAgentsSessionRetriesExhausted` The turn ended because repeated errors exhausted the retry budget or an error escalated to `retry_status: 'exhausted'`. - `type: Literal["retries_exhausted"]` - `class BetaManagedAgentsSessionBudgetReached` The agent stopped because the session's tracked list cost reached its budget, or because its usage includes a model with no list price (which the budget cannot measure). Raise the budget to continue — or, if raising is rejected because a model has no list price, remove the budget. - `type: Literal["budget_reached"]` - `class BetaManagedAgentsSessionRefusal` The turn ended because the model's response was refused, for example by a safety classifier. - `type: Literal["refusal"]` - `class BetaManagedAgentsSessionStatusTerminatedEvent` Indicates the session has terminated, either due to an error or completion. - `type: Literal["session.status_terminated"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionThreadCreatedEvent` Emitted when a child thread is created. Written to the parent thread's output stream so clients observing the session see child creation. - `type: Literal["session.thread_created"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the callable agent the thread runs. - `processed_at: datetime` Timestamp when the thread was created. format: date-time - `session_thread_id: str` Public `sthr_` ID of the newly created thread. - `workflow_run_id: Optional[str]` Identifier of the workflow run that created the thread, or `null` for any other thread. - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent` Emitted when an outcome evaluation cycle begins. - `type: Literal["span.outcome_evaluation_start"]` - `id: str` Unique identifier for this event. - `iteration: int` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. format: int32 - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when outcome evaluation started. format: date-time - `class BetaManagedAgentsSpanOutcomeEvaluationEndEvent` Emitted when an outcome evaluation cycle completes. Carries the verdict and aggregate token usage. A verdict of `needs_revision` means another evaluation cycle follows; `satisfied`, `max_iterations_reached`, `failed`, or `interrupted` are terminal — no further evaluation cycles follow. - `type: Literal["span.outcome_evaluation_end"]` - `id: str` Unique identifier for this event. - `explanation: str` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `iteration: int` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. format: int32 - `outcome_evaluation_start_id: str` The id of the corresponding `span.outcome_evaluation_start` event. - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when outcome evaluation ended. format: date-time - `result: str` Evaluation verdict. 'satisfied': criteria met, session goes idle. 'needs_revision': criteria not met, another revision cycle follows. 'max_iterations_reached': evaluation budget exhausted with criteria still unmet — one final acknowledgment turn follows before the session goes idle, but no further evaluation runs. 'failed': grader determined the rubric does not apply to the deliverables. 'interrupted': user sent an interrupt while evaluation was in progress. - `usage: BetaManagedAgentsSpanModelUsage` Aggregate token usage for this evaluation cycle. Sums across all grader model requests within the cycle. - `cache_creation_input_tokens: int` Tokens used to create prompt cache in this request. format: int32 - `cache_read_input_tokens: int` Tokens read from prompt cache in this request. format: int32 - `input_tokens: int` Input tokens consumed by this request. format: int32 - `output_tokens: int` Output tokens generated by this request. format: int32 - `speed: Optional[Literal["standard", "fast"]]` Inference speed tier this request actually ran at. Mirrors `usage.speed` on /v1/messages. Only present when the fast-mode beta is active. - `"standard"` - `"fast"` - `class BetaManagedAgentsSpanModelRequestStartEvent` Emitted when a model request is initiated by the agent. - `type: Literal["span.model_request_start"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the model request started. format: date-time - `class BetaManagedAgentsSpanModelRequestEndEvent` Emitted when a model request completes. - `type: Literal["span.model_request_end"]` - `id: str` Unique identifier for this event. - `is_error: Optional[bool]` Whether the model request resulted in an error. - `model_request_start_id: str` The id of the corresponding `span.model_request_start` event. - `model_usage: BetaManagedAgentsSpanModelUsage` Token usage for this model request. - `processed_at: datetime` Timestamp when the model request completed. format: date-time - `class BetaManagedAgentsSpanOutcomeEvaluationOngoingEvent` Periodic heartbeat emitted while an outcome evaluation cycle is in progress. Distinguishes 'evaluation is actively running' from 'evaluation is stuck' between the corresponding `span.outcome_evaluation_start` and `span.outcome_evaluation_end` events. - `type: Literal["span.outcome_evaluation_ongoing"]` - `id: str` Unique identifier for this event. - `iteration: int` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. format: int32 - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when this heartbeat was emitted. format: date-time - `class BetaManagedAgentsUserDefineOutcomeEvent` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `type: Literal["user.define_outcome"]` - `id: str` Unique identifier for this event. - `description: str` What the agent should produce. Copied from the input event. - `max_iterations: Optional[int]` Evaluate-then-revise cycles before giving up. Default 3, max 20. format: int32 - `outcome_id: str` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `processed_at: datetime` Timestamp when the outcome was accepted. format: date-time - `rubric: Rubric` How to grade the outcome. File rubrics are currently resolved to their text content; clients should handle both variants. - `class BetaManagedAgentsFileRubric` Rubric referenced by a file uploaded via the Files API. - `type: Literal["file"]` - `file_id: str` ID of the rubric file. - `class BetaManagedAgentsTextRubric` Rubric content provided inline as text. - `type: Literal["text"]` - `content: str` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `class BetaManagedAgentsSessionDeletedEvent` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `type: Literal["session.deleted"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the session was deleted. format: date-time - `class BetaManagedAgentsSessionThreadStatusRunningEvent` A session thread has begun executing. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_running"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that started running. - `class BetaManagedAgentsSessionThreadStatusIdleEvent` A session thread has yielded and is awaiting input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_idle"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that went idle. - `stop_details: Optional[BetaManagedAgentsSessionRefusalStopDetails]` Structured information about why the thread stopped. `null` when there is nothing more to report. - `stop_reason: StopReason` - `class BetaManagedAgentsSessionEndTurn` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionRequiresAction` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `class BetaManagedAgentsSessionRetriesExhausted` The turn ended because repeated errors exhausted the retry budget or an error escalated to `retry_status: 'exhausted'`. - `class BetaManagedAgentsSessionBudgetReached` The agent stopped because the session's tracked list cost reached its budget, or because its usage includes a model with no list price (which the budget cannot measure). Raise the budget to continue — or, if raising is rejected because a model has no list price, remove the budget. - `class BetaManagedAgentsSessionRefusal` The turn ended because the model's response was refused, for example by a safety classifier. - `class BetaManagedAgentsSessionThreadStatusTerminatedEvent` A session thread has terminated and will accept no further input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_terminated"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that terminated. - `class BetaManagedAgentsUserToolResultEvent` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `type: Literal["user.tool_result"]` - `id: str` Unique identifier for this event. - `tool_use_id: str` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `processed_at: Optional[datetime]` Timestamp when this result was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsSessionThreadStatusRescheduledEvent` A session thread hit a transient error and is retrying automatically. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_rescheduled"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that is retrying. - `class BetaManagedAgentsSessionUpdatedEvent` Emitted when an UpdateSession request changed at least one field. Carries only the fields that changed; absent fields were not part of the update. The new configuration applies from the next turn. - `type: Literal["session.updated"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the update was applied. format: date-time - `agent: Optional[BetaManagedAgentsSessionAgent]` The session's effective agent configuration after the update. Present only when the update changed `agent` (tools or mcp_servers); when present it is the full materialised snapshot, not a diff. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's budget after the update: the new budget when set or replaced, or null when the update removed it. Present only when the update changed the budget. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `metadata: Optional[Dict[str, str]]` The session's full metadata bag after the update. Present when the update set non-empty metadata; absent when metadata was unchanged or cleared to empty. - `title: Optional[str]` The session's new title. Present only when the update changed it. - `class BetaManagedAgentsSystemMessageEvent` A mid-conversation system message event. Carries system-role content that is appended to the session as a `role: "system"` turn. - `type: Literal["system.message"]` - `id: str` Unique identifier for this event. - `content: List[BetaManagedAgentsSystemContentBlock]` System content blocks. Text-only. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `processed_at: Optional[datetime]` Timestamp when this system message was processed. format: date-time - `class BetaManagedAgentsSessionUsageEvent` Periodic snapshot of the session's cumulative usage and tracked list cost. - `type: Literal["session.usage"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the snapshot was taken. format: date-time - `usage: BetaManagedAgentsSessionUsageSnapshot` The session's cumulative usage at the snapshot time. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's configured budget at the snapshot time, or null when the session has no budget. - `class BetaManagedAgentsWorkflowRunCreatedEvent` A workflow run was created. A workflow run is background work that the session's agent starts. Emitted once per run, before the run's other `workflow_run.*` events. - `type: Literal["workflow_run.created"]` - `id: str` Unique identifier for this event. - `description: Optional[str]` Description that the agent gave the run, passed on as written, or `null` if it gave none. - `name: str` Name that the agent gave the run, passed on as written, or a name that the server assigned. - `phases: List[BetaManagedAgentsWorkflowRunPhase]` The phases that the run's plan declares, in the plan's order. Can be empty. - `id: str` Unique identifier for the phase. - `description: Optional[str]` Description that the agent gave the phase, passed on as written, or `null` if it gave none. - `name: str` Name that the agent gave the phase, passed on as written. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunStatusEndedEvent` A workflow run ended. Emitted once per run, as the last of the run's `workflow_run.*` events. - `type: Literal["workflow_run.status_ended"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `result: BetaManagedAgentsWorkflowRunResult` How the run ended. - `class BetaManagedAgentsWorkflowRunResultCompleted` The run's plan, a program that the agent wrote, finished. This does not say whether the work succeeded. - `type: Literal["completed"]` - `class BetaManagedAgentsWorkflowRunResultError` The run failed or reached its time limit. - `type: Literal["error"]` - `error: BetaManagedAgentsWorkflowRunError` Why the run did not finish. - `class BetaManagedAgentsTimeoutWorkflowRunError` The run reached its time limit. - `type: Literal["timeout_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsProgramWorkflowRunError` The plan, a program that the agent wrote, failed, or the server refused it. - `type: Literal["program_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsUnknownWorkflowRunError` A failure that has no type of its own. - `type: Literal["unknown_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsThreadLimitWorkflowRunError` The run exceeded the limit on the number of threads that a run can create. - `type: Literal["thread_limit_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsMaxWorkflowRunsWorkflowRunError` No run was created, because the session was at its limit of open workflow runs, which are runs that have not ended. Only `workflow_run.error` carries this type. - `type: Literal["max_workflow_runs_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsWorkflowRunResultStopped` The agent stopped the run. - `type: Literal["stopped"]` - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunPhaseStartedEvent` A workflow run's plan entered a phase. - `type: Literal["workflow_run.phase_started"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `workflow_run_phase_id: str` Identifier of the phase, as in `phases` on the run's `workflow_run.created` event. - `class BetaManagedAgentsWorkflowRunPhaseEndedEvent` A workflow run's plan left a phase, or the run's end closed it. Emitted once for every `workflow_run.phase_started` event, before the run's `workflow_run.status_ended` event. The event does not say whether the plan finished the phase's work, or why it left. - `type: Literal["workflow_run.phase_ended"]` - `id: str` Unique identifier for this event. - `phase_started_id: str` Identifier of the `workflow_run.phase_started` event that opened the phase. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `workflow_run_phase_id: str` Identifier of the phase, as in `phases` on the run's `workflow_run.created` event. - `class BetaManagedAgentsWorkflowRunStatusRunningEvent` A workflow run is running. Emitted when the run starts to execute, and each time it resumes after being idle. A run that starts idle emits `workflow_run.status_idle` first. - `type: Literal["workflow_run.status_running"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunStatusIdleEvent` A workflow run is idle. Emitted each time the run goes idle, whatever the cause. If the run ends while idle, no `workflow_run.status_running` comes between this event and its `workflow_run.status_ended`. - `type: Literal["workflow_run.status_idle"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunErrorEvent` A workflow run met an error, or an error kept a run from being created. A run that ends with a `result.type` of `error` emits this event before its `workflow_run.status_ended`, with the same `error`. - `type: Literal["workflow_run.error"]` - `id: str` Unique identifier for this event. - `error: BetaManagedAgentsWorkflowRunError` Why the run did not finish, or was not created. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: Optional[str]` Identifier of the run that met the error, or `null` when the error kept a run from being created. #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) page = client.beta.sessions.events.list( session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) page = page.data[0] print(page) ``` ##### Response (200) ```json { "data": [ { "id": "sevt_011CZkZGPp1iBcp4kaQSihUm", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" }, { "id": "sevt_011CZkZHPq1jCdq5mbRTjiVn", "content": [ { "text": "Let me look up order #1234 for you.", "type": "text" } ], "processed_at": "2026-03-15T10:00:00Z", "type": "agent.message" } ], "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo=" } ``` ### Send Events `beta.sessions.events.send(session_id, **kwargs) -> BetaManagedAgentsSendSessionEvents` **POST** `/v1/sessions/{session_id}/events` Send Events #### Parameters - `session_id: str` (path parameter) - `events: Iterable[BetaManagedAgentsEventParams]` Events to send to the `session`. - `class BetaManagedAgentsUserMessageEventParams` Parameters for sending a user message to the session. - `type: Literal["user.message"]` - `content: Iterable[Content]` Array of content blocks for the user message. - `class BetaManagedAgentsTextBlock` Regular text content. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `type: Literal["image"]` - `source: Source` The source of the image data. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `type: Literal["base64"]` - `data: str` Base64-encoded image data. minLength: 1 - `media_type: str` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). minLength: 1 - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: Literal["url"]` - `url: str` URL of the image to fetch. minLength: 1 - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type: Literal["document"]` - `source: Source` The source of the document data. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `type: Literal["base64"]` - `data: str` Base64-encoded document data. minLength: 1 - `media_type: str` MIME type of the document (e.g., "application/pdf"). minLength: 1 - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `type: Literal["text"]` - `data: str` The plain text content. minLength: 1 - `media_type: Literal["text/plain"]` MIME type of the text content. Must be "text/plain". - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: Literal["url"]` - `url: str` URL of the document to fetch. minLength: 1 - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `context: Optional[str]` Additional context about the document for the model. - `title: Optional[str]` The title of the document. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `type: Literal["redacted"]` - `class BetaManagedAgentsUserInterruptEventParams` Parameters for sending an interrupt to pause the agent. - `type: Literal["user.interrupt"]` - `session_thread_id: Optional[str]` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `class BetaManagedAgentsUserToolConfirmationEventParams` Parameters for confirming or denying a tool execution request. - `type: Literal["user.tool_confirmation"]` - `result: Literal["allow", "deny"]` The confirmation result: 'allow' or 'deny'. - `"allow"` - `"deny"` - `tool_use_id: str` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. minLength: 1, maxLength: 128 - `deny_message: Optional[str]` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. maxLength: 10000 - `class BetaManagedAgentsUserCustomToolResultEventParams` Parameters for providing the result of a custom tool execution. - `type: Literal["user.custom_tool_result"]` - `custom_tool_use_id: str` The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. minLength: 1, maxLength: 128 - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `type: Literal["search_result"]` - `citations: BetaManagedAgentsSearchResultCitations` Citation settings for this search result. - `enabled: bool` Whether citations are enabled for this search result. - `content: List[BetaManagedAgentsSearchResultContent]` Array of text content blocks from the search result. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `source: str` The URL source of the search result. minLength: 1 - `title: str` The title of the search result. minLength: 1 - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `class BetaManagedAgentsUserDefineOutcomeEventParams` Parameters for defining an outcome the agent should work toward. The agent begins work on receipt. - `type: Literal["user.define_outcome"]` - `description: str` What the agent should produce. This is the task specification. - `rubric: Rubric` How to grade the outcome. Text or file reference. - `class BetaManagedAgentsFileRubricParams` Rubric referenced by a file uploaded via the Files API. - `type: Literal["file"]` - `file_id: str` ID of the rubric file. - `class BetaManagedAgentsTextRubricParams` Rubric content provided inline as text. - `type: Literal["text"]` - `content: str` Rubric content. Plain text or markdown — the grader treats it as freeform text. Maximum 262144 characters. maxLength: 262144 - `max_iterations: Optional[int]` Eval→revision cycles before giving up. Default 3, max 20. format: int32 - `class BetaManagedAgentsUserToolResultEventParams` Parameters for providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `type: Literal["user.tool_result"]` - `tool_use_id: str` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. minLength: 1, maxLength: 128 - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `class BetaManagedAgentsSystemMessageEventParams` Privileged context for the accompanying turn and all subsequent turns, appended to the session's system context as a `role: "system"` turn rather than replacing the top-level system prompt. At most one per request: it must be the final event and immediately follow the `user.message`, `user.tool_result`, or `user.custom_tool_result` it accompanies. Only supported on models that accept mid-conversation system messages. - `type: Literal["system.message"]` - `content: List[BetaManagedAgentsSystemContentBlock]` System content blocks to append. Text-only. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `class BetaManagedAgentsSendSessionEvents` Events that were successfully sent to the session. - `data: Optional[List[Data]]` Sent events - `class BetaManagedAgentsUserMessageEvent` A user message event in the session conversation. - `type: Literal["user.message"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock` Regular text content. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `type: Literal["image"]` - `source: Source` The source of the image data. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `type: Literal["base64"]` - `data: str` Base64-encoded image data. minLength: 1 - `media_type: str` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). minLength: 1 - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: Literal["url"]` - `url: str` URL of the image to fetch. minLength: 1 - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type: Literal["document"]` - `source: Source` The source of the document data. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `type: Literal["base64"]` - `data: str` Base64-encoded document data. minLength: 1 - `media_type: str` MIME type of the document (e.g., "application/pdf"). minLength: 1 - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `type: Literal["text"]` - `data: str` The plain text content. minLength: 1 - `media_type: Literal["text/plain"]` MIME type of the text content. Must be "text/plain". - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: Literal["url"]` - `url: str` URL of the document to fetch. minLength: 1 - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `context: Optional[str]` Additional context about the document for the model. - `title: Optional[str]` The title of the document. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `type: Literal["redacted"]` - `processed_at: Optional[datetime]` Timestamp when the agent finished processing this message. format: date-time - `class BetaManagedAgentsUserInterruptEvent` An interrupt event that pauses agent execution and returns control to the user. - `type: Literal["user.interrupt"]` - `id: str` Unique identifier for this event. - `processed_at: Optional[datetime]` Timestamp when the interrupt was processed. format: date-time - `session_thread_id: Optional[str]` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `class BetaManagedAgentsUserToolConfirmationEvent` A tool confirmation event that approves or denies a pending tool execution. - `type: Literal["user.tool_confirmation"]` - `id: str` Unique identifier for this event. - `result: Literal["allow", "deny"]` The confirmation result: 'allow' or 'deny'. - `"allow"` - `"deny"` - `tool_use_id: str` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `deny_message: Optional[str]` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. maxLength: 10000 - `processed_at: Optional[datetime]` Timestamp when the confirmation was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this confirmation was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsUserCustomToolResultEvent` Event sent by the client providing the result of a custom tool execution. - `type: Literal["user.custom_tool_result"]` - `id: str` Unique identifier for this event. - `custom_tool_use_id: str` The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `type: Literal["search_result"]` - `citations: BetaManagedAgentsSearchResultCitations` Citation settings for this search result. - `enabled: bool` Whether citations are enabled for this search result. - `content: List[BetaManagedAgentsSearchResultContent]` Array of text content blocks from the search result. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `source: str` The URL source of the search result. minLength: 1 - `title: str` The title of the search result. minLength: 1 - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `processed_at: Optional[datetime]` Timestamp when this result was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsUserDefineOutcomeEvent` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `type: Literal["user.define_outcome"]` - `id: str` Unique identifier for this event. - `description: str` What the agent should produce. Copied from the input event. - `max_iterations: Optional[int]` Evaluate-then-revise cycles before giving up. Default 3, max 20. format: int32 - `outcome_id: str` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `processed_at: datetime` Timestamp when the outcome was accepted. format: date-time - `rubric: Rubric` How to grade the outcome. File rubrics are currently resolved to their text content; clients should handle both variants. - `class BetaManagedAgentsFileRubric` Rubric referenced by a file uploaded via the Files API. - `type: Literal["file"]` - `file_id: str` ID of the rubric file. - `class BetaManagedAgentsTextRubric` Rubric content provided inline as text. - `type: Literal["text"]` - `content: str` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `class BetaManagedAgentsUserToolResultEvent` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `type: Literal["user.tool_result"]` - `id: str` Unique identifier for this event. - `tool_use_id: str` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `processed_at: Optional[datetime]` Timestamp when this result was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsSystemMessageEvent` A mid-conversation system message event. Carries system-role content that is appended to the session as a `role: "system"` turn. - `type: Literal["system.message"]` - `id: str` Unique identifier for this event. - `content: List[BetaManagedAgentsSystemContentBlock]` System content blocks. Text-only. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `processed_at: Optional[datetime]` Timestamp when this system message was processed. format: date-time #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) beta_managed_agents_send_session_events = client.beta.sessions.events.send( session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", events=[ { "content": [ { "text": "Where is my order #1234?", "type": "text", } ], "type": "user.message", } ], ) print(beta_managed_agents_send_session_events.data) ``` ##### Response (200) ```json { "data": [ { "id": "sevt_011CZkZGPp1iBcp4kaQSihUm", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ] } ``` ### Stream Events `beta.sessions.events.stream(session_id, **kwargs) -> BetaManagedAgentsStreamSessionEvents` **GET** `/v1/sessions/{session_id}/events/stream` Stream Events #### Parameters - `session_id: str` (path parameter) - `event_deltas: Optional[List[BetaManagedAgentsDeltaType]]` (query parameter) When set, this connection also receives streaming deltas (`event_start`, `event_delta`) while an event is being produced, before the event itself arrives. Deltas are best-effort; when the final event is produced it carries the complete content. A model request that ends early (an error or interrupt) produces no final event — its terminal `span.model_request_end` closes the preview. Accepts one or more event types to preview and may be repeated: `agent.message` streams `content_delta` fragments; `agent.thinking` is start-only — a signal that the agent has begun extended thinking, concluded by the `agent.thinking` event itself. Only previews of the requested event types are sent. - `"agent.message"` - `"agent.thinking"` - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `type BetaManagedAgentsStreamSessionEvents = ...` Server-sent event in the session stream. - `class BetaManagedAgentsUserMessageEvent` A user message event in the session conversation. - `type: Literal["user.message"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock` Regular text content. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `type: Literal["image"]` - `source: Source` The source of the image data. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `type: Literal["base64"]` - `data: str` Base64-encoded image data. minLength: 1 - `media_type: str` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). minLength: 1 - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: Literal["url"]` - `url: str` URL of the image to fetch. minLength: 1 - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type: Literal["document"]` - `source: Source` The source of the document data. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `type: Literal["base64"]` - `data: str` Base64-encoded document data. minLength: 1 - `media_type: str` MIME type of the document (e.g., "application/pdf"). minLength: 1 - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `type: Literal["text"]` - `data: str` The plain text content. minLength: 1 - `media_type: Literal["text/plain"]` MIME type of the text content. Must be "text/plain". - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: Literal["url"]` - `url: str` URL of the document to fetch. minLength: 1 - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `context: Optional[str]` Additional context about the document for the model. - `title: Optional[str]` The title of the document. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `type: Literal["redacted"]` - `processed_at: Optional[datetime]` Timestamp when the agent finished processing this message. format: date-time - `class BetaManagedAgentsUserInterruptEvent` An interrupt event that pauses agent execution and returns control to the user. - `type: Literal["user.interrupt"]` - `id: str` Unique identifier for this event. - `processed_at: Optional[datetime]` Timestamp when the interrupt was processed. format: date-time - `session_thread_id: Optional[str]` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `class BetaManagedAgentsUserToolConfirmationEvent` A tool confirmation event that approves or denies a pending tool execution. - `type: Literal["user.tool_confirmation"]` - `id: str` Unique identifier for this event. - `result: Literal["allow", "deny"]` The confirmation result: 'allow' or 'deny'. - `"allow"` - `"deny"` - `tool_use_id: str` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `deny_message: Optional[str]` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. maxLength: 10000 - `processed_at: Optional[datetime]` Timestamp when the confirmation was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this confirmation was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsUserCustomToolResultEvent` Event sent by the client providing the result of a custom tool execution. - `type: Literal["user.custom_tool_result"]` - `id: str` Unique identifier for this event. - `custom_tool_use_id: str` The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `type: Literal["search_result"]` - `citations: BetaManagedAgentsSearchResultCitations` Citation settings for this search result. - `enabled: bool` Whether citations are enabled for this search result. - `content: List[BetaManagedAgentsSearchResultContent]` Array of text content blocks from the search result. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `source: str` The URL source of the search result. minLength: 1 - `title: str` The title of the search result. minLength: 1 - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `processed_at: Optional[datetime]` Timestamp when this result was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsAgentCustomToolUseEvent` Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result. The client can send it as soon as this event arrives, without waiting for `session.status_idle`. - `type: Literal["agent.custom_tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `name: str` Name of the custom tool being called. - `processed_at: datetime` Timestamp when this tool use was processed. format: date-time - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its custom tool use on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.custom_tool_result` by `custom_tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentMessageEvent` An agent response event in the session conversation. - `type: Literal["agent.message"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Array of text blocks comprising the agent response. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `processed_at: datetime` Timestamp when this response was generated. format: date-time - `class BetaManagedAgentsAgentThinkingEvent` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `type: Literal["agent.thinking"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this thinking was produced. format: date-time - `class BetaManagedAgentsAgentMCPToolUseEvent` Event emitted when the agent invokes a tool provided by an MCP server. - `type: Literal["agent.mcp_tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `mcp_server_name: str` Name of the MCP server providing the tool. - `name: str` Name of the MCP tool being used. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `evaluated_permission: Optional[BetaManagedAgentsAgentEvaluatedPermission]` The evaluated permission policy for this tool invocation. - `"allow"` - `"ask"` - `"deny"` - `evaluation: Optional[BetaManagedAgentsAgentToolEvaluation]` Which resolved permission_policy produced evaluated_permission: always_allow, always_ask, or auto (with the server's per-invocation judgement). Absent only when the server refused the call before any policy applied (for example, the named tool is not enabled in the session); such a refusal has evaluated_permission deny. An event recorded before this field existed reads as the arm its evaluated_permission implies (always_allow for allow, always_ask for ask). - `class BetaManagedAgentsAgentToolEvaluationAlwaysAllow` The resolved permission_policy was always_allow; accompanies evaluated_permission "allow". - `type: Literal["always_allow"]` - `class BetaManagedAgentsAgentToolEvaluationAlwaysAsk` The resolved permission_policy was always_ask; accompanies evaluated_permission "ask". - `type: Literal["always_ask"]` - `class BetaManagedAgentsAgentToolEvaluationAuto` The resolved permission_policy was auto: the server judged this invocation individually. - `type: Literal["auto"]` - `evaluated_permission: BetaManagedAgentsAgentAutoEvaluatedPermission` The server's judgement for this invocation. - `class BetaManagedAgentsAgentAutoEvaluatedPermissionAllow` The server judged the invocation safe to execute without client approval. - `type: Literal["allow"]` - `class BetaManagedAgentsAgentAutoEvaluatedPermissionAsk` The server reached no judgement; the invocation is held for client approval. - `type: Literal["ask"]` - `reason_code: str` The judgement's grounds in registry-bound terms, for client branching and audit rather than end-user display. Open registry; currently "indeterminate" (no judgement was reached). Clients must tolerate values outside this set. maxLength: 64 - `class BetaManagedAgentsAgentAutoEvaluatedPermissionDeny` The server judged the invocation high-risk; it does not execute and a synthetic error tool result is appended. - `type: Literal["deny"]` - `reason_code: str` The judgement's grounds in registry-bound terms. Open registry; currently "high_risk" (judged high-risk; the call does not run). Clients must tolerate values outside this set. maxLength: 64 - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.tool_confirmation` by `tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentMCPToolResultEvent` Event representing the result of an MCP tool execution. - `type: Literal["agent.mcp_tool_result"]` - `id: str` Unique identifier for this event. - `mcp_tool_use_id: str` The id of the `agent.mcp_tool_use` event this result corresponds to. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent` Event emitted when the agent invokes a built-in agent tool. - `type: Literal["agent.tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `name: str` Name of the agent tool being used. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `evaluated_permission: Optional[BetaManagedAgentsAgentEvaluatedPermission]` The evaluated permission policy for this tool invocation. - `evaluation: Optional[BetaManagedAgentsAgentToolEvaluation]` Which resolved permission_policy produced evaluated_permission: always_allow, always_ask, or auto (with the server's per-invocation judgement). Absent only when the server refused the call before any policy applied (for example, the named tool is not enabled in the session); such a refusal has evaluated_permission deny. An event recorded before this field existed reads as the arm its evaluated_permission implies (always_allow for allow, always_ask for ask). - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.tool_confirmation` or `user.tool_result` by `tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentToolResultEvent` Event representing the result of an agent tool execution. - `type: Literal["agent.tool_result"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `tool_use_id: str` The id of the `agent.tool_use` event this result corresponds to. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentThreadMessageReceivedEvent` Delivery event written to the target thread's input stream when an agent-to-agent message arrives. - `type: Literal["agent.thread_message_received"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Message content blocks. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `from_session_thread_id: str` Public `sthr_` ID of the thread that sent the message. - `processed_at: datetime` Timestamp when the message was received. format: date-time - `from_agent_name: Optional[str]` Name of the callable agent this message came from. Absent when received from the primary agent. - `class BetaManagedAgentsAgentThreadMessageSentEvent` Observability event emitted to the sender's output stream when an agent-to-agent message is sent. - `type: Literal["agent.thread_message_sent"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Message content blocks. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `processed_at: datetime` Timestamp when the message was sent. format: date-time - `to_session_thread_id: str` Public `sthr_` ID of the thread the message was sent to. - `to_agent_name: Optional[str]` Name of the callable agent this message was sent to. Absent when sent to the primary agent. - `class BetaManagedAgentsAgentThreadContextCompactedEvent` Indicates that context compaction (summarization) occurred during the session. - `type: Literal["agent.thread_context_compacted"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when compaction was processed. format: date-time - `class BetaManagedAgentsSessionErrorEvent` An error event indicating a problem occurred during session execution. - `type: Literal["session.error"]` - `id: str` Unique identifier for this event. - `error: Error` - `class BetaManagedAgentsUnknownError` An unknown or unexpected error occurred during session execution. A fallback variant; clients that don't recognize a new error code can match on `retry_status` and `message` alone. - `type: Literal["unknown_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `type: Literal["retrying"]` - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type: Literal["exhausted"]` - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `type: Literal["terminal"]` - `class BetaManagedAgentsModelOverloadedError` The model is currently overloaded. Emitted after automatic retries are exhausted. - `type: Literal["model_overloaded_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsModelRateLimitedError` The model request was rate-limited. - `type: Literal["model_rate_limited_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsModelRequestFailedError` A model request failed for a reason other than overload or rate-limiting. - `type: Literal["model_request_failed_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsMCPConnectionFailedError` Failed to connect to an MCP server. - `type: Literal["mcp_connection_failed_error"]` - `mcp_server_name: str` Name of the MCP server that failed to connect. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsMCPAuthenticationFailedError` Authentication to an MCP server failed. - `type: Literal["mcp_authentication_failed_error"]` - `mcp_server_name: str` Name of the MCP server that failed authentication. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsBillingError` The caller's organization or workspace cannot make model requests — out of credits or spend limit reached. Retrying with the same credentials will not succeed; the caller must resolve the billing state. - `type: Literal["billing_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsCredentialHostUnreachableError` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `type: Literal["credential_host_unreachable_error"]` - `credential_id: str` ID of the affected credential. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `vault_id: str` ID of the vault containing the affected credential. - `class BetaManagedAgentsRepositoryAuthenticationError` The repository host rejected the credentials, or required credentials and received none. - `type: Literal["repository_authentication_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryForbiddenError` The repository host refused access to the repository. - `type: Literal["repository_forbidden_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryNotFoundError` The repository host reported the repository as not found. - `type: Literal["repository_not_found_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryCheckoutError` The requested branch or commit does not exist in the repository. - `type: Literal["repository_checkout_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryCloneError` The repository could not be cloned. - `type: Literal["repository_clone_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `processed_at: datetime` Timestamp when the error occurred. format: date-time - `class BetaManagedAgentsSessionStatusRescheduledEvent` Indicates the session is recovering from an error state and is rescheduled for execution. - `type: Literal["session.status_rescheduled"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionStatusRunningEvent` Indicates the session is actively running and the agent is working. - `type: Literal["session.status_running"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionStatusIdleEvent` Indicates the agent has paused and is awaiting user input. - `type: Literal["session.status_idle"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `stop_details: Optional[BetaManagedAgentsSessionRefusalStopDetails]` Structured information about why the session stopped. `null` when there is nothing more to report. - `type: Literal["refusal"]` - `category: Optional[Literal["cyber", "bio", "frontier_llm", 2 more]]` The policy category that triggered the refusal, or `null` when there is no named category. New values can be added over time. - `"cyber"` - `"bio"` - `"frontier_llm"` - `"reasoning_extraction"` - `"general_harms"` - `explanation: Optional[str]` Human-readable explanation of the refusal, or `null` when none is available. The wording can change, so do not parse it. - `stop_reason: StopReason` - `class BetaManagedAgentsSessionEndTurn` The agent completed its turn naturally and is ready for the next user message. - `type: Literal["end_turn"]` - `class BetaManagedAgentsSessionRequiresAction` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `type: Literal["requires_action"]` - `event_ids: List[str]` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `class BetaManagedAgentsSessionRetriesExhausted` The turn ended because repeated errors exhausted the retry budget or an error escalated to `retry_status: 'exhausted'`. - `type: Literal["retries_exhausted"]` - `class BetaManagedAgentsSessionBudgetReached` The agent stopped because the session's tracked list cost reached its budget, or because its usage includes a model with no list price (which the budget cannot measure). Raise the budget to continue — or, if raising is rejected because a model has no list price, remove the budget. - `type: Literal["budget_reached"]` - `class BetaManagedAgentsSessionRefusal` The turn ended because the model's response was refused, for example by a safety classifier. - `type: Literal["refusal"]` - `class BetaManagedAgentsSessionStatusTerminatedEvent` Indicates the session has terminated, either due to an error or completion. - `type: Literal["session.status_terminated"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionThreadCreatedEvent` Emitted when a child thread is created. Written to the parent thread's output stream so clients observing the session see child creation. - `type: Literal["session.thread_created"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the callable agent the thread runs. - `processed_at: datetime` Timestamp when the thread was created. format: date-time - `session_thread_id: str` Public `sthr_` ID of the newly created thread. - `workflow_run_id: Optional[str]` Identifier of the workflow run that created the thread, or `null` for any other thread. - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent` Emitted when an outcome evaluation cycle begins. - `type: Literal["span.outcome_evaluation_start"]` - `id: str` Unique identifier for this event. - `iteration: int` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. format: int32 - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when outcome evaluation started. format: date-time - `class BetaManagedAgentsSpanOutcomeEvaluationEndEvent` Emitted when an outcome evaluation cycle completes. Carries the verdict and aggregate token usage. A verdict of `needs_revision` means another evaluation cycle follows; `satisfied`, `max_iterations_reached`, `failed`, or `interrupted` are terminal — no further evaluation cycles follow. - `type: Literal["span.outcome_evaluation_end"]` - `id: str` Unique identifier for this event. - `explanation: str` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `iteration: int` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. format: int32 - `outcome_evaluation_start_id: str` The id of the corresponding `span.outcome_evaluation_start` event. - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when outcome evaluation ended. format: date-time - `result: str` Evaluation verdict. 'satisfied': criteria met, session goes idle. 'needs_revision': criteria not met, another revision cycle follows. 'max_iterations_reached': evaluation budget exhausted with criteria still unmet — one final acknowledgment turn follows before the session goes idle, but no further evaluation runs. 'failed': grader determined the rubric does not apply to the deliverables. 'interrupted': user sent an interrupt while evaluation was in progress. - `usage: BetaManagedAgentsSpanModelUsage` Aggregate token usage for this evaluation cycle. Sums across all grader model requests within the cycle. - `cache_creation_input_tokens: int` Tokens used to create prompt cache in this request. format: int32 - `cache_read_input_tokens: int` Tokens read from prompt cache in this request. format: int32 - `input_tokens: int` Input tokens consumed by this request. format: int32 - `output_tokens: int` Output tokens generated by this request. format: int32 - `speed: Optional[Literal["standard", "fast"]]` Inference speed tier this request actually ran at. Mirrors `usage.speed` on /v1/messages. Only present when the fast-mode beta is active. - `"standard"` - `"fast"` - `class BetaManagedAgentsSpanModelRequestStartEvent` Emitted when a model request is initiated by the agent. - `type: Literal["span.model_request_start"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the model request started. format: date-time - `class BetaManagedAgentsSpanModelRequestEndEvent` Emitted when a model request completes. - `type: Literal["span.model_request_end"]` - `id: str` Unique identifier for this event. - `is_error: Optional[bool]` Whether the model request resulted in an error. - `model_request_start_id: str` The id of the corresponding `span.model_request_start` event. - `model_usage: BetaManagedAgentsSpanModelUsage` Token usage for this model request. - `processed_at: datetime` Timestamp when the model request completed. format: date-time - `class BetaManagedAgentsSpanOutcomeEvaluationOngoingEvent` Periodic heartbeat emitted while an outcome evaluation cycle is in progress. Distinguishes 'evaluation is actively running' from 'evaluation is stuck' between the corresponding `span.outcome_evaluation_start` and `span.outcome_evaluation_end` events. - `type: Literal["span.outcome_evaluation_ongoing"]` - `id: str` Unique identifier for this event. - `iteration: int` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. format: int32 - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when this heartbeat was emitted. format: date-time - `class BetaManagedAgentsUserDefineOutcomeEvent` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `type: Literal["user.define_outcome"]` - `id: str` Unique identifier for this event. - `description: str` What the agent should produce. Copied from the input event. - `max_iterations: Optional[int]` Evaluate-then-revise cycles before giving up. Default 3, max 20. format: int32 - `outcome_id: str` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `processed_at: datetime` Timestamp when the outcome was accepted. format: date-time - `rubric: Rubric` How to grade the outcome. File rubrics are currently resolved to their text content; clients should handle both variants. - `class BetaManagedAgentsFileRubric` Rubric referenced by a file uploaded via the Files API. - `type: Literal["file"]` - `file_id: str` ID of the rubric file. - `class BetaManagedAgentsTextRubric` Rubric content provided inline as text. - `type: Literal["text"]` - `content: str` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `class BetaManagedAgentsSessionDeletedEvent` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `type: Literal["session.deleted"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the session was deleted. format: date-time - `class BetaManagedAgentsSessionThreadStatusRunningEvent` A session thread has begun executing. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_running"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that started running. - `class BetaManagedAgentsSessionThreadStatusIdleEvent` A session thread has yielded and is awaiting input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_idle"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that went idle. - `stop_details: Optional[BetaManagedAgentsSessionRefusalStopDetails]` Structured information about why the thread stopped. `null` when there is nothing more to report. - `stop_reason: StopReason` - `class BetaManagedAgentsSessionEndTurn` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionRequiresAction` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `class BetaManagedAgentsSessionRetriesExhausted` The turn ended because repeated errors exhausted the retry budget or an error escalated to `retry_status: 'exhausted'`. - `class BetaManagedAgentsSessionBudgetReached` The agent stopped because the session's tracked list cost reached its budget, or because its usage includes a model with no list price (which the budget cannot measure). Raise the budget to continue — or, if raising is rejected because a model has no list price, remove the budget. - `class BetaManagedAgentsSessionRefusal` The turn ended because the model's response was refused, for example by a safety classifier. - `class BetaManagedAgentsSessionThreadStatusTerminatedEvent` A session thread has terminated and will accept no further input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_terminated"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that terminated. - `class BetaManagedAgentsUserToolResultEvent` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `type: Literal["user.tool_result"]` - `id: str` Unique identifier for this event. - `tool_use_id: str` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `processed_at: Optional[datetime]` Timestamp when this result was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsSessionThreadStatusRescheduledEvent` A session thread hit a transient error and is retrying automatically. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_rescheduled"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that is retrying. - `class BetaManagedAgentsSessionUpdatedEvent` Emitted when an UpdateSession request changed at least one field. Carries only the fields that changed; absent fields were not part of the update. The new configuration applies from the next turn. - `type: Literal["session.updated"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the update was applied. format: date-time - `agent: Optional[BetaManagedAgentsSessionAgent]` The session's effective agent configuration after the update. Present only when the update changed `agent` (tools or mcp_servers); when present it is the full materialised snapshot, not a diff. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's budget after the update: the new budget when set or replaced, or null when the update removed it. Present only when the update changed the budget. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `metadata: Optional[Dict[str, str]]` The session's full metadata bag after the update. Present when the update set non-empty metadata; absent when metadata was unchanged or cleared to empty. - `title: Optional[str]` The session's new title. Present only when the update changed it. - `class BetaManagedAgentsStartEvent` Opens a preview of a buffered event. Carries the previewed event's type and id only. Followed by zero or more event_delta events with the same event id, normally concluded by the buffered event carrying that id. If the producing model request ends without that event (an error or interrupt mid-stream), its terminal span.model_request_end closes the preview. Only sent on stream connections that opt in via event_deltas; never appears in event history. - `type: Literal["event_start"]` - `event: BetaManagedAgentsStartEventPreview` The previewed event's type and id. The event type determines which delta types the preview's event_delta events carry: agent.message events stream content_delta fragments; agent.thinking previews are start-only — no deltas follow, and the buffered agent.thinking with the same id concludes them. - `class BetaManagedAgentsAgentMessagePreview` - `type: Literal["agent.message"]` - `id: str` The id the buffered agent.message will carry if it is emitted. Matches the event_id on this preview's event_delta events. - `class BetaManagedAgentsAgentThinkingPreview` - `type: Literal["agent.thinking"]` - `id: str` The id the buffered agent.thinking will carry if it is emitted. Start-only — no event_delta events follow. - `class BetaManagedAgentsDeltaEvent` An incremental update to an event that is still being streamed. Deltas are best-effort and may stop early; when the buffered event with id == event_id is produced it carries the complete content. A model request that ends early (an error or interrupt) produces no buffered event — its terminal span.model_request_end closes the preview. Only sent on stream connections that opt in via event_deltas; never appears in event history. - `type: Literal["event_delta"]` - `delta: BetaManagedAgentsDeltaContent` One fragment of the previewed event. The delta type is named for the previewed event's field it streams into: agent.message events stream content_delta fragments, each a partial element of the content array. - `type: Literal["content_delta"]` - `content: BetaManagedAgentsTextBlock` A partial element of the content array at index, typed like the element itself — the same shape the buffered agent.message carries in content. - `index: Optional[int]` Which entry in the previewed event's content array this fragment lands in. Insert content as that entry when the index is new; append to the existing entry otherwise. - `event_id: str` The id of the event being previewed. Matches event.id on the corresponding event_start and the buffered event that reconciles the preview. - `class BetaManagedAgentsSystemMessageEvent` A mid-conversation system message event. Carries system-role content that is appended to the session as a `role: "system"` turn. - `type: Literal["system.message"]` - `id: str` Unique identifier for this event. - `content: List[BetaManagedAgentsSystemContentBlock]` System content blocks. Text-only. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `processed_at: Optional[datetime]` Timestamp when this system message was processed. format: date-time - `class BetaManagedAgentsSessionUsageEvent` Periodic snapshot of the session's cumulative usage and tracked list cost. - `type: Literal["session.usage"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the snapshot was taken. format: date-time - `usage: BetaManagedAgentsSessionUsageSnapshot` The session's cumulative usage at the snapshot time. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's configured budget at the snapshot time, or null when the session has no budget. - `class BetaManagedAgentsWorkflowRunCreatedEvent` A workflow run was created. A workflow run is background work that the session's agent starts. Emitted once per run, before the run's other `workflow_run.*` events. - `type: Literal["workflow_run.created"]` - `id: str` Unique identifier for this event. - `description: Optional[str]` Description that the agent gave the run, passed on as written, or `null` if it gave none. - `name: str` Name that the agent gave the run, passed on as written, or a name that the server assigned. - `phases: List[BetaManagedAgentsWorkflowRunPhase]` The phases that the run's plan declares, in the plan's order. Can be empty. - `id: str` Unique identifier for the phase. - `description: Optional[str]` Description that the agent gave the phase, passed on as written, or `null` if it gave none. - `name: str` Name that the agent gave the phase, passed on as written. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunStatusEndedEvent` A workflow run ended. Emitted once per run, as the last of the run's `workflow_run.*` events. - `type: Literal["workflow_run.status_ended"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `result: BetaManagedAgentsWorkflowRunResult` How the run ended. - `class BetaManagedAgentsWorkflowRunResultCompleted` The run's plan, a program that the agent wrote, finished. This does not say whether the work succeeded. - `type: Literal["completed"]` - `class BetaManagedAgentsWorkflowRunResultError` The run failed or reached its time limit. - `type: Literal["error"]` - `error: BetaManagedAgentsWorkflowRunError` Why the run did not finish. - `class BetaManagedAgentsTimeoutWorkflowRunError` The run reached its time limit. - `type: Literal["timeout_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsProgramWorkflowRunError` The plan, a program that the agent wrote, failed, or the server refused it. - `type: Literal["program_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsUnknownWorkflowRunError` A failure that has no type of its own. - `type: Literal["unknown_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsThreadLimitWorkflowRunError` The run exceeded the limit on the number of threads that a run can create. - `type: Literal["thread_limit_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsMaxWorkflowRunsWorkflowRunError` No run was created, because the session was at its limit of open workflow runs, which are runs that have not ended. Only `workflow_run.error` carries this type. - `type: Literal["max_workflow_runs_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsWorkflowRunResultStopped` The agent stopped the run. - `type: Literal["stopped"]` - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunPhaseStartedEvent` A workflow run's plan entered a phase. - `type: Literal["workflow_run.phase_started"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `workflow_run_phase_id: str` Identifier of the phase, as in `phases` on the run's `workflow_run.created` event. - `class BetaManagedAgentsWorkflowRunPhaseEndedEvent` A workflow run's plan left a phase, or the run's end closed it. Emitted once for every `workflow_run.phase_started` event, before the run's `workflow_run.status_ended` event. The event does not say whether the plan finished the phase's work, or why it left. - `type: Literal["workflow_run.phase_ended"]` - `id: str` Unique identifier for this event. - `phase_started_id: str` Identifier of the `workflow_run.phase_started` event that opened the phase. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `workflow_run_phase_id: str` Identifier of the phase, as in `phases` on the run's `workflow_run.created` event. - `class BetaManagedAgentsWorkflowRunStatusRunningEvent` A workflow run is running. Emitted when the run starts to execute, and each time it resumes after being idle. A run that starts idle emits `workflow_run.status_idle` first. - `type: Literal["workflow_run.status_running"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunStatusIdleEvent` A workflow run is idle. Emitted each time the run goes idle, whatever the cause. If the run ends while idle, no `workflow_run.status_running` comes between this event and its `workflow_run.status_ended`. - `type: Literal["workflow_run.status_idle"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunErrorEvent` A workflow run met an error, or an error kept a run from being created. A run that ends with a `result.type` of `error` emits this event before its `workflow_run.status_ended`, with the same `error`. - `type: Literal["workflow_run.error"]` - `id: str` Unique identifier for this event. - `error: BetaManagedAgentsWorkflowRunError` Why the run did not finish, or was not created. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: Optional[str]` Identifier of the run that met the error, or `null` when the error kept a run from being created. #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) for event in client.beta.sessions.events.stream( session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ): print(event) ``` ##### Response (200) ```json { "id": "sevt_011CZkZGPp1iBcp4kaQSihUm", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ``` ## Sessions › Resources ### Add Session Resource `beta.sessions.resources.add(session_id, **kwargs) -> BetaManagedAgentsFileResource` **POST** `/v1/sessions/{session_id}/resources` Add Session Resource #### Parameters - `session_id: str` (path parameter) - `file_id: str` ID of a previously uploaded file. minLength: 1, maxLength: 128 - `type: Literal["file"]` - `mount_path: Optional[str]` Mount path in the container. Defaults to `/mnt/session/uploads/`. minLength: 1, maxLength: 4096 - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `class BetaManagedAgentsFileResource` - `type: Literal["file"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `file_id: str` - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) beta_managed_agents_file_resource = client.beta.sessions.resources.add( session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", file_id="file_011CNha8iCJcU1wXNR6q4V8w", type="file", ) print(beta_managed_agents_file_resource.id) ``` ##### Response (200) ```json { "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht", "created_at": "2026-03-15T10:00:00Z", "file_id": "file_011CNha8iCJcU1wXNR6q4V8w", "mount_path": "/uploads/receipt.pdf", "type": "file", "updated_at": "2026-03-15T10:00:00Z" } ``` ### List Session Resources `beta.sessions.resources.list(session_id, **kwargs) -> SyncPageCursor[BetaManagedAgentsSessionResource]` **GET** `/v1/sessions/{session_id}/resources` List Session Resources #### Parameters - `session_id: str` (path parameter) - `limit: Optional[int]` (query parameter) Maximum number of resources to return per page (max 1000). If omitted, returns all resources. format: int32 - `page: Optional[str]` (query parameter) Opaque cursor from a previous response's `next_page` field. - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `type BetaManagedAgentsSessionResource = ...` - `class BetaManagedAgentsGitHubRepositoryResource` - `type: Literal["github_repository"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `url: str` - `checkout: Optional[Checkout]` - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 - `class BetaManagedAgentsFileResource` - `type: Literal["file"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `file_id: str` - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `class BetaManagedAgentsMemoryStoreResource` A memory store attached to an agent session. - `type: Literal["memory_store"]` - `memory_store_id: str` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `access: Optional[Literal["read_write", "read_only"]]` Access mode for the mounted store. Defaults to `read_write`. `read_only` mounts the store as a read-only filesystem. - `"read_write"` - `"read_only"` - `description: Optional[str]` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `instructions: Optional[str]` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. maxLength: 4096 - `mount_path: Optional[str]` Filesystem path where the store is mounted in the session container, e.g. /mnt/memory/user-preferences. Derived from the store's name. Output-only. - `name: Optional[str]` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) page = client.beta.sessions.resources.list( session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) page = page.data[0] print(page) ``` ##### Response (200) ```json { "data": [ { "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht", "created_at": "2026-03-15T10:00:00Z", "file_id": "file_011CNha8iCJcU1wXNR6q4V8w", "mount_path": "/uploads/receipt.pdf", "type": "file", "updated_at": "2026-03-15T10:00:00Z" }, { "id": "sesrsc_011CZkZCKr6eXym1gWMPdQiu", "created_at": "2026-03-15T10:00:00Z", "mount_path": "/workspace/example-repo", "type": "github_repository", "updated_at": "2026-03-15T10:00:00Z", "url": "https://github.com/example-org/example-repo", "checkout": { "name": "main", "type": "branch" } } ], "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo=" } ``` ### Get Session Resource `beta.sessions.resources.retrieve(resource_id, **kwargs) -> ResourceRetrieveResponse` **GET** `/v1/sessions/{session_id}/resources/{resource_id}` Get Session Resource #### Parameters - `session_id: str` (path parameter) - `resource_id: str` (path parameter) - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `type ResourceRetrieveResponse = ...` The requested session resource. - `class BetaManagedAgentsGitHubRepositoryResource` - `type: Literal["github_repository"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `url: str` - `checkout: Optional[Checkout]` - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 - `class BetaManagedAgentsFileResource` - `type: Literal["file"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `file_id: str` - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `class BetaManagedAgentsMemoryStoreResource` A memory store attached to an agent session. - `type: Literal["memory_store"]` - `memory_store_id: str` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `access: Optional[Literal["read_write", "read_only"]]` Access mode for the mounted store. Defaults to `read_write`. `read_only` mounts the store as a read-only filesystem. - `"read_write"` - `"read_only"` - `description: Optional[str]` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `instructions: Optional[str]` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. maxLength: 4096 - `mount_path: Optional[str]` Filesystem path where the store is mounted in the session container, e.g. /mnt/memory/user-preferences. Derived from the store's name. Output-only. - `name: Optional[str]` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) resource = client.beta.sessions.resources.retrieve( resource_id="sesrsc_011CZkZBJq5dWxk9fVLNcPht", session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) print(resource) ``` ##### Response (200) ```json { "id": "sesrsc_011CZkZCKr6eXym1gWMPdQiu", "created_at": "2026-03-15T10:00:00Z", "mount_path": "/workspace/example-repo", "type": "github_repository", "updated_at": "2026-03-15T10:00:00Z", "url": "https://github.com/example-org/example-repo", "checkout": { "name": "main", "type": "branch" } } ``` ### Update Session Resource `beta.sessions.resources.update(resource_id, **kwargs) -> ResourceUpdateResponse` **POST** `/v1/sessions/{session_id}/resources/{resource_id}` Update Session Resource #### Parameters - `session_id: str` (path parameter) - `resource_id: str` (path parameter) - `authorization_token: str` New authorization token for the resource. Currently only `github_repository` resources support token rotation. minLength: 1, maxLength: 4096 - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `type ResourceUpdateResponse = ...` The updated session resource. - `class BetaManagedAgentsGitHubRepositoryResource` - `type: Literal["github_repository"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `url: str` - `checkout: Optional[Checkout]` - `class BetaManagedAgentsBranchCheckout` - `type: Literal["branch"]` - `name: str` Branch name to check out. minLength: 1, maxLength: 255 - `class BetaManagedAgentsCommitCheckout` - `type: Literal["commit"]` - `sha: str` Full commit SHA to check out. minLength: 7, maxLength: 64 - `class BetaManagedAgentsFileResource` - `type: Literal["file"]` - `id: str` - `created_at: datetime` A timestamp in RFC 3339 format format: date-time - `file_id: str` - `mount_path: str` - `updated_at: datetime` A timestamp in RFC 3339 format format: date-time - `class BetaManagedAgentsMemoryStoreResource` A memory store attached to an agent session. - `type: Literal["memory_store"]` - `memory_store_id: str` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `access: Optional[Literal["read_write", "read_only"]]` Access mode for the mounted store. Defaults to `read_write`. `read_only` mounts the store as a read-only filesystem. - `"read_write"` - `"read_only"` - `description: Optional[str]` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `instructions: Optional[str]` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. maxLength: 4096 - `mount_path: Optional[str]` Filesystem path where the store is mounted in the session container, e.g. /mnt/memory/user-preferences. Derived from the store's name. Output-only. - `name: Optional[str]` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) resource = client.beta.sessions.resources.update( resource_id="sesrsc_011CZkZBJq5dWxk9fVLNcPht", session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", authorization_token="ghp_exampletoken", ) print(resource) ``` ##### Response (200) ```json { "id": "sesrsc_011CZkZCKr6eXym1gWMPdQiu", "created_at": "2026-03-15T10:00:00Z", "mount_path": "/workspace/example-repo", "type": "github_repository", "updated_at": "2026-03-15T10:00:00Z", "url": "https://github.com/example-org/example-repo", "checkout": { "name": "main", "type": "branch" } } ``` ### Delete Session Resource `beta.sessions.resources.delete(resource_id, **kwargs) -> BetaManagedAgentsDeleteSessionResource` **DELETE** `/v1/sessions/{session_id}/resources/{resource_id}` Delete Session Resource #### Parameters - `session_id: str` (path parameter) - `resource_id: str` (path parameter) - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `class BetaManagedAgentsDeleteSessionResource` Confirmation of resource deletion. - `type: Literal["session_resource_deleted"]` - `id: str` #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) beta_managed_agents_delete_session_resource = client.beta.sessions.resources.delete( resource_id="sesrsc_011CZkZBJq5dWxk9fVLNcPht", session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) print(beta_managed_agents_delete_session_resource.id) ``` ##### Response (200) ```json { "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht", "type": "session_resource_deleted" } ``` ## Sessions › Threads ### List Session Threads `beta.sessions.threads.list(session_id, **kwargs) -> SyncPageCursor[BetaManagedAgentsSessionThread]` **GET** `/v1/sessions/{session_id}/threads` List Session Threads #### Parameters - `session_id: str` (path parameter) - `limit: Optional[int]` (query parameter) Maximum results per page. Defaults to 1000. format: int32 - `page: Optional[str]` (query parameter) Opaque pagination cursor from a previous response's `next_page`. Forward-only. - `statuses: Optional[List[BetaManagedAgentsSessionThreadStatus]]` (query parameter) Return only threads that have one of these statuses. Repeat the parameter to give more than one status. Leave it out to return threads of every status. - `"running"` - `"idle"` - `"rescheduling"` - `"terminated"` - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `class BetaManagedAgentsSessionThread` An execution thread within a `session`. Each session has one primary thread plus zero or more child threads. - `type: Literal["session_thread"]` - `id: str` Unique identifier for this thread. - `agent: Agent` Resolved agent definition for this thread. Snapshot of the agent at thread creation time. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsInlineAgent` An agent that has no Agent resource, and so no `id` or `version`. It is defined inline, in a workflow run's plan or when a session thread is spawned, and is not saved. - `type: Literal["inline"]` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` The name that the agent's definition gave, or one that the server assigned. - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `archived_at: Optional[datetime]` When the thread was archived. Null if not archived. format: date-time - `created_at: datetime` When the thread was created. format: date-time - `parent_thread_id: Optional[str]` Parent thread that spawned this thread. Null for the primary thread. - `session_id: str` The session this thread belongs to. - `stats: Optional[BetaManagedAgentsSessionThreadStats]` Timing statistics for this thread. Null until the thread's first status transition. - `active_seconds: Optional[float]` Cumulative time in seconds the thread spent actively running. Excludes idle time. format: double - `duration_seconds: Optional[float]` Elapsed time since thread creation in seconds. For archived threads, frozen at the final update. format: double - `startup_seconds: Optional[float]` Time in seconds for the thread to begin running. Zero for child threads, which start immediately. format: double - `status: BetaManagedAgentsSessionThreadStatus` Current execution status of the thread. - `"running"` - `"idle"` - `"rescheduling"` - `"terminated"` - `updated_at: datetime` When the thread was last updated. format: date-time - `usage: Optional[BetaManagedAgentsSessionThreadUsage]` Cumulative token usage for this thread. Null until the thread's first idle transition. - `active_seconds: Optional[float]` Cumulative time in seconds this thread spent in running status. Equal to `stats.active_seconds`; surfaced here so a thread's usage carries every quantity its cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of this thread across all turns, priced at public list rates. Absent until cost tracking is available for the thread. Each figure is rounded to the nearest cent independently and the session's aggregate `usage.list_cost` additionally includes session runtime, so per-thread costs do not sum exactly to the session figure; the session figure is authoritative and is what a budget is enforced against. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns of this thread. Absent until server-tool tracking is available for the thread. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `workflow_run_id: Optional[str]` Identifier of the workflow run that created the thread, or `null` for any other thread. #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) page = client.beta.sessions.threads.list( session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) page = page.data[0] print(page.id) ``` ##### Response (200) ```json { "data": [ { "id": "sthr_011CZkZVWa6oJjw1rgXZpnBt", "agent": { "id": "agent_011CZkYqphY8vELVzwCUpqiQ", "description": "A focused research subagent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "name": "Researcher", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" } ], "system": "You are a research subagent that gathers and summarises sources for the coordinating agent.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 }, "archived_at": null, "created_at": "2026-03-15T10:00:00Z", "parent_thread_id": null, "session_id": "sesn_011CZkZAtmR3yMPDzynEDxu7", "stats": { "active_seconds": 0, "duration_seconds": 0, "startup_seconds": 0 }, "status": "idle", "type": "session_thread", "updated_at": "2026-03-15T10:00:00Z", "usage": { "active_seconds": 0, "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "list_cost": { "amount": "2500", "currency": "USD" }, "output_tokens": 0, "server_tool_use": { "web_fetch_requests": 0, "web_search_requests": 3 } }, "workflow_run_id": null } ], "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo=" } ``` ### Get Session Thread `beta.sessions.threads.retrieve(thread_id, **kwargs) -> BetaManagedAgentsSessionThread` **GET** `/v1/sessions/{session_id}/threads/{thread_id}` Get Session Thread #### Parameters - `session_id: str` (path parameter) - `thread_id: str` (path parameter) - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `class BetaManagedAgentsSessionThread` An execution thread within a `session`. Each session has one primary thread plus zero or more child threads. - `type: Literal["session_thread"]` - `id: str` Unique identifier for this thread. - `agent: Agent` Resolved agent definition for this thread. Snapshot of the agent at thread creation time. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsInlineAgent` An agent that has no Agent resource, and so no `id` or `version`. It is defined inline, in a workflow run's plan or when a session thread is spawned, and is not saved. - `type: Literal["inline"]` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` The name that the agent's definition gave, or one that the server assigned. - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `archived_at: Optional[datetime]` When the thread was archived. Null if not archived. format: date-time - `created_at: datetime` When the thread was created. format: date-time - `parent_thread_id: Optional[str]` Parent thread that spawned this thread. Null for the primary thread. - `session_id: str` The session this thread belongs to. - `stats: Optional[BetaManagedAgentsSessionThreadStats]` Timing statistics for this thread. Null until the thread's first status transition. - `active_seconds: Optional[float]` Cumulative time in seconds the thread spent actively running. Excludes idle time. format: double - `duration_seconds: Optional[float]` Elapsed time since thread creation in seconds. For archived threads, frozen at the final update. format: double - `startup_seconds: Optional[float]` Time in seconds for the thread to begin running. Zero for child threads, which start immediately. format: double - `status: BetaManagedAgentsSessionThreadStatus` Current execution status of the thread. - `"running"` - `"idle"` - `"rescheduling"` - `"terminated"` - `updated_at: datetime` When the thread was last updated. format: date-time - `usage: Optional[BetaManagedAgentsSessionThreadUsage]` Cumulative token usage for this thread. Null until the thread's first idle transition. - `active_seconds: Optional[float]` Cumulative time in seconds this thread spent in running status. Equal to `stats.active_seconds`; surfaced here so a thread's usage carries every quantity its cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of this thread across all turns, priced at public list rates. Absent until cost tracking is available for the thread. Each figure is rounded to the nearest cent independently and the session's aggregate `usage.list_cost` additionally includes session runtime, so per-thread costs do not sum exactly to the session figure; the session figure is authoritative and is what a budget is enforced against. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns of this thread. Absent until server-tool tracking is available for the thread. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `workflow_run_id: Optional[str]` Identifier of the workflow run that created the thread, or `null` for any other thread. #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) beta_managed_agents_session_thread = client.beta.sessions.threads.retrieve( thread_id="sthr_011CZkZVWa6oJjw1rgXZpnBt", session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) print(beta_managed_agents_session_thread.id) ``` ##### Response (200) ```json { "id": "sthr_011CZkZVWa6oJjw1rgXZpnBt", "agent": { "id": "agent_011CZkYqphY8vELVzwCUpqiQ", "description": "A focused research subagent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "name": "Researcher", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" } ], "system": "You are a research subagent that gathers and summarises sources for the coordinating agent.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 }, "archived_at": null, "created_at": "2026-03-15T10:00:00Z", "parent_thread_id": null, "session_id": "sesn_011CZkZAtmR3yMPDzynEDxu7", "stats": { "active_seconds": 0, "duration_seconds": 0, "startup_seconds": 0 }, "status": "idle", "type": "session_thread", "updated_at": "2026-03-15T10:00:00Z", "usage": { "active_seconds": 0, "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "list_cost": { "amount": "2500", "currency": "USD" }, "output_tokens": 0, "server_tool_use": { "web_fetch_requests": 0, "web_search_requests": 3 } }, "workflow_run_id": null } ``` ### Archive Session Thread `beta.sessions.threads.archive(thread_id, **kwargs) -> BetaManagedAgentsSessionThread` **POST** `/v1/sessions/{session_id}/threads/{thread_id}/archive` Archive Session Thread #### Parameters - `session_id: str` (path parameter) - `thread_id: str` (path parameter) - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `class BetaManagedAgentsSessionThread` An execution thread within a `session`. Each session has one primary thread plus zero or more child threads. - `type: Literal["session_thread"]` - `id: str` Unique identifier for this thread. - `agent: Agent` Resolved agent definition for this thread. Snapshot of the agent at thread creation time. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsInlineAgent` An agent that has no Agent resource, and so no `id` or `version`. It is defined inline, in a workflow run's plan or when a session thread is spawned, and is not saved. - `type: Literal["inline"]` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` The name that the agent's definition gave, or one that the server assigned. - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `archived_at: Optional[datetime]` When the thread was archived. Null if not archived. format: date-time - `created_at: datetime` When the thread was created. format: date-time - `parent_thread_id: Optional[str]` Parent thread that spawned this thread. Null for the primary thread. - `session_id: str` The session this thread belongs to. - `stats: Optional[BetaManagedAgentsSessionThreadStats]` Timing statistics for this thread. Null until the thread's first status transition. - `active_seconds: Optional[float]` Cumulative time in seconds the thread spent actively running. Excludes idle time. format: double - `duration_seconds: Optional[float]` Elapsed time since thread creation in seconds. For archived threads, frozen at the final update. format: double - `startup_seconds: Optional[float]` Time in seconds for the thread to begin running. Zero for child threads, which start immediately. format: double - `status: BetaManagedAgentsSessionThreadStatus` Current execution status of the thread. - `"running"` - `"idle"` - `"rescheduling"` - `"terminated"` - `updated_at: datetime` When the thread was last updated. format: date-time - `usage: Optional[BetaManagedAgentsSessionThreadUsage]` Cumulative token usage for this thread. Null until the thread's first idle transition. - `active_seconds: Optional[float]` Cumulative time in seconds this thread spent in running status. Equal to `stats.active_seconds`; surfaced here so a thread's usage carries every quantity its cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of this thread across all turns, priced at public list rates. Absent until cost tracking is available for the thread. Each figure is rounded to the nearest cent independently and the session's aggregate `usage.list_cost` additionally includes session runtime, so per-thread costs do not sum exactly to the session figure; the session figure is authoritative and is what a budget is enforced against. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns of this thread. Absent until server-tool tracking is available for the thread. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `workflow_run_id: Optional[str]` Identifier of the workflow run that created the thread, or `null` for any other thread. #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) beta_managed_agents_session_thread = client.beta.sessions.threads.archive( thread_id="sthr_011CZkZVWa6oJjw1rgXZpnBt", session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) print(beta_managed_agents_session_thread.id) ``` ##### Response (200) ```json { "id": "sthr_011CZkZVWa6oJjw1rgXZpnBt", "agent": { "id": "agent_011CZkYqphY8vELVzwCUpqiQ", "description": "A focused research subagent.", "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5", "effort": { "type": "low" }, "inference_geo": "inference_geo", "speed": "standard" }, "name": "Researcher", "skills": [ { "skill_id": "xlsx", "type": "anthropic", "version": "1" } ], "system": "You are a research subagent that gathers and summarises sources for the coordinating agent.", "tools": [ { "configs": [ { "enabled": true, "name": "bash", "permission_policy": { "type": "always_allow" }, "type": "bash" } ], "default_config": { "enabled": true, "permission_policy": { "type": "always_ask" } }, "type": "agent_toolset_20260401" } ], "type": "agent", "version": 1 }, "archived_at": null, "created_at": "2026-03-15T10:00:00Z", "parent_thread_id": null, "session_id": "sesn_011CZkZAtmR3yMPDzynEDxu7", "stats": { "active_seconds": 0, "duration_seconds": 0, "startup_seconds": 0 }, "status": "idle", "type": "session_thread", "updated_at": "2026-03-15T10:00:00Z", "usage": { "active_seconds": 0, "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "list_cost": { "amount": "2500", "currency": "USD" }, "output_tokens": 0, "server_tool_use": { "web_fetch_requests": 0, "web_search_requests": 3 } }, "workflow_run_id": null } ``` ## Sessions › Threads › Events ### List Session Thread Events `beta.sessions.threads.events.list(thread_id, **kwargs) -> SyncPageCursor[BetaManagedAgentsSessionEvent]` **GET** `/v1/sessions/{session_id}/threads/{thread_id}/events` List Session Thread Events #### Parameters - `session_id: str` (path parameter) - `thread_id: str` (path parameter) - `limit: Optional[int]` (query parameter) format: int32 - `page: Optional[str]` (query parameter) - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `type BetaManagedAgentsSessionEvent = ...` Union type for all event types in a session. - `class BetaManagedAgentsUserMessageEvent` A user message event in the session conversation. - `type: Literal["user.message"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock` Regular text content. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `type: Literal["image"]` - `source: Source` The source of the image data. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `type: Literal["base64"]` - `data: str` Base64-encoded image data. minLength: 1 - `media_type: str` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). minLength: 1 - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: Literal["url"]` - `url: str` URL of the image to fetch. minLength: 1 - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type: Literal["document"]` - `source: Source` The source of the document data. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `type: Literal["base64"]` - `data: str` Base64-encoded document data. minLength: 1 - `media_type: str` MIME type of the document (e.g., "application/pdf"). minLength: 1 - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `type: Literal["text"]` - `data: str` The plain text content. minLength: 1 - `media_type: Literal["text/plain"]` MIME type of the text content. Must be "text/plain". - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: Literal["url"]` - `url: str` URL of the document to fetch. minLength: 1 - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `context: Optional[str]` Additional context about the document for the model. - `title: Optional[str]` The title of the document. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `type: Literal["redacted"]` - `processed_at: Optional[datetime]` Timestamp when the agent finished processing this message. format: date-time - `class BetaManagedAgentsUserInterruptEvent` An interrupt event that pauses agent execution and returns control to the user. - `type: Literal["user.interrupt"]` - `id: str` Unique identifier for this event. - `processed_at: Optional[datetime]` Timestamp when the interrupt was processed. format: date-time - `session_thread_id: Optional[str]` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `class BetaManagedAgentsUserToolConfirmationEvent` A tool confirmation event that approves or denies a pending tool execution. - `type: Literal["user.tool_confirmation"]` - `id: str` Unique identifier for this event. - `result: Literal["allow", "deny"]` The confirmation result: 'allow' or 'deny'. - `"allow"` - `"deny"` - `tool_use_id: str` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `deny_message: Optional[str]` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. maxLength: 10000 - `processed_at: Optional[datetime]` Timestamp when the confirmation was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this confirmation was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsUserCustomToolResultEvent` Event sent by the client providing the result of a custom tool execution. - `type: Literal["user.custom_tool_result"]` - `id: str` Unique identifier for this event. - `custom_tool_use_id: str` The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `type: Literal["search_result"]` - `citations: BetaManagedAgentsSearchResultCitations` Citation settings for this search result. - `enabled: bool` Whether citations are enabled for this search result. - `content: List[BetaManagedAgentsSearchResultContent]` Array of text content blocks from the search result. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `source: str` The URL source of the search result. minLength: 1 - `title: str` The title of the search result. minLength: 1 - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `processed_at: Optional[datetime]` Timestamp when this result was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsAgentCustomToolUseEvent` Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result. The client can send it as soon as this event arrives, without waiting for `session.status_idle`. - `type: Literal["agent.custom_tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `name: str` Name of the custom tool being called. - `processed_at: datetime` Timestamp when this tool use was processed. format: date-time - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its custom tool use on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.custom_tool_result` by `custom_tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentMessageEvent` An agent response event in the session conversation. - `type: Literal["agent.message"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Array of text blocks comprising the agent response. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `processed_at: datetime` Timestamp when this response was generated. format: date-time - `class BetaManagedAgentsAgentThinkingEvent` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `type: Literal["agent.thinking"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this thinking was produced. format: date-time - `class BetaManagedAgentsAgentMCPToolUseEvent` Event emitted when the agent invokes a tool provided by an MCP server. - `type: Literal["agent.mcp_tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `mcp_server_name: str` Name of the MCP server providing the tool. - `name: str` Name of the MCP tool being used. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `evaluated_permission: Optional[BetaManagedAgentsAgentEvaluatedPermission]` The evaluated permission policy for this tool invocation. - `"allow"` - `"ask"` - `"deny"` - `evaluation: Optional[BetaManagedAgentsAgentToolEvaluation]` Which resolved permission_policy produced evaluated_permission: always_allow, always_ask, or auto (with the server's per-invocation judgement). Absent only when the server refused the call before any policy applied (for example, the named tool is not enabled in the session); such a refusal has evaluated_permission deny. An event recorded before this field existed reads as the arm its evaluated_permission implies (always_allow for allow, always_ask for ask). - `class BetaManagedAgentsAgentToolEvaluationAlwaysAllow` The resolved permission_policy was always_allow; accompanies evaluated_permission "allow". - `type: Literal["always_allow"]` - `class BetaManagedAgentsAgentToolEvaluationAlwaysAsk` The resolved permission_policy was always_ask; accompanies evaluated_permission "ask". - `type: Literal["always_ask"]` - `class BetaManagedAgentsAgentToolEvaluationAuto` The resolved permission_policy was auto: the server judged this invocation individually. - `type: Literal["auto"]` - `evaluated_permission: BetaManagedAgentsAgentAutoEvaluatedPermission` The server's judgement for this invocation. - `class BetaManagedAgentsAgentAutoEvaluatedPermissionAllow` The server judged the invocation safe to execute without client approval. - `type: Literal["allow"]` - `class BetaManagedAgentsAgentAutoEvaluatedPermissionAsk` The server reached no judgement; the invocation is held for client approval. - `type: Literal["ask"]` - `reason_code: str` The judgement's grounds in registry-bound terms, for client branching and audit rather than end-user display. Open registry; currently "indeterminate" (no judgement was reached). Clients must tolerate values outside this set. maxLength: 64 - `class BetaManagedAgentsAgentAutoEvaluatedPermissionDeny` The server judged the invocation high-risk; it does not execute and a synthetic error tool result is appended. - `type: Literal["deny"]` - `reason_code: str` The judgement's grounds in registry-bound terms. Open registry; currently "high_risk" (judged high-risk; the call does not run). Clients must tolerate values outside this set. maxLength: 64 - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.tool_confirmation` by `tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentMCPToolResultEvent` Event representing the result of an MCP tool execution. - `type: Literal["agent.mcp_tool_result"]` - `id: str` Unique identifier for this event. - `mcp_tool_use_id: str` The id of the `agent.mcp_tool_use` event this result corresponds to. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent` Event emitted when the agent invokes a built-in agent tool. - `type: Literal["agent.tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `name: str` Name of the agent tool being used. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `evaluated_permission: Optional[BetaManagedAgentsAgentEvaluatedPermission]` The evaluated permission policy for this tool invocation. - `evaluation: Optional[BetaManagedAgentsAgentToolEvaluation]` Which resolved permission_policy produced evaluated_permission: always_allow, always_ask, or auto (with the server's per-invocation judgement). Absent only when the server refused the call before any policy applied (for example, the named tool is not enabled in the session); such a refusal has evaluated_permission deny. An event recorded before this field existed reads as the arm its evaluated_permission implies (always_allow for allow, always_ask for ask). - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.tool_confirmation` or `user.tool_result` by `tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentToolResultEvent` Event representing the result of an agent tool execution. - `type: Literal["agent.tool_result"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `tool_use_id: str` The id of the `agent.tool_use` event this result corresponds to. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentThreadMessageReceivedEvent` Delivery event written to the target thread's input stream when an agent-to-agent message arrives. - `type: Literal["agent.thread_message_received"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Message content blocks. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `from_session_thread_id: str` Public `sthr_` ID of the thread that sent the message. - `processed_at: datetime` Timestamp when the message was received. format: date-time - `from_agent_name: Optional[str]` Name of the callable agent this message came from. Absent when received from the primary agent. - `class BetaManagedAgentsAgentThreadMessageSentEvent` Observability event emitted to the sender's output stream when an agent-to-agent message is sent. - `type: Literal["agent.thread_message_sent"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Message content blocks. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `processed_at: datetime` Timestamp when the message was sent. format: date-time - `to_session_thread_id: str` Public `sthr_` ID of the thread the message was sent to. - `to_agent_name: Optional[str]` Name of the callable agent this message was sent to. Absent when sent to the primary agent. - `class BetaManagedAgentsAgentThreadContextCompactedEvent` Indicates that context compaction (summarization) occurred during the session. - `type: Literal["agent.thread_context_compacted"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when compaction was processed. format: date-time - `class BetaManagedAgentsSessionErrorEvent` An error event indicating a problem occurred during session execution. - `type: Literal["session.error"]` - `id: str` Unique identifier for this event. - `error: Error` - `class BetaManagedAgentsUnknownError` An unknown or unexpected error occurred during session execution. A fallback variant; clients that don't recognize a new error code can match on `retry_status` and `message` alone. - `type: Literal["unknown_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `type: Literal["retrying"]` - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type: Literal["exhausted"]` - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `type: Literal["terminal"]` - `class BetaManagedAgentsModelOverloadedError` The model is currently overloaded. Emitted after automatic retries are exhausted. - `type: Literal["model_overloaded_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsModelRateLimitedError` The model request was rate-limited. - `type: Literal["model_rate_limited_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsModelRequestFailedError` A model request failed for a reason other than overload or rate-limiting. - `type: Literal["model_request_failed_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsMCPConnectionFailedError` Failed to connect to an MCP server. - `type: Literal["mcp_connection_failed_error"]` - `mcp_server_name: str` Name of the MCP server that failed to connect. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsMCPAuthenticationFailedError` Authentication to an MCP server failed. - `type: Literal["mcp_authentication_failed_error"]` - `mcp_server_name: str` Name of the MCP server that failed authentication. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsBillingError` The caller's organization or workspace cannot make model requests — out of credits or spend limit reached. Retrying with the same credentials will not succeed; the caller must resolve the billing state. - `type: Literal["billing_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsCredentialHostUnreachableError` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `type: Literal["credential_host_unreachable_error"]` - `credential_id: str` ID of the affected credential. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `vault_id: str` ID of the vault containing the affected credential. - `class BetaManagedAgentsRepositoryAuthenticationError` The repository host rejected the credentials, or required credentials and received none. - `type: Literal["repository_authentication_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryForbiddenError` The repository host refused access to the repository. - `type: Literal["repository_forbidden_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryNotFoundError` The repository host reported the repository as not found. - `type: Literal["repository_not_found_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryCheckoutError` The requested branch or commit does not exist in the repository. - `type: Literal["repository_checkout_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryCloneError` The repository could not be cloned. - `type: Literal["repository_clone_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `processed_at: datetime` Timestamp when the error occurred. format: date-time - `class BetaManagedAgentsSessionStatusRescheduledEvent` Indicates the session is recovering from an error state and is rescheduled for execution. - `type: Literal["session.status_rescheduled"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionStatusRunningEvent` Indicates the session is actively running and the agent is working. - `type: Literal["session.status_running"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionStatusIdleEvent` Indicates the agent has paused and is awaiting user input. - `type: Literal["session.status_idle"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `stop_details: Optional[BetaManagedAgentsSessionRefusalStopDetails]` Structured information about why the session stopped. `null` when there is nothing more to report. - `type: Literal["refusal"]` - `category: Optional[Literal["cyber", "bio", "frontier_llm", 2 more]]` The policy category that triggered the refusal, or `null` when there is no named category. New values can be added over time. - `"cyber"` - `"bio"` - `"frontier_llm"` - `"reasoning_extraction"` - `"general_harms"` - `explanation: Optional[str]` Human-readable explanation of the refusal, or `null` when none is available. The wording can change, so do not parse it. - `stop_reason: StopReason` - `class BetaManagedAgentsSessionEndTurn` The agent completed its turn naturally and is ready for the next user message. - `type: Literal["end_turn"]` - `class BetaManagedAgentsSessionRequiresAction` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `type: Literal["requires_action"]` - `event_ids: List[str]` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `class BetaManagedAgentsSessionRetriesExhausted` The turn ended because repeated errors exhausted the retry budget or an error escalated to `retry_status: 'exhausted'`. - `type: Literal["retries_exhausted"]` - `class BetaManagedAgentsSessionBudgetReached` The agent stopped because the session's tracked list cost reached its budget, or because its usage includes a model with no list price (which the budget cannot measure). Raise the budget to continue — or, if raising is rejected because a model has no list price, remove the budget. - `type: Literal["budget_reached"]` - `class BetaManagedAgentsSessionRefusal` The turn ended because the model's response was refused, for example by a safety classifier. - `type: Literal["refusal"]` - `class BetaManagedAgentsSessionStatusTerminatedEvent` Indicates the session has terminated, either due to an error or completion. - `type: Literal["session.status_terminated"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionThreadCreatedEvent` Emitted when a child thread is created. Written to the parent thread's output stream so clients observing the session see child creation. - `type: Literal["session.thread_created"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the callable agent the thread runs. - `processed_at: datetime` Timestamp when the thread was created. format: date-time - `session_thread_id: str` Public `sthr_` ID of the newly created thread. - `workflow_run_id: Optional[str]` Identifier of the workflow run that created the thread, or `null` for any other thread. - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent` Emitted when an outcome evaluation cycle begins. - `type: Literal["span.outcome_evaluation_start"]` - `id: str` Unique identifier for this event. - `iteration: int` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. format: int32 - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when outcome evaluation started. format: date-time - `class BetaManagedAgentsSpanOutcomeEvaluationEndEvent` Emitted when an outcome evaluation cycle completes. Carries the verdict and aggregate token usage. A verdict of `needs_revision` means another evaluation cycle follows; `satisfied`, `max_iterations_reached`, `failed`, or `interrupted` are terminal — no further evaluation cycles follow. - `type: Literal["span.outcome_evaluation_end"]` - `id: str` Unique identifier for this event. - `explanation: str` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `iteration: int` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. format: int32 - `outcome_evaluation_start_id: str` The id of the corresponding `span.outcome_evaluation_start` event. - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when outcome evaluation ended. format: date-time - `result: str` Evaluation verdict. 'satisfied': criteria met, session goes idle. 'needs_revision': criteria not met, another revision cycle follows. 'max_iterations_reached': evaluation budget exhausted with criteria still unmet — one final acknowledgment turn follows before the session goes idle, but no further evaluation runs. 'failed': grader determined the rubric does not apply to the deliverables. 'interrupted': user sent an interrupt while evaluation was in progress. - `usage: BetaManagedAgentsSpanModelUsage` Aggregate token usage for this evaluation cycle. Sums across all grader model requests within the cycle. - `cache_creation_input_tokens: int` Tokens used to create prompt cache in this request. format: int32 - `cache_read_input_tokens: int` Tokens read from prompt cache in this request. format: int32 - `input_tokens: int` Input tokens consumed by this request. format: int32 - `output_tokens: int` Output tokens generated by this request. format: int32 - `speed: Optional[Literal["standard", "fast"]]` Inference speed tier this request actually ran at. Mirrors `usage.speed` on /v1/messages. Only present when the fast-mode beta is active. - `"standard"` - `"fast"` - `class BetaManagedAgentsSpanModelRequestStartEvent` Emitted when a model request is initiated by the agent. - `type: Literal["span.model_request_start"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the model request started. format: date-time - `class BetaManagedAgentsSpanModelRequestEndEvent` Emitted when a model request completes. - `type: Literal["span.model_request_end"]` - `id: str` Unique identifier for this event. - `is_error: Optional[bool]` Whether the model request resulted in an error. - `model_request_start_id: str` The id of the corresponding `span.model_request_start` event. - `model_usage: BetaManagedAgentsSpanModelUsage` Token usage for this model request. - `processed_at: datetime` Timestamp when the model request completed. format: date-time - `class BetaManagedAgentsSpanOutcomeEvaluationOngoingEvent` Periodic heartbeat emitted while an outcome evaluation cycle is in progress. Distinguishes 'evaluation is actively running' from 'evaluation is stuck' between the corresponding `span.outcome_evaluation_start` and `span.outcome_evaluation_end` events. - `type: Literal["span.outcome_evaluation_ongoing"]` - `id: str` Unique identifier for this event. - `iteration: int` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. format: int32 - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when this heartbeat was emitted. format: date-time - `class BetaManagedAgentsUserDefineOutcomeEvent` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `type: Literal["user.define_outcome"]` - `id: str` Unique identifier for this event. - `description: str` What the agent should produce. Copied from the input event. - `max_iterations: Optional[int]` Evaluate-then-revise cycles before giving up. Default 3, max 20. format: int32 - `outcome_id: str` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `processed_at: datetime` Timestamp when the outcome was accepted. format: date-time - `rubric: Rubric` How to grade the outcome. File rubrics are currently resolved to their text content; clients should handle both variants. - `class BetaManagedAgentsFileRubric` Rubric referenced by a file uploaded via the Files API. - `type: Literal["file"]` - `file_id: str` ID of the rubric file. - `class BetaManagedAgentsTextRubric` Rubric content provided inline as text. - `type: Literal["text"]` - `content: str` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `class BetaManagedAgentsSessionDeletedEvent` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `type: Literal["session.deleted"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the session was deleted. format: date-time - `class BetaManagedAgentsSessionThreadStatusRunningEvent` A session thread has begun executing. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_running"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that started running. - `class BetaManagedAgentsSessionThreadStatusIdleEvent` A session thread has yielded and is awaiting input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_idle"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that went idle. - `stop_details: Optional[BetaManagedAgentsSessionRefusalStopDetails]` Structured information about why the thread stopped. `null` when there is nothing more to report. - `stop_reason: StopReason` - `class BetaManagedAgentsSessionEndTurn` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionRequiresAction` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `class BetaManagedAgentsSessionRetriesExhausted` The turn ended because repeated errors exhausted the retry budget or an error escalated to `retry_status: 'exhausted'`. - `class BetaManagedAgentsSessionBudgetReached` The agent stopped because the session's tracked list cost reached its budget, or because its usage includes a model with no list price (which the budget cannot measure). Raise the budget to continue — or, if raising is rejected because a model has no list price, remove the budget. - `class BetaManagedAgentsSessionRefusal` The turn ended because the model's response was refused, for example by a safety classifier. - `class BetaManagedAgentsSessionThreadStatusTerminatedEvent` A session thread has terminated and will accept no further input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_terminated"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that terminated. - `class BetaManagedAgentsUserToolResultEvent` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `type: Literal["user.tool_result"]` - `id: str` Unique identifier for this event. - `tool_use_id: str` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `processed_at: Optional[datetime]` Timestamp when this result was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsSessionThreadStatusRescheduledEvent` A session thread hit a transient error and is retrying automatically. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_rescheduled"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that is retrying. - `class BetaManagedAgentsSessionUpdatedEvent` Emitted when an UpdateSession request changed at least one field. Carries only the fields that changed; absent fields were not part of the update. The new configuration applies from the next turn. - `type: Literal["session.updated"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the update was applied. format: date-time - `agent: Optional[BetaManagedAgentsSessionAgent]` The session's effective agent configuration after the update. Present only when the update changed `agent` (tools or mcp_servers); when present it is the full materialised snapshot, not a diff. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's budget after the update: the new budget when set or replaced, or null when the update removed it. Present only when the update changed the budget. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `metadata: Optional[Dict[str, str]]` The session's full metadata bag after the update. Present when the update set non-empty metadata; absent when metadata was unchanged or cleared to empty. - `title: Optional[str]` The session's new title. Present only when the update changed it. - `class BetaManagedAgentsSystemMessageEvent` A mid-conversation system message event. Carries system-role content that is appended to the session as a `role: "system"` turn. - `type: Literal["system.message"]` - `id: str` Unique identifier for this event. - `content: List[BetaManagedAgentsSystemContentBlock]` System content blocks. Text-only. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `processed_at: Optional[datetime]` Timestamp when this system message was processed. format: date-time - `class BetaManagedAgentsSessionUsageEvent` Periodic snapshot of the session's cumulative usage and tracked list cost. - `type: Literal["session.usage"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the snapshot was taken. format: date-time - `usage: BetaManagedAgentsSessionUsageSnapshot` The session's cumulative usage at the snapshot time. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's configured budget at the snapshot time, or null when the session has no budget. - `class BetaManagedAgentsWorkflowRunCreatedEvent` A workflow run was created. A workflow run is background work that the session's agent starts. Emitted once per run, before the run's other `workflow_run.*` events. - `type: Literal["workflow_run.created"]` - `id: str` Unique identifier for this event. - `description: Optional[str]` Description that the agent gave the run, passed on as written, or `null` if it gave none. - `name: str` Name that the agent gave the run, passed on as written, or a name that the server assigned. - `phases: List[BetaManagedAgentsWorkflowRunPhase]` The phases that the run's plan declares, in the plan's order. Can be empty. - `id: str` Unique identifier for the phase. - `description: Optional[str]` Description that the agent gave the phase, passed on as written, or `null` if it gave none. - `name: str` Name that the agent gave the phase, passed on as written. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunStatusEndedEvent` A workflow run ended. Emitted once per run, as the last of the run's `workflow_run.*` events. - `type: Literal["workflow_run.status_ended"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `result: BetaManagedAgentsWorkflowRunResult` How the run ended. - `class BetaManagedAgentsWorkflowRunResultCompleted` The run's plan, a program that the agent wrote, finished. This does not say whether the work succeeded. - `type: Literal["completed"]` - `class BetaManagedAgentsWorkflowRunResultError` The run failed or reached its time limit. - `type: Literal["error"]` - `error: BetaManagedAgentsWorkflowRunError` Why the run did not finish. - `class BetaManagedAgentsTimeoutWorkflowRunError` The run reached its time limit. - `type: Literal["timeout_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsProgramWorkflowRunError` The plan, a program that the agent wrote, failed, or the server refused it. - `type: Literal["program_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsUnknownWorkflowRunError` A failure that has no type of its own. - `type: Literal["unknown_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsThreadLimitWorkflowRunError` The run exceeded the limit on the number of threads that a run can create. - `type: Literal["thread_limit_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsMaxWorkflowRunsWorkflowRunError` No run was created, because the session was at its limit of open workflow runs, which are runs that have not ended. Only `workflow_run.error` carries this type. - `type: Literal["max_workflow_runs_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsWorkflowRunResultStopped` The agent stopped the run. - `type: Literal["stopped"]` - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunPhaseStartedEvent` A workflow run's plan entered a phase. - `type: Literal["workflow_run.phase_started"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `workflow_run_phase_id: str` Identifier of the phase, as in `phases` on the run's `workflow_run.created` event. - `class BetaManagedAgentsWorkflowRunPhaseEndedEvent` A workflow run's plan left a phase, or the run's end closed it. Emitted once for every `workflow_run.phase_started` event, before the run's `workflow_run.status_ended` event. The event does not say whether the plan finished the phase's work, or why it left. - `type: Literal["workflow_run.phase_ended"]` - `id: str` Unique identifier for this event. - `phase_started_id: str` Identifier of the `workflow_run.phase_started` event that opened the phase. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `workflow_run_phase_id: str` Identifier of the phase, as in `phases` on the run's `workflow_run.created` event. - `class BetaManagedAgentsWorkflowRunStatusRunningEvent` A workflow run is running. Emitted when the run starts to execute, and each time it resumes after being idle. A run that starts idle emits `workflow_run.status_idle` first. - `type: Literal["workflow_run.status_running"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunStatusIdleEvent` A workflow run is idle. Emitted each time the run goes idle, whatever the cause. If the run ends while idle, no `workflow_run.status_running` comes between this event and its `workflow_run.status_ended`. - `type: Literal["workflow_run.status_idle"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunErrorEvent` A workflow run met an error, or an error kept a run from being created. A run that ends with a `result.type` of `error` emits this event before its `workflow_run.status_ended`, with the same `error`. - `type: Literal["workflow_run.error"]` - `id: str` Unique identifier for this event. - `error: BetaManagedAgentsWorkflowRunError` Why the run did not finish, or was not created. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: Optional[str]` Identifier of the run that met the error, or `null` when the error kept a run from being created. #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) page = client.beta.sessions.threads.events.list( thread_id="sthr_011CZkZVWa6oJjw1rgXZpnBt", session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ) page = page.data[0] print(page) ``` ##### Response (200) ```json { "data": [ { "id": "sevt_011CZkZGPp1iBcp4kaQSihUm", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" }, { "id": "sevt_011CZkZHPq1jCdq5mbRTjiVn", "content": [ { "text": "Let me look up order #1234 for you.", "type": "text" } ], "processed_at": "2026-03-15T10:00:00Z", "type": "agent.message" } ], "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo=" } ``` ### Stream Session Thread Events `beta.sessions.threads.events.stream(thread_id, **kwargs) -> BetaManagedAgentsStreamSessionThreadEvents` **GET** `/v1/sessions/{session_id}/threads/{thread_id}/stream` Stream Session Thread Events #### Parameters - `session_id: str` (path parameter) - `thread_id: str` (path parameter) - `event_deltas: Optional[List[BetaManagedAgentsDeltaType]]` (query parameter) When set, this connection also receives streaming deltas (`event_start`, `event_delta`) while an event is being produced, before the event itself arrives. Deltas are best-effort; when the final event is produced it carries the complete content. A model request that ends early (an error or interrupt) produces no final event — its terminal `span.model_request_end` closes the preview. Accepts one or more event types to preview and may be repeated: `agent.message` streams `content_delta` fragments; `agent.thinking` is start-only — a signal that the agent has begun extended thinking, concluded by the `agent.thinking` event itself. Only previews of the requested event types are sent. - `"agent.message"` - `"agent.thinking"` - `betas: Optional[List[AnthropicBetaParam]]` (header parameter) Optional header to specify the beta version(s) you want to use. - `str` - `"message-batches-2024-09-24"` - `"prompt-caching-2024-07-31"` - `"computer-use-2024-10-22"` - `"computer-use-2025-01-24"` - `"pdfs-2024-09-25"` - `"token-counting-2024-11-01"` - `"token-efficient-tools-2025-02-19"` - `"output-128k-2025-02-19"` - `"files-api-2025-04-14"` - `"mcp-client-2025-04-04"` - `"mcp-client-2025-11-20"` - `"dev-full-thinking-2025-05-14"` - `"interleaved-thinking-2025-05-14"` - `"code-execution-2025-05-22"` - `"extended-cache-ttl-2025-04-11"` - `"context-1m-2025-08-07"` - `"context-management-2025-06-27"` - `"model-context-window-exceeded-2025-08-26"` - `"skills-2025-10-02"` - `"fast-mode-2026-02-01"` - `"output-300k-2026-03-24"` - `"user-profiles-2026-03-24"` - `"user-profiles-2026-08-18"` - `"user-profiles-2026-09-04"` - `"advisor-tool-2026-03-01"` - `"managed-agents-2026-04-01"` - `"cache-diagnosis-2026-04-07"` - `"dreaming-2026-04-21"` - `"thinking-token-count-2026-05-13"` - `"server-side-fallback-2026-06-01"` - `"server-side-fallback-2026-07-01"` - `"fallback-credit-2026-06-01"` - `"fallback-credit-2026-07-01"` - `"agent-memory-2026-07-22"` - `"mid-conversation-tool-changes-2026-07-01"` - `"compact-2026-01-12"` - `"computer-use-2025-11-24"` - `"mcp-tunnels-2026-06-22"` - `"structured-outputs-2025-11-13"` - `"task-budgets-2026-03-13"` - `"thinking-display-updates-2026-08-18"` - `"ce-user-management-2026-07-13"` - `"mid-conversation-output-config-2026-07-01"` - `"thinking-binding-controls-2026-08-01"` - `"mid-conversation-system-clear-at-2026-08-21"` - `"compact-2026-09-04"` - `"inline-tools-2026-09-15"` - `"mcp-client-2026-09-15"` - `"ce-plugins-2026-09-01"` - `"spend-limit-reads-2026-09-26"` - `workspace_id: Optional[str]` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. #### Returns - `type BetaManagedAgentsStreamSessionThreadEvents = ...` Server-sent event in a single thread's stream. - `class BetaManagedAgentsUserMessageEvent` A user message event in the session conversation. - `type: Literal["user.message"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock` Regular text content. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `type: Literal["image"]` - `source: Source` The source of the image data. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `type: Literal["base64"]` - `data: str` Base64-encoded image data. minLength: 1 - `media_type: str` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). minLength: 1 - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: Literal["url"]` - `url: str` URL of the image to fetch. minLength: 1 - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type: Literal["document"]` - `source: Source` The source of the document data. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `type: Literal["base64"]` - `data: str` Base64-encoded document data. minLength: 1 - `media_type: str` MIME type of the document (e.g., "application/pdf"). minLength: 1 - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `type: Literal["text"]` - `data: str` The plain text content. minLength: 1 - `media_type: Literal["text/plain"]` MIME type of the text content. Must be "text/plain". - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: Literal["url"]` - `url: str` URL of the document to fetch. minLength: 1 - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `type: Literal["file"]` - `file_id: str` ID of a previously uploaded file. minLength: 1 - `context: Optional[str]` Additional context about the document for the model. - `title: Optional[str]` The title of the document. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `type: Literal["redacted"]` - `processed_at: Optional[datetime]` Timestamp when the agent finished processing this message. format: date-time - `class BetaManagedAgentsUserInterruptEvent` An interrupt event that pauses agent execution and returns control to the user. - `type: Literal["user.interrupt"]` - `id: str` Unique identifier for this event. - `processed_at: Optional[datetime]` Timestamp when the interrupt was processed. format: date-time - `session_thread_id: Optional[str]` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `class BetaManagedAgentsUserToolConfirmationEvent` A tool confirmation event that approves or denies a pending tool execution. - `type: Literal["user.tool_confirmation"]` - `id: str` Unique identifier for this event. - `result: Literal["allow", "deny"]` The confirmation result: 'allow' or 'deny'. - `"allow"` - `"deny"` - `tool_use_id: str` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `deny_message: Optional[str]` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. maxLength: 10000 - `processed_at: Optional[datetime]` Timestamp when the confirmation was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this confirmation was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsUserCustomToolResultEvent` Event sent by the client providing the result of a custom tool execution. - `type: Literal["user.custom_tool_result"]` - `id: str` Unique identifier for this event. - `custom_tool_use_id: str` The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `type: Literal["search_result"]` - `citations: BetaManagedAgentsSearchResultCitations` Citation settings for this search result. - `enabled: bool` Whether citations are enabled for this search result. - `content: List[BetaManagedAgentsSearchResultContent]` Array of text content blocks from the search result. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `source: str` The URL source of the search result. minLength: 1 - `title: str` The title of the search result. minLength: 1 - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `processed_at: Optional[datetime]` Timestamp when this result was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsAgentCustomToolUseEvent` Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result. The client can send it as soon as this event arrives, without waiting for `session.status_idle`. - `type: Literal["agent.custom_tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `name: str` Name of the custom tool being called. - `processed_at: datetime` Timestamp when this tool use was processed. format: date-time - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its custom tool use on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.custom_tool_result` by `custom_tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentMessageEvent` An agent response event in the session conversation. - `type: Literal["agent.message"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Array of text blocks comprising the agent response. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `processed_at: datetime` Timestamp when this response was generated. format: date-time - `class BetaManagedAgentsAgentThinkingEvent` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `type: Literal["agent.thinking"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this thinking was produced. format: date-time - `class BetaManagedAgentsAgentMCPToolUseEvent` Event emitted when the agent invokes a tool provided by an MCP server. - `type: Literal["agent.mcp_tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `mcp_server_name: str` Name of the MCP server providing the tool. - `name: str` Name of the MCP tool being used. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `evaluated_permission: Optional[BetaManagedAgentsAgentEvaluatedPermission]` The evaluated permission policy for this tool invocation. - `"allow"` - `"ask"` - `"deny"` - `evaluation: Optional[BetaManagedAgentsAgentToolEvaluation]` Which resolved permission_policy produced evaluated_permission: always_allow, always_ask, or auto (with the server's per-invocation judgement). Absent only when the server refused the call before any policy applied (for example, the named tool is not enabled in the session); such a refusal has evaluated_permission deny. An event recorded before this field existed reads as the arm its evaluated_permission implies (always_allow for allow, always_ask for ask). - `class BetaManagedAgentsAgentToolEvaluationAlwaysAllow` The resolved permission_policy was always_allow; accompanies evaluated_permission "allow". - `type: Literal["always_allow"]` - `class BetaManagedAgentsAgentToolEvaluationAlwaysAsk` The resolved permission_policy was always_ask; accompanies evaluated_permission "ask". - `type: Literal["always_ask"]` - `class BetaManagedAgentsAgentToolEvaluationAuto` The resolved permission_policy was auto: the server judged this invocation individually. - `type: Literal["auto"]` - `evaluated_permission: BetaManagedAgentsAgentAutoEvaluatedPermission` The server's judgement for this invocation. - `class BetaManagedAgentsAgentAutoEvaluatedPermissionAllow` The server judged the invocation safe to execute without client approval. - `type: Literal["allow"]` - `class BetaManagedAgentsAgentAutoEvaluatedPermissionAsk` The server reached no judgement; the invocation is held for client approval. - `type: Literal["ask"]` - `reason_code: str` The judgement's grounds in registry-bound terms, for client branching and audit rather than end-user display. Open registry; currently "indeterminate" (no judgement was reached). Clients must tolerate values outside this set. maxLength: 64 - `class BetaManagedAgentsAgentAutoEvaluatedPermissionDeny` The server judged the invocation high-risk; it does not execute and a synthetic error tool result is appended. - `type: Literal["deny"]` - `reason_code: str` The judgement's grounds in registry-bound terms. Open registry; currently "high_risk" (judged high-risk; the call does not run). Clients must tolerate values outside this set. maxLength: 64 - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.tool_confirmation` by `tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentMCPToolResultEvent` Event representing the result of an MCP tool execution. - `type: Literal["agent.mcp_tool_result"]` - `id: str` Unique identifier for this event. - `mcp_tool_use_id: str` The id of the `agent.mcp_tool_use` event this result corresponds to. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent` Event emitted when the agent invokes a built-in agent tool. - `type: Literal["agent.tool_use"]` - `id: str` Unique identifier for this event. - `input: Dict[str, object]` Input parameters for the tool call. - `name: str` Name of the agent tool being used. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `evaluated_permission: Optional[BetaManagedAgentsAgentEvaluatedPermission]` The evaluated permission policy for this tool invocation. - `evaluation: Optional[BetaManagedAgentsAgentToolEvaluation]` Which resolved permission_policy produced evaluated_permission: always_allow, always_ask, or auto (with the server's per-invocation judgement). Absent only when the server refused the call before any policy applied (for example, the named tool is not enabled in the session); such a refusal has evaluated_permission deny. An event recorded before this field existed reads as the arm its evaluated_permission implies (always_allow for allow, always_ask for ask). - `session_thread_id: Optional[str]` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Informational only: the server routes the matching `user.tool_confirmation` or `user.tool_result` by `tool_use_id`, so clients do not send it back. - `class BetaManagedAgentsAgentToolResultEvent` Event representing the result of an agent tool execution. - `type: Literal["agent.tool_result"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `tool_use_id: str` The id of the `agent.tool_use` event this result corresponds to. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentThreadMessageReceivedEvent` Delivery event written to the target thread's input stream when an agent-to-agent message arrives. - `type: Literal["agent.thread_message_received"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Message content blocks. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `from_session_thread_id: str` Public `sthr_` ID of the thread that sent the message. - `processed_at: datetime` Timestamp when the message was received. format: date-time - `from_agent_name: Optional[str]` Name of the callable agent this message came from. Absent when received from the primary agent. - `class BetaManagedAgentsAgentThreadMessageSentEvent` Observability event emitted to the sender's output stream when an agent-to-agent message is sent. - `type: Literal["agent.thread_message_sent"]` - `id: str` Unique identifier for this event. - `content: List[Content]` Message content blocks. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsRedactedBlock` Placeholder for content withheld by Anthropic model policy. - `processed_at: datetime` Timestamp when the message was sent. format: date-time - `to_session_thread_id: str` Public `sthr_` ID of the thread the message was sent to. - `to_agent_name: Optional[str]` Name of the callable agent this message was sent to. Absent when sent to the primary agent. - `class BetaManagedAgentsAgentThreadContextCompactedEvent` Indicates that context compaction (summarization) occurred during the session. - `type: Literal["agent.thread_context_compacted"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when compaction was processed. format: date-time - `class BetaManagedAgentsSessionErrorEvent` An error event indicating a problem occurred during session execution. - `type: Literal["session.error"]` - `id: str` Unique identifier for this event. - `error: Error` - `class BetaManagedAgentsUnknownError` An unknown or unexpected error occurred during session execution. A fallback variant; clients that don't recognize a new error code can match on `retry_status` and `message` alone. - `type: Literal["unknown_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `type: Literal["retrying"]` - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type: Literal["exhausted"]` - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `type: Literal["terminal"]` - `class BetaManagedAgentsModelOverloadedError` The model is currently overloaded. Emitted after automatic retries are exhausted. - `type: Literal["model_overloaded_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsModelRateLimitedError` The model request was rate-limited. - `type: Literal["model_rate_limited_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsModelRequestFailedError` A model request failed for a reason other than overload or rate-limiting. - `type: Literal["model_request_failed_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsMCPConnectionFailedError` Failed to connect to an MCP server. - `type: Literal["mcp_connection_failed_error"]` - `mcp_server_name: str` Name of the MCP server that failed to connect. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsMCPAuthenticationFailedError` Authentication to an MCP server failed. - `type: Literal["mcp_authentication_failed_error"]` - `mcp_server_name: str` Name of the MCP server that failed authentication. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsBillingError` The caller's organization or workspace cannot make model requests — out of credits or spend limit reached. Retrying with the same credentials will not succeed; the caller must resolve the billing state. - `type: Literal["billing_error"]` - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsCredentialHostUnreachableError` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `type: Literal["credential_host_unreachable_error"]` - `credential_id: str` ID of the affected credential. - `message: str` Human-readable error description. - `retry_status: RetryStatus` What the client should do next. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `vault_id: str` ID of the vault containing the affected credential. - `class BetaManagedAgentsRepositoryAuthenticationError` The repository host rejected the credentials, or required credentials and received none. - `type: Literal["repository_authentication_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryForbiddenError` The repository host refused access to the repository. - `type: Literal["repository_forbidden_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryNotFoundError` The repository host reported the repository as not found. - `type: Literal["repository_not_found_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryCheckoutError` The requested branch or commit does not exist in the repository. - `type: Literal["repository_checkout_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `class BetaManagedAgentsRepositoryCloneError` The repository could not be cloned. - `type: Literal["repository_clone_error"]` - `message: str` Human-readable error description. - `repository_url: Optional[str]` URL of the repository that could not be cloned. Null when it could not be identified. - `retry_status: RetryStatus` What the client should do next. Always `retrying`: the session keeps running without the repository. - `class BetaManagedAgentsRetryStatusRetrying` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `processed_at: datetime` Timestamp when the error occurred. format: date-time - `class BetaManagedAgentsSessionStatusRescheduledEvent` Indicates the session is recovering from an error state and is rescheduled for execution. - `type: Literal["session.status_rescheduled"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionStatusRunningEvent` Indicates the session is actively running and the agent is working. - `type: Literal["session.status_running"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionStatusIdleEvent` Indicates the agent has paused and is awaiting user input. - `type: Literal["session.status_idle"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `stop_details: Optional[BetaManagedAgentsSessionRefusalStopDetails]` Structured information about why the session stopped. `null` when there is nothing more to report. - `type: Literal["refusal"]` - `category: Optional[Literal["cyber", "bio", "frontier_llm", 2 more]]` The policy category that triggered the refusal, or `null` when there is no named category. New values can be added over time. - `"cyber"` - `"bio"` - `"frontier_llm"` - `"reasoning_extraction"` - `"general_harms"` - `explanation: Optional[str]` Human-readable explanation of the refusal, or `null` when none is available. The wording can change, so do not parse it. - `stop_reason: StopReason` - `class BetaManagedAgentsSessionEndTurn` The agent completed its turn naturally and is ready for the next user message. - `type: Literal["end_turn"]` - `class BetaManagedAgentsSessionRequiresAction` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `type: Literal["requires_action"]` - `event_ids: List[str]` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `class BetaManagedAgentsSessionRetriesExhausted` The turn ended because repeated errors exhausted the retry budget or an error escalated to `retry_status: 'exhausted'`. - `type: Literal["retries_exhausted"]` - `class BetaManagedAgentsSessionBudgetReached` The agent stopped because the session's tracked list cost reached its budget, or because its usage includes a model with no list price (which the budget cannot measure). Raise the budget to continue — or, if raising is rejected because a model has no list price, remove the budget. - `type: Literal["budget_reached"]` - `class BetaManagedAgentsSessionRefusal` The turn ended because the model's response was refused, for example by a safety classifier. - `type: Literal["refusal"]` - `class BetaManagedAgentsSessionStatusTerminatedEvent` Indicates the session has terminated, either due to an error or completion. - `type: Literal["session.status_terminated"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp of status change. format: date-time - `class BetaManagedAgentsSessionThreadCreatedEvent` Emitted when a child thread is created. Written to the parent thread's output stream so clients observing the session see child creation. - `type: Literal["session.thread_created"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the callable agent the thread runs. - `processed_at: datetime` Timestamp when the thread was created. format: date-time - `session_thread_id: str` Public `sthr_` ID of the newly created thread. - `workflow_run_id: Optional[str]` Identifier of the workflow run that created the thread, or `null` for any other thread. - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent` Emitted when an outcome evaluation cycle begins. - `type: Literal["span.outcome_evaluation_start"]` - `id: str` Unique identifier for this event. - `iteration: int` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. format: int32 - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when outcome evaluation started. format: date-time - `class BetaManagedAgentsSpanOutcomeEvaluationEndEvent` Emitted when an outcome evaluation cycle completes. Carries the verdict and aggregate token usage. A verdict of `needs_revision` means another evaluation cycle follows; `satisfied`, `max_iterations_reached`, `failed`, or `interrupted` are terminal — no further evaluation cycles follow. - `type: Literal["span.outcome_evaluation_end"]` - `id: str` Unique identifier for this event. - `explanation: str` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `iteration: int` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. format: int32 - `outcome_evaluation_start_id: str` The id of the corresponding `span.outcome_evaluation_start` event. - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when outcome evaluation ended. format: date-time - `result: str` Evaluation verdict. 'satisfied': criteria met, session goes idle. 'needs_revision': criteria not met, another revision cycle follows. 'max_iterations_reached': evaluation budget exhausted with criteria still unmet — one final acknowledgment turn follows before the session goes idle, but no further evaluation runs. 'failed': grader determined the rubric does not apply to the deliverables. 'interrupted': user sent an interrupt while evaluation was in progress. - `usage: BetaManagedAgentsSpanModelUsage` Aggregate token usage for this evaluation cycle. Sums across all grader model requests within the cycle. - `cache_creation_input_tokens: int` Tokens used to create prompt cache in this request. format: int32 - `cache_read_input_tokens: int` Tokens read from prompt cache in this request. format: int32 - `input_tokens: int` Input tokens consumed by this request. format: int32 - `output_tokens: int` Output tokens generated by this request. format: int32 - `speed: Optional[Literal["standard", "fast"]]` Inference speed tier this request actually ran at. Mirrors `usage.speed` on /v1/messages. Only present when the fast-mode beta is active. - `"standard"` - `"fast"` - `class BetaManagedAgentsSpanModelRequestStartEvent` Emitted when a model request is initiated by the agent. - `type: Literal["span.model_request_start"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the model request started. format: date-time - `class BetaManagedAgentsSpanModelRequestEndEvent` Emitted when a model request completes. - `type: Literal["span.model_request_end"]` - `id: str` Unique identifier for this event. - `is_error: Optional[bool]` Whether the model request resulted in an error. - `model_request_start_id: str` The id of the corresponding `span.model_request_start` event. - `model_usage: BetaManagedAgentsSpanModelUsage` Token usage for this model request. - `processed_at: datetime` Timestamp when the model request completed. format: date-time - `class BetaManagedAgentsSpanOutcomeEvaluationOngoingEvent` Periodic heartbeat emitted while an outcome evaluation cycle is in progress. Distinguishes 'evaluation is actively running' from 'evaluation is stuck' between the corresponding `span.outcome_evaluation_start` and `span.outcome_evaluation_end` events. - `type: Literal["span.outcome_evaluation_ongoing"]` - `id: str` Unique identifier for this event. - `iteration: int` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. format: int32 - `outcome_id: str` The `outc_` ID of the outcome being evaluated. - `processed_at: datetime` Timestamp when this heartbeat was emitted. format: date-time - `class BetaManagedAgentsUserDefineOutcomeEvent` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `type: Literal["user.define_outcome"]` - `id: str` Unique identifier for this event. - `description: str` What the agent should produce. Copied from the input event. - `max_iterations: Optional[int]` Evaluate-then-revise cycles before giving up. Default 3, max 20. format: int32 - `outcome_id: str` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `processed_at: datetime` Timestamp when the outcome was accepted. format: date-time - `rubric: Rubric` How to grade the outcome. File rubrics are currently resolved to their text content; clients should handle both variants. - `class BetaManagedAgentsFileRubric` Rubric referenced by a file uploaded via the Files API. - `type: Literal["file"]` - `file_id: str` ID of the rubric file. - `class BetaManagedAgentsTextRubric` Rubric content provided inline as text. - `type: Literal["text"]` - `content: str` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `class BetaManagedAgentsSessionDeletedEvent` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `type: Literal["session.deleted"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the session was deleted. format: date-time - `class BetaManagedAgentsSessionThreadStatusRunningEvent` A session thread has begun executing. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_running"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that started running. - `class BetaManagedAgentsSessionThreadStatusIdleEvent` A session thread has yielded and is awaiting input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_idle"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that went idle. - `stop_details: Optional[BetaManagedAgentsSessionRefusalStopDetails]` Structured information about why the thread stopped. `null` when there is nothing more to report. - `stop_reason: StopReason` - `class BetaManagedAgentsSessionEndTurn` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionRequiresAction` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `class BetaManagedAgentsSessionRetriesExhausted` The turn ended because repeated errors exhausted the retry budget or an error escalated to `retry_status: 'exhausted'`. - `class BetaManagedAgentsSessionBudgetReached` The agent stopped because the session's tracked list cost reached its budget, or because its usage includes a model with no list price (which the budget cannot measure). Raise the budget to continue — or, if raising is rejected because a model has no list price, remove the budget. - `class BetaManagedAgentsSessionRefusal` The turn ended because the model's response was refused, for example by a safety classifier. - `class BetaManagedAgentsSessionThreadStatusTerminatedEvent` A session thread has terminated and will accept no further input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_terminated"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that terminated. - `class BetaManagedAgentsUserToolResultEvent` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `type: Literal["user.tool_result"]` - `id: str` Unique identifier for this event. - `tool_use_id: str` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=python#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: Optional[List[Content]]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: Optional[bool]` Whether the tool execution resulted in an error. - `processed_at: Optional[datetime]` Timestamp when this result was processed. format: date-time - `session_thread_id: Optional[str]` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `class BetaManagedAgentsSessionThreadStatusRescheduledEvent` A session thread hit a transient error and is retrying automatically. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `type: Literal["session.thread_status_rescheduled"]` - `id: str` Unique identifier for this event. - `agent_name: str` Name of the agent the thread runs. - `processed_at: datetime` Timestamp of the status transition. format: date-time - `session_thread_id: str` Public sthr_ ID of the thread that is retrying. - `class BetaManagedAgentsSessionUpdatedEvent` Emitted when an UpdateSession request changed at least one field. Carries only the fields that changed; absent fields were not part of the update. The new configuration applies from the next turn. - `type: Literal["session.updated"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the update was applied. format: date-time - `agent: Optional[BetaManagedAgentsSessionAgent]` The session's effective agent configuration after the update. Present only when the update changed `agent` (tools or mcp_servers); when present it is the full materialised snapshot, not a diff. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `"claude-sonnet-5-5"` Efficient model for coding and agents - `"claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `"claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `"claude-sonnet-5"` Efficient model for coding and agents - `"claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-6"` Best combination of speed and intelligence - `"claude-haiku-4-5"` - `"claude-haiku-4-5-20251001"` - `"claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `"claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `"claude-sonnet-4-5"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"` **Deprecated**: Will reach end-of-life on November 30, 2026. Please migrate to claude-sonnet-5-5. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information. High-performance model for agents and coding - `str` - `effort: Optional[Effort]` How hard Claude works on each inference call. One of `low`, `medium`, `high`, `xhigh`, `max`. Always present; resolved to the per-model default at save time when not supplied. - `class BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `type: Literal["low"]` - `class BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `type: Literal["medium"]` - `class BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `type: Literal["high"]` - `class BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `type: Literal["xhigh"]` - `class BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `type: Literal["max"]` - `inference_geo: Optional[str]` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `speed: Optional[Literal["standard", "fast"]]` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Defaults to `standard`. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"` - `"fast"` - `multiagent: Optional[BetaManagedAgentsSessionMultiagent]` Resolved multiagent orchestration configuration. Null when the agent is single-threaded. - `class BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `type: Literal["coordinator"]` - `agents: List[Agent]` Full `agent` definitions the coordinator may spawn as session threads. - `class BetaManagedAgentsSessionThreadAgent` Resolved `agent` definition for a single `session_thread`. Snapshot of the agent at thread creation time. The multiagent roster is not repeated here; read it from `Session.agent`. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `type: Literal["url"]` - `name: str` - `url: str` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type: Literal["anthropic"]` - `skill_id: str` - `version: str` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `type: Literal["custom"]` - `skill_id: str` - `version: str` - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `type: Literal["agent_toolset_20260401"]` - `configs: List[BetaManagedAgentsAgentToolConfig]` - `class BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `type: Literal["bash"]` - `enabled: bool` - `name: Literal["bash"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: Literal["always_allow"]` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: Literal["always_ask"]` - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `type: Literal["auto"]` - `class BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `type: Literal["edit"]` - `enabled: bool` - `name: Literal["edit"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `type: Literal["read"]` - `enabled: bool` - `name: Literal["read"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `type: Literal["write"]` - `enabled: bool` - `name: Literal["write"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `type: Literal["glob"]` - `enabled: bool` - `name: Literal["glob"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `type: Literal["grep"]` - `enabled: bool` - `name: Literal["grep"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `type: Literal["web_fetch"]` - `enabled: bool` - `name: Literal["web_fetch"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `url_sources: Optional[BetaManagedAgentsWebFetchURLSources]` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `client_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type: Literal["all"]` - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `type: Literal["none"]` - `class BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `type: Literal["only"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "none" to allow no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `class BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `type: Literal["except"]` - `tools: List[BetaManagedAgentsWebFetchURLSourceToolReference]` The tools whose results do not contribute. Between 1 and 128 entries, each with a different name. An empty list is rejected; use "all" to leave out no tool's results. - `type: Literal["tool_reference"]` Must be "tool_reference". - `name: str` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `server_tool_results: Optional[BetaManagedAgentsWebFetchURLSourceToolFilter]` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `user_input: Optional[BetaManagedAgentsWebFetchURLSourceUserInput]` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `class BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `class BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `max_content_tokens: Optional[int]` format: int32 - `class BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `type: Literal["web_search"]` - `enabled: bool` - `name: Literal["web_search"]` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `allowed_domains: Optional[List[str]]` - `blocked_domains: Optional[List[str]]` - `user_location: Optional[BetaManagedAgentsUserLocation]` Approximate user location for search result localization. - `type: Literal["approximate"]` Location precision. Only "approximate" is supported. - `city: Optional[str]` City name. minLength: 1, maxLength: 255 - `country: Optional[str]` Two-letter ISO 3166-1 country code, uppercase. - `region: Optional[str]` Region or state name. minLength: 1, maxLength: 255 - `timezone: Optional[str]` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `class BetaManagedAgentsMCPToolset` - `type: Literal["mcp_toolset"]` - `configs: List[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: str` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `class BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `mcp_server_name: str` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: Literal["custom"]` - `description: str` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `type: Literal["object"]` - `properties: Optional[Dict[str, object]]` - `required: Optional[List[str]]` - `name: str` - `version: int` format: int32 - `class BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `type: Literal["advisor"]` - `model: str` The advisor model id. - `class BetaManagedAgentsSessionMultiagent20261001` Resolved multiagent configuration with three members, as copied to the `session` at creation. - `type: Literal["multiagent_20261001"]` - `advisor: BetaManagedAgentsMultiagentAdvisor` Whether the session's primary thread can consult an advisor model. - `class BetaManagedAgentsMultiagentAdvisorEnabled` The session's primary thread can consult `model` mid-turn. - `type: Literal["enabled"]` - `model: str` The advisor model id. - `class BetaManagedAgentsMultiagentAdvisorDisabled` The agent has no advisor. - `type: Literal["disabled"]` - `subagents: BetaManagedAgentsSessionMultiagentSubagents` Whether the agent can spawn session threads. - `class BetaManagedAgentsSessionMultiagentSubagentsEnabled` The agent can spawn session threads. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether the agent can define inline agents, which are not saved, when it spawns session threads. - `class BetaManagedAgentsMultiagentInlineAgentsEnabled` The agent can define inline agents. - `type: Literal["enabled"]` - `class BetaManagedAgentsMultiagentInlineAgentsDisabled` The agent cannot define inline agents. - `type: Literal["disabled"]` - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that this agent can spawn as session threads. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentSubagentsDisabled` The agent cannot spawn session threads. - `type: Literal["disabled"]` - `workflows: BetaManagedAgentsSessionMultiagentWorkflows` Whether the agent can start workflow runs. - `class BetaManagedAgentsSessionMultiagentWorkflowsEnabled` The agent can start workflow runs. - `type: Literal["enabled"]` - `inline_agents: BetaManagedAgentsMultiagentInlineAgents` Whether a run's plan can define inline agents, which are not saved. - `predefined_agents: List[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions of the predefined agents, which are saved agents that a run's plan can use. - `type: Literal["agent"]` - `id: str` - `description: Optional[str]` - `mcp_servers: List[BetaManagedAgentsMCPServerURLDefinition]` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: str` - `skills: List[Skill]` - `system: Optional[str]` - `tools: List[Tool]` - `version: int` format: int32 - `class BetaManagedAgentsMultiagentWorkflowsDisabled` The agent cannot start workflow runs. - `type: Literal["disabled"]` - `name: str` - `skills: List[Skill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system: Optional[str]` - `tools: List[Tool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `version: int` format: int32 - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's budget after the update: the new budget when set or replaced, or null when the update removed it. Present only when the update changed the budget. - `type: Literal["limit"]` - `max_list_cost: BetaMonetaryAmount` Maximum list cost the session may accrue. List price is used regardless of any negotiated discount, so the cap fires at or before the actual charge. - `amount: str` Amount in minor units of the currency, as an integer decimal string with no leading zeros: "2500" is $25.00 and "50" is fifty cents. A string rather than a number so no float rounding is ever applied. - `currency: BetaCurrency` Uppercase ISO-4217 currency code. `USD` is the only currency currently supported; the accepted set is closed and grows only when a new currency is priced. - `metadata: Optional[Dict[str, str]]` The session's full metadata bag after the update. Present when the update set non-empty metadata; absent when metadata was unchanged or cleared to empty. - `title: Optional[str]` The session's new title. Present only when the update changed it. - `class BetaManagedAgentsStartEvent` Opens a preview of a buffered event. Carries the previewed event's type and id only. Followed by zero or more event_delta events with the same event id, normally concluded by the buffered event carrying that id. If the producing model request ends without that event (an error or interrupt mid-stream), its terminal span.model_request_end closes the preview. Only sent on stream connections that opt in via event_deltas; never appears in event history. - `type: Literal["event_start"]` - `event: BetaManagedAgentsStartEventPreview` The previewed event's type and id. The event type determines which delta types the preview's event_delta events carry: agent.message events stream content_delta fragments; agent.thinking previews are start-only — no deltas follow, and the buffered agent.thinking with the same id concludes them. - `class BetaManagedAgentsAgentMessagePreview` - `type: Literal["agent.message"]` - `id: str` The id the buffered agent.message will carry if it is emitted. Matches the event_id on this preview's event_delta events. - `class BetaManagedAgentsAgentThinkingPreview` - `type: Literal["agent.thinking"]` - `id: str` The id the buffered agent.thinking will carry if it is emitted. Start-only — no event_delta events follow. - `class BetaManagedAgentsDeltaEvent` An incremental update to an event that is still being streamed. Deltas are best-effort and may stop early; when the buffered event with id == event_id is produced it carries the complete content. A model request that ends early (an error or interrupt) produces no buffered event — its terminal span.model_request_end closes the preview. Only sent on stream connections that opt in via event_deltas; never appears in event history. - `type: Literal["event_delta"]` - `delta: BetaManagedAgentsDeltaContent` One fragment of the previewed event. The delta type is named for the previewed event's field it streams into: agent.message events stream content_delta fragments, each a partial element of the content array. - `type: Literal["content_delta"]` - `content: BetaManagedAgentsTextBlock` A partial element of the content array at index, typed like the element itself — the same shape the buffered agent.message carries in content. - `index: Optional[int]` Which entry in the previewed event's content array this fragment lands in. Insert content as that entry when the index is new; append to the existing entry otherwise. - `event_id: str` The id of the event being previewed. Matches event.id on the corresponding event_start and the buffered event that reconciles the preview. - `class BetaManagedAgentsSystemMessageEvent` A mid-conversation system message event. Carries system-role content that is appended to the session as a `role: "system"` turn. - `type: Literal["system.message"]` - `id: str` Unique identifier for this event. - `content: List[BetaManagedAgentsSystemContentBlock]` System content blocks. Text-only. - `type: Literal["text"]` - `text: str` The text content. minLength: 1 - `processed_at: Optional[datetime]` Timestamp when this system message was processed. format: date-time - `class BetaManagedAgentsSessionUsageEvent` Periodic snapshot of the session's cumulative usage and tracked list cost. - `type: Literal["session.usage"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when the snapshot was taken. format: date-time - `usage: BetaManagedAgentsSessionUsageSnapshot` The session's cumulative usage at the snapshot time. - `active_seconds: Optional[float]` Cumulative time in seconds during which the session had at least one thread in running status. Overlapping activity from concurrent threads is counted once. This is the duration the session's runtime cost is priced on. format: double - `cache_creation: Optional[BetaManagedAgentsCacheCreationUsage]` Tokens used to create prompt cache entries, broken down by cache TTL. - `ephemeral_1h_input_tokens: Optional[int]` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `ephemeral_5m_input_tokens: Optional[int]` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `cache_read_input_tokens: Optional[int]` Total tokens read from prompt cache. format: int32 - `input_tokens: Optional[int]` Total input tokens consumed across all turns. format: int32 - `list_cost: Optional[BetaMonetaryAmount]` Cumulative list cost of the session across all turns, priced at public list rates. - `output_tokens: Optional[int]` Total output tokens generated across all turns. format: int32 - `server_tool_use: Optional[BetaManagedAgentsServerToolUsage]` Cumulative server-executed tool usage across all turns. - `web_fetch_requests: Optional[int]` Number of server-executed web fetch requests. format: int32 - `web_search_requests: Optional[int]` Number of server-executed web search requests. format: int32 - `budget: Optional[BetaManagedAgentsBudgetLimit]` The session's configured budget at the snapshot time, or null when the session has no budget. - `class BetaManagedAgentsWorkflowRunCreatedEvent` A workflow run was created. A workflow run is background work that the session's agent starts. Emitted once per run, before the run's other `workflow_run.*` events. - `type: Literal["workflow_run.created"]` - `id: str` Unique identifier for this event. - `description: Optional[str]` Description that the agent gave the run, passed on as written, or `null` if it gave none. - `name: str` Name that the agent gave the run, passed on as written, or a name that the server assigned. - `phases: List[BetaManagedAgentsWorkflowRunPhase]` The phases that the run's plan declares, in the plan's order. Can be empty. - `id: str` Unique identifier for the phase. - `description: Optional[str]` Description that the agent gave the phase, passed on as written, or `null` if it gave none. - `name: str` Name that the agent gave the phase, passed on as written. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunStatusEndedEvent` A workflow run ended. Emitted once per run, as the last of the run's `workflow_run.*` events. - `type: Literal["workflow_run.status_ended"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `result: BetaManagedAgentsWorkflowRunResult` How the run ended. - `class BetaManagedAgentsWorkflowRunResultCompleted` The run's plan, a program that the agent wrote, finished. This does not say whether the work succeeded. - `type: Literal["completed"]` - `class BetaManagedAgentsWorkflowRunResultError` The run failed or reached its time limit. - `type: Literal["error"]` - `error: BetaManagedAgentsWorkflowRunError` Why the run did not finish. - `class BetaManagedAgentsTimeoutWorkflowRunError` The run reached its time limit. - `type: Literal["timeout_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsProgramWorkflowRunError` The plan, a program that the agent wrote, failed, or the server refused it. - `type: Literal["program_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsUnknownWorkflowRunError` A failure that has no type of its own. - `type: Literal["unknown_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsThreadLimitWorkflowRunError` The run exceeded the limit on the number of threads that a run can create. - `type: Literal["thread_limit_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsMaxWorkflowRunsWorkflowRunError` No run was created, because the session was at its limit of open workflow runs, which are runs that have not ended. Only `workflow_run.error` carries this type. - `type: Literal["max_workflow_runs_error"]` - `message: str` Short explanation written by the server. It never contains content from the run or its agents. - `class BetaManagedAgentsWorkflowRunResultStopped` The agent stopped the run. - `type: Literal["stopped"]` - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunPhaseStartedEvent` A workflow run's plan entered a phase. - `type: Literal["workflow_run.phase_started"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `workflow_run_phase_id: str` Identifier of the phase, as in `phases` on the run's `workflow_run.created` event. - `class BetaManagedAgentsWorkflowRunPhaseEndedEvent` A workflow run's plan left a phase, or the run's end closed it. Emitted once for every `workflow_run.phase_started` event, before the run's `workflow_run.status_ended` event. The event does not say whether the plan finished the phase's work, or why it left. - `type: Literal["workflow_run.phase_ended"]` - `id: str` Unique identifier for this event. - `phase_started_id: str` Identifier of the `workflow_run.phase_started` event that opened the phase. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `workflow_run_phase_id: str` Identifier of the phase, as in `phases` on the run's `workflow_run.created` event. - `class BetaManagedAgentsWorkflowRunStatusRunningEvent` A workflow run is running. Emitted when the run starts to execute, and each time it resumes after being idle. A run that starts idle emits `workflow_run.status_idle` first. - `type: Literal["workflow_run.status_running"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunStatusIdleEvent` A workflow run is idle. Emitted each time the run goes idle, whatever the cause. If the run ends while idle, no `workflow_run.status_running` comes between this event and its `workflow_run.status_ended`. - `type: Literal["workflow_run.status_idle"]` - `id: str` Unique identifier for this event. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: str` Identifier of the run. The same value is on all of the run's `workflow_run.*` events. - `class BetaManagedAgentsWorkflowRunErrorEvent` A workflow run met an error, or an error kept a run from being created. A run that ends with a `result.type` of `error` emits this event before its `workflow_run.status_ended`, with the same `error`. - `type: Literal["workflow_run.error"]` - `id: str` Unique identifier for this event. - `error: BetaManagedAgentsWorkflowRunError` Why the run did not finish, or was not created. - `processed_at: datetime` Timestamp when this event was processed. format: date-time - `workflow_run_id: Optional[str]` Identifier of the run that met the error, or `null` when the error kept a run from being created. #### Example ```python import os from anthropic import Anthropic client = Anthropic( api_key=os.environ.get( "ANTHROPIC_API_KEY" ), # This is the default and can be omitted ) for event in client.beta.sessions.threads.events.stream( thread_id="sthr_011CZkZVWa6oJjw1rgXZpnBt", session_id="sesn_011CZkZAtmR3yMPDzynEDxu7", ): print(event) ``` ##### Response (200) ```json { "id": "sevt_011CZkZGPp1iBcp4kaQSihUm", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ```