--- title: List Session Threads url: https://platform.claude.com/docs/en/api/go/beta/sessions/threads/list --- # List Session Threads `client.Beta.Sessions.Threads.List(ctx, sessionID, params) (*PageCursor[BetaManagedAgentsSessionThread], error)` **GET** `/v1/sessions/{session_id}/threads` List Session Threads ## Parameters - `sessionID string` (path parameter) - `params BetaSessionThreadListParams` - `Limit param.Opt[int64] Optional` (query parameter) Maximum results per page. Defaults to 1000. format: int32 - `Page param.Opt[string] Optional` (query parameter) Opaque pagination cursor from a previous response's `next_page`. Forward-only. - `Statuses []BetaManagedAgentsSessionThreadStatus Optional` (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. - `const BetaManagedAgentsSessionThreadStatusRunning BetaManagedAgentsSessionThreadStatus = "running"` - `const BetaManagedAgentsSessionThreadStatusIdle BetaManagedAgentsSessionThreadStatus = "idle"` - `const BetaManagedAgentsSessionThreadStatusRescheduling BetaManagedAgentsSessionThreadStatus = "rescheduling"` - `const BetaManagedAgentsSessionThreadStatusTerminated BetaManagedAgentsSessionThreadStatus = "terminated"` - `Betas []AnthropicBeta Optional` (header parameter) This endpoint is in beta: requests must send `managed-agents-2026-04-01` in this header. - `const AnthropicBetaMessageBatches2024_09_24 AnthropicBeta = "message-batches-2024-09-24"` - `const AnthropicBetaPromptCaching2024_07_31 AnthropicBeta = "prompt-caching-2024-07-31"` - `const AnthropicBetaComputerUse2024_10_22 AnthropicBeta = "computer-use-2024-10-22"` - `const AnthropicBetaComputerUse2025_01_24 AnthropicBeta = "computer-use-2025-01-24"` - `const AnthropicBetaPDFs2024_09_25 AnthropicBeta = "pdfs-2024-09-25"` - `const AnthropicBetaTokenCounting2024_11_01 AnthropicBeta = "token-counting-2024-11-01"` - `const AnthropicBetaTokenEfficientTools2025_02_19 AnthropicBeta = "token-efficient-tools-2025-02-19"` - `const AnthropicBetaOutput128k2025_02_19 AnthropicBeta = "output-128k-2025-02-19"` - `const AnthropicBetaFilesAPI2025_04_14 AnthropicBeta = "files-api-2025-04-14"` - `const AnthropicBetaMCPClient2025_04_04 AnthropicBeta = "mcp-client-2025-04-04"` - `const AnthropicBetaMCPClient2025_11_20 AnthropicBeta = "mcp-client-2025-11-20"` - `const AnthropicBetaDevFullThinking2025_05_14 AnthropicBeta = "dev-full-thinking-2025-05-14"` - `const AnthropicBetaInterleavedThinking2025_05_14 AnthropicBeta = "interleaved-thinking-2025-05-14"` - `const AnthropicBetaCodeExecution2025_05_22 AnthropicBeta = "code-execution-2025-05-22"` - `const AnthropicBetaExtendedCacheTTL2025_04_11 AnthropicBeta = "extended-cache-ttl-2025-04-11"` - `const AnthropicBetaContext1m2025_08_07 AnthropicBeta = "context-1m-2025-08-07"` - `const AnthropicBetaContextManagement2025_06_27 AnthropicBeta = "context-management-2025-06-27"` - `const AnthropicBetaModelContextWindowExceeded2025_08_26 AnthropicBeta = "model-context-window-exceeded-2025-08-26"` - `const AnthropicBetaSkills2025_10_02 AnthropicBeta = "skills-2025-10-02"` - `const AnthropicBetaFastMode2026_02_01 AnthropicBeta = "fast-mode-2026-02-01"` - `const AnthropicBetaOutput300k2026_03_24 AnthropicBeta = "output-300k-2026-03-24"` - `const AnthropicBetaUserProfiles2026_03_24 AnthropicBeta = "user-profiles-2026-03-24"` - `const AnthropicBetaUserProfiles2026_08_18 AnthropicBeta = "user-profiles-2026-08-18"` - `const AnthropicBetaUserProfiles2026_09_04 AnthropicBeta = "user-profiles-2026-09-04"` - `const AnthropicBetaAdvisorTool2026_03_01 AnthropicBeta = "advisor-tool-2026-03-01"` - `const AnthropicBetaManagedAgents2026_04_01 AnthropicBeta = "managed-agents-2026-04-01"` - `const AnthropicBetaCacheDiagnosis2026_04_07 AnthropicBeta = "cache-diagnosis-2026-04-07"` - `const AnthropicBetaDreaming2026_04_21 AnthropicBeta = "dreaming-2026-04-21"` - `const AnthropicBetaThinkingTokenCount2026_05_13 AnthropicBeta = "thinking-token-count-2026-05-13"` - `const AnthropicBetaServerSideFallback2026_06_01 AnthropicBeta = "server-side-fallback-2026-06-01"` - `const AnthropicBetaServerSideFallback2026_07_01 AnthropicBeta = "server-side-fallback-2026-07-01"` - `const AnthropicBetaFallbackCredit2026_06_01 AnthropicBeta = "fallback-credit-2026-06-01"` - `const AnthropicBetaFallbackCredit2026_07_01 AnthropicBeta = "fallback-credit-2026-07-01"` - `const AnthropicBetaAgentMemory2026_07_22 AnthropicBeta = "agent-memory-2026-07-22"` - `const AnthropicBetaMidConversationToolChanges2026_07_01 AnthropicBeta = "mid-conversation-tool-changes-2026-07-01"` - `const AnthropicBetaCompact2026_01_12 AnthropicBeta = "compact-2026-01-12"` - `const AnthropicBetaComputerUse2025_11_24 AnthropicBeta = "computer-use-2025-11-24"` - `const AnthropicBetaMCPTunnels2026_06_22 AnthropicBeta = "mcp-tunnels-2026-06-22"` - `const AnthropicBetaStructuredOutputs2025_11_13 AnthropicBeta = "structured-outputs-2025-11-13"` - `const AnthropicBetaTaskBudgets2026_03_13 AnthropicBeta = "task-budgets-2026-03-13"` - `const AnthropicBetaThinkingDisplayUpdates2026_08_18 AnthropicBeta = "thinking-display-updates-2026-08-18"` - `const AnthropicBetaCEUserManagement2026_07_13 AnthropicBeta = "ce-user-management-2026-07-13"` - `const AnthropicBetaMidConversationOutputConfig2026_07_01 AnthropicBeta = "mid-conversation-output-config-2026-07-01"` - `const AnthropicBetaThinkingBindingControls2026_08_01 AnthropicBeta = "thinking-binding-controls-2026-08-01"` - `const AnthropicBetaMidConversationSystemClearAt2026_08_21 AnthropicBeta = "mid-conversation-system-clear-at-2026-08-21"` - `const AnthropicBetaCompact2026_09_04 AnthropicBeta = "compact-2026-09-04"` - `const AnthropicBetaInlineTools2026_09_15 AnthropicBeta = "inline-tools-2026-09-15"` - `const AnthropicBetaMCPClient2026_09_15 AnthropicBeta = "mcp-client-2026-09-15"` - `const AnthropicBetaCEPlugins2026_09_01 AnthropicBeta = "ce-plugins-2026-09-01"` - `const AnthropicBetaSpendLimitReads2026_09_26 AnthropicBeta = "spend-limit-reads-2026-09-26"` - `const AnthropicBetaTelemetryDestinations2026_08_11 AnthropicBeta = "telemetry-destinations-2026-08-11"` - `WorkspaceID param.Opt[string] Optional` (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 BetaManagedAgentsSessionThread` An execution thread within a `session`. Each session has one primary thread plus zero or more child threads. - `Type BetaManagedAgentsSessionThreadType` - `ID string` Unique identifier for this thread. - `Agent BetaManagedAgentsSessionThreadAgentUnion` Resolved agent definition for this thread. Snapshot of the agent at thread creation time. - `type 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 BetaManagedAgentsSessionThreadAgentType` - `ID string` - `Description string` - `ExecutionIdentity BetaManagedAgentsExecutionIdentityUnion` Execution principal snapshotted from the agent at session creation. Always present; `{"type": "service_account"}` when runs carry no customer-named principal. - `type BetaManagedAgentsAWSRoleExecutionIdentity` An AWS IAM role principal as returned in API responses. - `Type AWSRole` - `RoleARN string` The IAM role's ARN. - `type BetaManagedAgentsServiceAccountExecutionIdentity` The Anthropic-managed service account as returned in API responses. - `Type ServiceAccount` - `MCPServers []BetaManagedAgentsMCPServerURLDefinition` - `Type BetaManagedAgentsMCPServerURLDefinitionType` - `Name string` - `URL string` - `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. - `const BetaManagedAgentsModelClaudeHaiku5_5 BetaManagedAgentsModel = "claude-haiku-5-5"` Fastest model for high-volume, real-time tasks - `const BetaManagedAgentsModelClaudeSonnet5_5 BetaManagedAgentsModel = "claude-sonnet-5-5"` Efficient model for coding and agents - `const BetaManagedAgentsModelClaudeOpus5_5 BetaManagedAgentsModel = "claude-opus-5-5"` Powerful intelligence for coding, knowledge work, and long-running agents - `const BetaManagedAgentsModelClaudeFable5_1 BetaManagedAgentsModel = "claude-fable-5-1"` Frontier intelligence for ambitious tasks across coding, scientific discovery, and enterprise workflows - `const BetaManagedAgentsModelClaudeSonnet5 BetaManagedAgentsModel = "claude-sonnet-5"` Efficient model for coding and agents - `const BetaManagedAgentsModelClaudeFable5 BetaManagedAgentsModel = "claude-fable-5"` Next generation of intelligence for the hardest knowledge work and coding problems - `const BetaManagedAgentsModelClaudeOpus5 BetaManagedAgentsModel = "claude-opus-5"` Powerful intelligence for long-running agents and coding - `const BetaManagedAgentsModelClaudeOpus4_8 BetaManagedAgentsModel = "claude-opus-4-8"` Powerful intelligence for long-running agents and coding - `const BetaManagedAgentsModelClaudeOpus4_7 BetaManagedAgentsModel = "claude-opus-4-7"` Powerful intelligence for long-running agents and coding - `const BetaManagedAgentsModelClaudeOpus4_6 BetaManagedAgentsModel = "claude-opus-4-6"` Powerful intelligence for long-running agents and coding - `const BetaManagedAgentsModelClaudeSonnet4_6 BetaManagedAgentsModel = "claude-sonnet-4-6"` Best combination of speed and intelligence - `const BetaManagedAgentsModelClaudeHaiku4_5 BetaManagedAgentsModel = "claude-haiku-4-5"` - `const BetaManagedAgentsModelClaudeHaiku4_5_20251001 BetaManagedAgentsModel = "claude-haiku-4-5-20251001"` - `const BetaManagedAgentsModelClaudeOpus4_5 BetaManagedAgentsModel = "claude-opus-4-5"` Powerful intelligence for long-running agents and coding - `const BetaManagedAgentsModelClaudeOpus4_5_20251101 BetaManagedAgentsModel = "claude-opus-4-5-20251101"` Powerful intelligence for long-running agents and coding - `const BetaManagedAgentsModelClaudeSonnet4_5 BetaManagedAgentsModel = "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 - `const BetaManagedAgentsModelClaudeSonnet4_5_20250929 BetaManagedAgentsModel = "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 - `Effort BetaManagedAgentsModelConfigEffortUnion Optional` 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. - `type BetaManagedAgentsEffortLow` Low effort. Favors latency over reasoning depth. - `Type BetaManagedAgentsEffortLowType` - `type BetaManagedAgentsEffortMedium` Medium effort. Balances latency and reasoning depth. - `Type BetaManagedAgentsEffortMediumType` - `type BetaManagedAgentsEffortHigh` High effort. Favors reasoning depth. - `Type BetaManagedAgentsEffortHighType` - `type BetaManagedAgentsEffortXhigh` Extra-high effort. Not all models accept this level. - `Type BetaManagedAgentsEffortXhighType` - `type BetaManagedAgentsEffortMax` Maximum effort. Favors reasoning depth over latency. - `Type BetaManagedAgentsEffortMaxType` - `InferenceGeo string Optional` Geographic region for model inference. When unset, requests fall through to the workspace's default_inference_geo. - `Speed BetaManagedAgentsModelConfigSpeed Optional` 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. - `const BetaManagedAgentsModelConfigSpeedStandard BetaManagedAgentsModelConfigSpeed = "standard"` - `const BetaManagedAgentsModelConfigSpeedFast BetaManagedAgentsModelConfigSpeed = "fast"` - `Name string` - `Skills []BetaManagedAgentsSessionThreadAgentSkillUnion` - `type BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `Type BetaManagedAgentsAnthropicSkillType` - `SkillID string` - `Version string` - `type BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `Type BetaManagedAgentsCustomSkillType` - `SkillID string` - `Version string` - `System string` - `Tools []BetaManagedAgentsSessionThreadAgentToolUnion` - `type BetaManagedAgentsAgentToolset20260401` - `Type BetaManagedAgentsAgentToolset20260401Type` - `Configs []BetaManagedAgentsAgentToolConfigUnion` - `type BetaManagedAgentsBashToolConfig` Configuration for the bash tool. - `Type Bash` - `Enabled bool` - `Name Bash` - `PermissionPolicy BetaManagedAgentsBashToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `Type BetaManagedAgentsAlwaysAllowPolicyType` - `type BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `Type BetaManagedAgentsAlwaysAskPolicyType` - `type BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it 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 Auto` - `type BetaManagedAgentsEditToolConfig` Configuration for the edit tool. - `Type Edit` - `Enabled bool` - `Name Edit` - `PermissionPolicy BetaManagedAgentsEditToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it 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 BetaManagedAgentsReadToolConfig` Configuration for the read tool. - `Type Read` - `Enabled bool` - `Name Read` - `PermissionPolicy BetaManagedAgentsReadToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it 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 BetaManagedAgentsWriteToolConfig` Configuration for the write tool. - `Type Write` - `Enabled bool` - `Name Write` - `PermissionPolicy BetaManagedAgentsWriteToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it 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 BetaManagedAgentsGlobToolConfig` Configuration for the glob tool. - `Type Glob` - `Enabled bool` - `Name Glob` - `PermissionPolicy BetaManagedAgentsGlobToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it 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 BetaManagedAgentsGrepToolConfig` Configuration for the grep tool. - `Type Grep` - `Enabled bool` - `Name Grep` - `PermissionPolicy BetaManagedAgentsGrepToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it 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 BetaManagedAgentsWebFetchToolConfig` Configuration for the web_fetch tool. - `Type WebFetch` - `Enabled bool` - `Name WebFetch` - `PermissionPolicy BetaManagedAgentsWebFetchToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `URLSources BetaManagedAgentsWebFetchURLSources` Which sources contribute URLs the tool may fetch, always in the object form. Null when not set, which allows every source. - `ClientToolResults BetaManagedAgentsWebFetchURLSourceToolFilterUnion` Which custom tools' results contribute URLs that may be fetched. Null when not set, which allows every custom tool's results. - `type BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `Type All` - `type BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `Type None` - `type BetaManagedAgentsWebFetchURLSourceOnly` Only the named tools' results contribute URLs that may be fetched. - `Type Only` - `Tools []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 ToolReference` Must be "tool_reference". - `Name string` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `type BetaManagedAgentsWebFetchURLSourceExcept` Every tool's results contribute URLs that may be fetched, except the named tools' results. - `Type Except` - `Tools []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 ToolReference` Must be "tool_reference". - `Name string` Name of the tool. Compared exactly, so upper and lower case letters are different. minLength: 1, maxLength: 128 - `ServerToolResults BetaManagedAgentsWebFetchURLSourceToolFilterUnion` Which of the web_search and web_fetch tools' results contribute URLs that may be fetched. Null when not set, which allows both. - `UserInput BetaManagedAgentsWebFetchURLSourceUserInputUnion` Whether URLs in the text of user messages may be fetched. Null when not set, which allows them. - `type BetaManagedAgentsWebFetchURLSourceAll` Every URL from this source may be fetched. This is the default. - `type BetaManagedAgentsWebFetchURLSourceNone` This source contributes no URLs that may be fetched. - `AllowedDomains []string Optional` - `BlockedDomains []string Optional` - `MaxContentTokens int64 Optional` format: int32 - `type BetaManagedAgentsWebSearchToolConfig` Configuration for the web_search tool. - `Type WebSearch` - `Enabled bool` - `Name WebSearch` - `PermissionPolicy BetaManagedAgentsWebSearchToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `AllowedDomains []string Optional` - `BlockedDomains []string Optional` - `UserLocation BetaManagedAgentsUserLocation Optional` Approximate user location for search result localization. - `Type Approximate` Location precision. Only "approximate" is supported. - `City string Optional` City name. minLength: 1, maxLength: 255 - `Country string Optional` Two-letter ISO 3166-1 country code, uppercase. - `Region string Optional` Region or state name. minLength: 1, maxLength: 255 - `Timezone string Optional` IANA timezone identifier, e.g. "America/Los_Angeles". minLength: 1, maxLength: 255 - `DefaultConfig BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `Enabled bool` - `PermissionPolicy BetaManagedAgentsAgentToolsetDefaultConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it 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 BetaManagedAgentsMCPToolset` - `Type BetaManagedAgentsMCPToolsetType` - `Configs []BetaManagedAgentsMCPToolConfig` - `Enabled bool` - `Name string` - `PermissionPolicy BetaManagedAgentsMCPToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `DefaultConfig BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `Enabled bool` - `PermissionPolicy BetaManagedAgentsMCPToolsetDefaultConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type BetaManagedAgentsAutoPolicy` The server decides each tool call individually: it judges, from the tool, its input, and the session content so far, whether the call is safe to execute or high-risk, and evaluates it to allow when judged safe and to deny when judged high-risk. A call the server cannot reach a judgement on evaluates to ask. - `MCPServerName string` - `type BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `Type BetaManagedAgentsCustomToolType` - `Description string` - `InputSchema BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `Type Object` - `Properties map[string, any] Optional` - `Required []string Optional` - `Name string` - `Version int64` format: int32 - `type BetaManagedAgentsAdvisor` Platform advisor roster entry: a model the session's primary thread may consult mid-turn. - `Type BetaManagedAgentsAdvisorType` - `Model string` The advisor model id. - `type 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 Inline` - `Description string` - `ExecutionIdentity BetaManagedAgentsExecutionIdentityUnion` The session's execution principal. - `MCPServers []BetaManagedAgentsMCPServerURLDefinition` - `Type BetaManagedAgentsMCPServerURLDefinitionType` - `Name string` - `URL string` - `Model BetaManagedAgentsModelConfig` Model identifier and configuration. - `Name string` The name that the agent's definition gave, or one that the server assigned. - `Skills []BetaManagedAgentsInlineAgentSkillUnion` - `type BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `type BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `System string` - `Tools []BetaManagedAgentsInlineAgentToolUnion` - `type BetaManagedAgentsAgentToolset20260401` - `type BetaManagedAgentsMCPToolset` - `type BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `ArchivedAt Time` When the thread was archived. Null if not archived. format: date-time - `CreatedAt Time` When the thread was created. format: date-time - `ParentThreadID string` Parent thread that spawned this thread. Null for the primary thread. - `SessionID string` The session this thread belongs to. - `Stats BetaManagedAgentsSessionThreadStats` Timing statistics for this thread. Null until the thread's first status transition. - `ActiveSeconds float64 Optional` Cumulative time in seconds the thread spent actively running. Excludes idle time. format: double - `DurationSeconds float64 Optional` Elapsed time since thread creation in seconds. For archived threads, frozen at the final update. format: double - `StartupSeconds float64 Optional` 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. - `const BetaManagedAgentsSessionThreadStatusRunning BetaManagedAgentsSessionThreadStatus = "running"` - `const BetaManagedAgentsSessionThreadStatusIdle BetaManagedAgentsSessionThreadStatus = "idle"` - `const BetaManagedAgentsSessionThreadStatusRescheduling BetaManagedAgentsSessionThreadStatus = "rescheduling"` - `const BetaManagedAgentsSessionThreadStatusTerminated BetaManagedAgentsSessionThreadStatus = "terminated"` - `UpdatedAt Time` When the thread was last updated. format: date-time - `Usage BetaManagedAgentsSessionThreadUsage` Cumulative token usage for this thread. Null until the thread's first idle transition. - `ActiveSeconds float64 Optional` 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 - `CacheCreation BetaManagedAgentsCacheCreationUsage Optional` Tokens used to create prompt cache entries, broken down by cache TTL. - `Ephemeral1hInputTokens int64 Optional` Tokens used to create 1-hour ephemeral cache entries. format: int32 - `Ephemeral5mInputTokens int64 Optional` Tokens used to create 5-minute ephemeral cache entries. format: int32 - `CacheReadInputTokens int64 Optional` Total tokens read from prompt cache. format: int32 - `InputTokens int64 Optional` Total input tokens consumed across all turns. format: int32 - `ListCost BetaMonetaryAmount Optional` 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 string` 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. - `OutputTokens int64 Optional` Total output tokens generated across all turns. format: int32 - `ServerToolUse BetaManagedAgentsServerToolUsage Optional` Cumulative server-executed tool usage across all turns of this thread. Absent until server-tool tracking is available for the thread. - `WebFetchRequests int64 Optional` Number of server-executed web fetch requests. format: int32 - `WebSearchRequests int64 Optional` Number of server-executed web search requests. format: int32 - `WorkflowRunID string` Identifier of the workflow run that created the thread, or `null` for any other thread. ## Example ```go package main import ( "context" "fmt" "github.com/anthropics/anthropic-sdk-go" "github.com/anthropics/anthropic-sdk-go/option" ) func main() { client := anthropic.NewClient( option.WithAPIKey("my-anthropic-api-key"), ) page, err := client.Beta.Sessions.Threads.List( context.TODO(), "sesn_011CZkZAtmR3yMPDzynEDxu7", anthropic.BetaSessionThreadListParams{}, ) if err != nil { panic(err.Error()) } fmt.Printf("%+v\n", page) } ``` ### Response (200) ```json { "data": [ { "id": "sthr_011CZkZVWa6oJjw1rgXZpnBt", "agent": { "id": "agent_011CZkYqphY8vELVzwCUpqiQ", "description": "A focused research subagent.", "execution_identity": { "type": "service_account" }, "mcp_servers": [ { "name": "example-mcp", "type": "url", "url": "https://example-server.modelcontextprotocol.io/sse" } ], "model": { "id": "claude-opus-5-5", "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=" } ```