# Sessions ## Create Session `BetaManagedAgentsSession Beta.Sessions.Create(SessionCreateParamsparameters, CancellationTokencancellationToken = default)` **post** `/v1/sessions` Create Session ### Parameters - `SessionCreateParams parameters` - `required Agent agent` Body param: 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. - `string` - `class BetaManagedAgentsAgentParams:` Specification for an Agent. Provide a specific `version` or use the short-form `agent="agent_id"` for the most recent version - `required string ID` The `agent` ID. - `required Type Type` - `"agent"Agent` - `Int Version` The specific `agent` version to use. Omit to use the latest version. Must be at least 1 if specified. - `required string environmentID` Body param: ID of the `environment` defining the container configuration for this session. - `IReadOnlyDictionary metadata` Body param: Arbitrary key-value metadata attached to the session. Maximum 16 pairs, keys up to 64 chars, values up to 512 chars. - `IReadOnlyList resources` Body param: Resources (e.g. repositories, files) to mount into the session's container. - `class BetaManagedAgentsGitHubRepositoryResourceParams:` Mount a GitHub repository into the session's container. - `required string AuthorizationToken` GitHub authorization token used to clone the repository. - `required Type Type` - `"github_repository"GitHubRepository` - `required string Url` Github URL of the repository - `Checkout? Checkout` Branch or commit to check out. Defaults to the repository's default branch. - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `string? MountPath` Mount path in the container. Defaults to `/workspace/`. - `class BetaManagedAgentsFileResourceParams:` Mount a file uploaded via the Files API into the session. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `string? MountPath` Mount path in the container. Defaults to `/mnt/session/uploads/`. - `class BetaManagedAgentsMemoryStoreResourceParam:` Parameters for attaching a memory store to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? title` Body param: Human-readable session title. - `IReadOnlyList vaultIds` Body param: Vault IDs for stored credentials the agent can use during the session. - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsSession:` A Managed Agents `session`. - `required string ID` - `required BetaManagedAgentsSessionAgent Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `required DateTimeOffset? ArchivedAt` A timestamp in RFC 3339 format - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string EnvironmentID` - `required IReadOnlyDictionary Metadata` - `required IReadOnlyList OutcomeEvaluations` Per-outcome evaluation state. One entry per define_outcome event sent to the session. - `required DateTimeOffset? CompletedAt` A timestamp in RFC 3339 format - `required string Description` What the agent should produce. - `required string? Explanation` 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. - `required Int Iteration` 0-indexed revision cycle the outcome is currently on. - `required string OutcomeID` Server-generated outc_ ID for this outcome. - `required string Result` 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. - `required Type Type` - `"outcome_evaluation"OutcomeEvaluation` - `required IReadOnlyList Resources` - `class BetaManagedAgentsGitHubRepositoryResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string MountPath` - `required Type Type` - `"github_repository"GitHubRepository` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required string Url` - `Checkout? Checkout` - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsMemoryStoreResource:` A memory store attached to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string Description` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? MountPath` 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. - `string? Name` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `required BetaManagedAgentsSessionStats Stats` Timing statistics for a session. - `Double ActiveSeconds` Cumulative time in seconds the session spent in running status. Excludes idle time. - `Double DurationSeconds` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. - `required Status Status` SessionStatus enum - `"rescheduling"Rescheduling` - `"running"Running` - `"idle"Idle` - `"terminated"Terminated` - `required string? Title` - `required Type Type` - `"session"Session` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required BetaManagedAgentsSessionUsage Usage` Cumulative token usage for a session across all turns. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. - `required IReadOnlyList VaultIds` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `string? DeploymentID` Deployment ID when the session was created from a deployment reference. Null otherwise. ### Example ```csharp SessionCreateParams parameters = new() { Agent = "agent_011CZkYpogX7uDKUyvBTophP", EnvironmentID = "env_011CZkZ9X2dpNyB7HsEFoRfW", }; var betaManagedAgentsSession = await client.Beta.Sessions.Create(parameters); Console.WriteLine(betaManagedAgentsSession); ``` #### Response ```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-sonnet-4-6", "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-sonnet-4-6", "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" } } ], "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_011CZkZFNu9hAbo3jZPRgTlx", "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" } } ], "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", "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_011CZkZRSw2kEfs6ncTVljxP", "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_011CZkZCKr6eXyl0gWMOdQiu", "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": { "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "output_tokens": 0 }, "vault_ids": [ "vlt_011CZkZDLs7fYzm1hXNPeRjv" ], "deployment_id": "deployment_id" } ``` ## List Sessions `SessionListPageResponse Beta.Sessions.List(SessionListParams?parameters, CancellationTokencancellationToken = default)` **get** `/v1/sessions` List Sessions ### Parameters - `SessionListParams parameters` - `string agentID` Query param: Filter sessions created with this agent ID. - `Int agentVersion` Query param: Filter by agent version. Only applies when agent_id is also set. - `DateTimeOffset createdAtGt` Query param: Return sessions created after this time (exclusive). - `DateTimeOffset createdAtGte` Query param: Return sessions created at or after this time (inclusive). - `DateTimeOffset createdAtLt` Query param: Return sessions created before this time (exclusive). - `DateTimeOffset createdAtLte` Query param: Return sessions created at or before this time (inclusive). - `string deploymentID` Query param: Filter sessions created by this deployment ID. - `Boolean includeArchived` Query param: When true, includes archived sessions. Default: false (exclude archived). - `Int limit` Query param: Maximum number of results to return. - `string memoryStoreID` Query param: Filter sessions whose resources contain a memory_store with this memory store ID. - `Order order` Query param: Sort direction for results, ordered by created_at. Defaults to desc (newest first). - `"asc"Asc` - `"desc"Desc` - `string page` Query param: Opaque pagination cursor from a previous response. - `IReadOnlyList statuses` Query param: Filter by session status. Repeat the parameter to match any of multiple statuses. - `"rescheduling"Rescheduling` - `"running"Running` - `"idle"Idle` - `"terminated"Terminated` - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class SessionListPageResponse:` Paginated list of sessions. - `IReadOnlyList Data` List of sessions. - `required string ID` - `required BetaManagedAgentsSessionAgent Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `required DateTimeOffset? ArchivedAt` A timestamp in RFC 3339 format - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string EnvironmentID` - `required IReadOnlyDictionary Metadata` - `required IReadOnlyList OutcomeEvaluations` Per-outcome evaluation state. One entry per define_outcome event sent to the session. - `required DateTimeOffset? CompletedAt` A timestamp in RFC 3339 format - `required string Description` What the agent should produce. - `required string? Explanation` 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. - `required Int Iteration` 0-indexed revision cycle the outcome is currently on. - `required string OutcomeID` Server-generated outc_ ID for this outcome. - `required string Result` 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. - `required Type Type` - `"outcome_evaluation"OutcomeEvaluation` - `required IReadOnlyList Resources` - `class BetaManagedAgentsGitHubRepositoryResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string MountPath` - `required Type Type` - `"github_repository"GitHubRepository` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required string Url` - `Checkout? Checkout` - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsMemoryStoreResource:` A memory store attached to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string Description` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? MountPath` 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. - `string? Name` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `required BetaManagedAgentsSessionStats Stats` Timing statistics for a session. - `Double ActiveSeconds` Cumulative time in seconds the session spent in running status. Excludes idle time. - `Double DurationSeconds` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. - `required Status Status` SessionStatus enum - `"rescheduling"Rescheduling` - `"running"Running` - `"idle"Idle` - `"terminated"Terminated` - `required string? Title` - `required Type Type` - `"session"Session` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required BetaManagedAgentsSessionUsage Usage` Cumulative token usage for a session across all turns. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. - `required IReadOnlyList VaultIds` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `string? DeploymentID` Deployment ID when the session was created from a deployment reference. Null otherwise. - `string? NextPage` Opaque cursor for the next page. Null when no more results. ### Example ```csharp SessionListParams parameters = new(); var page = await client.Beta.Sessions.List(parameters); await foreach (var item in page.Paginate()) { Console.WriteLine(item); } ``` #### Response ```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-sonnet-4-6", "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-sonnet-4-6", "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" } } ], "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_011CZkZFNu9hAbo3jZPRgTlx", "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" } } ], "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", "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_011CZkZRSw2kEfs6ncTVljxP", "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_011CZkZCKr6eXyl0gWMOdQiu", "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": { "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "output_tokens": 0 }, "vault_ids": [ "vlt_011CZkZDLs7fYzm1hXNPeRjv" ], "deployment_id": "deployment_id" } ], "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo=" } ``` ## Get Session `BetaManagedAgentsSession Beta.Sessions.Retrieve(SessionRetrieveParamsparameters, CancellationTokencancellationToken = default)` **get** `/v1/sessions/{session_id}` Get Session ### Parameters - `SessionRetrieveParams parameters` - `required string sessionID` Path parameter session_id - `IReadOnlyList betas` Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsSession:` A Managed Agents `session`. - `required string ID` - `required BetaManagedAgentsSessionAgent Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `required DateTimeOffset? ArchivedAt` A timestamp in RFC 3339 format - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string EnvironmentID` - `required IReadOnlyDictionary Metadata` - `required IReadOnlyList OutcomeEvaluations` Per-outcome evaluation state. One entry per define_outcome event sent to the session. - `required DateTimeOffset? CompletedAt` A timestamp in RFC 3339 format - `required string Description` What the agent should produce. - `required string? Explanation` 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. - `required Int Iteration` 0-indexed revision cycle the outcome is currently on. - `required string OutcomeID` Server-generated outc_ ID for this outcome. - `required string Result` 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. - `required Type Type` - `"outcome_evaluation"OutcomeEvaluation` - `required IReadOnlyList Resources` - `class BetaManagedAgentsGitHubRepositoryResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string MountPath` - `required Type Type` - `"github_repository"GitHubRepository` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required string Url` - `Checkout? Checkout` - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsMemoryStoreResource:` A memory store attached to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string Description` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? MountPath` 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. - `string? Name` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `required BetaManagedAgentsSessionStats Stats` Timing statistics for a session. - `Double ActiveSeconds` Cumulative time in seconds the session spent in running status. Excludes idle time. - `Double DurationSeconds` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. - `required Status Status` SessionStatus enum - `"rescheduling"Rescheduling` - `"running"Running` - `"idle"Idle` - `"terminated"Terminated` - `required string? Title` - `required Type Type` - `"session"Session` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required BetaManagedAgentsSessionUsage Usage` Cumulative token usage for a session across all turns. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. - `required IReadOnlyList VaultIds` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `string? DeploymentID` Deployment ID when the session was created from a deployment reference. Null otherwise. ### Example ```csharp SessionRetrieveParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7" }; var betaManagedAgentsSession = await client.Beta.Sessions.Retrieve(parameters); Console.WriteLine(betaManagedAgentsSession); ``` #### Response ```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-sonnet-4-6", "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-sonnet-4-6", "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" } } ], "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_011CZkZFNu9hAbo3jZPRgTlx", "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" } } ], "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", "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_011CZkZRSw2kEfs6ncTVljxP", "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_011CZkZCKr6eXyl0gWMOdQiu", "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": { "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "output_tokens": 0 }, "vault_ids": [ "vlt_011CZkZDLs7fYzm1hXNPeRjv" ], "deployment_id": "deployment_id" } ``` ## Update Session `BetaManagedAgentsSession Beta.Sessions.Update(SessionUpdateParamsparameters, CancellationTokencancellationToken = default)` **post** `/v1/sessions/{session_id}` Update Session ### Parameters - `SessionUpdateParams parameters` - `required string sessionID` Path param: Path parameter session_id - `BetaManagedAgentsSessionAgentUpdate agent` Body param: 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. - `IReadOnlyDictionary? metadata` Body param: Metadata patch. Set a key to a string to upsert it, or to null to delete it. Omit the field to preserve. - `string? title` Body param: Human-readable session title. - `IReadOnlyList vaultIds` Body param: Vault IDs (`vlt_*`) to attach to the session. Not yet supported; requests setting this field are rejected. Reserved for future use. - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsSession:` A Managed Agents `session`. - `required string ID` - `required BetaManagedAgentsSessionAgent Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `required DateTimeOffset? ArchivedAt` A timestamp in RFC 3339 format - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string EnvironmentID` - `required IReadOnlyDictionary Metadata` - `required IReadOnlyList OutcomeEvaluations` Per-outcome evaluation state. One entry per define_outcome event sent to the session. - `required DateTimeOffset? CompletedAt` A timestamp in RFC 3339 format - `required string Description` What the agent should produce. - `required string? Explanation` 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. - `required Int Iteration` 0-indexed revision cycle the outcome is currently on. - `required string OutcomeID` Server-generated outc_ ID for this outcome. - `required string Result` 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. - `required Type Type` - `"outcome_evaluation"OutcomeEvaluation` - `required IReadOnlyList Resources` - `class BetaManagedAgentsGitHubRepositoryResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string MountPath` - `required Type Type` - `"github_repository"GitHubRepository` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required string Url` - `Checkout? Checkout` - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsMemoryStoreResource:` A memory store attached to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string Description` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? MountPath` 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. - `string? Name` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `required BetaManagedAgentsSessionStats Stats` Timing statistics for a session. - `Double ActiveSeconds` Cumulative time in seconds the session spent in running status. Excludes idle time. - `Double DurationSeconds` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. - `required Status Status` SessionStatus enum - `"rescheduling"Rescheduling` - `"running"Running` - `"idle"Idle` - `"terminated"Terminated` - `required string? Title` - `required Type Type` - `"session"Session` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required BetaManagedAgentsSessionUsage Usage` Cumulative token usage for a session across all turns. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. - `required IReadOnlyList VaultIds` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `string? DeploymentID` Deployment ID when the session was created from a deployment reference. Null otherwise. ### Example ```csharp SessionUpdateParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7" }; var betaManagedAgentsSession = await client.Beta.Sessions.Update(parameters); Console.WriteLine(betaManagedAgentsSession); ``` #### Response ```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-sonnet-4-6", "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-sonnet-4-6", "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" } } ], "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_011CZkZFNu9hAbo3jZPRgTlx", "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" } } ], "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", "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_011CZkZRSw2kEfs6ncTVljxP", "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_011CZkZCKr6eXyl0gWMOdQiu", "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": { "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "output_tokens": 0 }, "vault_ids": [ "vlt_011CZkZDLs7fYzm1hXNPeRjv" ], "deployment_id": "deployment_id" } ``` ## Delete Session `BetaManagedAgentsDeletedSession Beta.Sessions.Delete(SessionDeleteParamsparameters, CancellationTokencancellationToken = default)` **delete** `/v1/sessions/{session_id}` Delete Session ### Parameters - `SessionDeleteParams parameters` - `required string sessionID` Path parameter session_id - `IReadOnlyList betas` Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsDeletedSession:` Confirmation that a `session` has been permanently deleted. - `required string ID` - `required Type Type` - `"session_deleted"SessionDeleted` ### Example ```csharp SessionDeleteParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7" }; var betaManagedAgentsDeletedSession = await client.Beta.Sessions.Delete(parameters); Console.WriteLine(betaManagedAgentsDeletedSession); ``` #### Response ```json { "id": "sesn_011CZkZAtmR3yMPDzynEDxu7", "type": "session_deleted" } ``` ## Archive Session `BetaManagedAgentsSession Beta.Sessions.Archive(SessionArchiveParamsparameters, CancellationTokencancellationToken = default)` **post** `/v1/sessions/{session_id}/archive` Archive Session ### Parameters - `SessionArchiveParams parameters` - `required string sessionID` Path parameter session_id - `IReadOnlyList betas` Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsSession:` A Managed Agents `session`. - `required string ID` - `required BetaManagedAgentsSessionAgent Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `required DateTimeOffset? ArchivedAt` A timestamp in RFC 3339 format - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string EnvironmentID` - `required IReadOnlyDictionary Metadata` - `required IReadOnlyList OutcomeEvaluations` Per-outcome evaluation state. One entry per define_outcome event sent to the session. - `required DateTimeOffset? CompletedAt` A timestamp in RFC 3339 format - `required string Description` What the agent should produce. - `required string? Explanation` 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. - `required Int Iteration` 0-indexed revision cycle the outcome is currently on. - `required string OutcomeID` Server-generated outc_ ID for this outcome. - `required string Result` 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. - `required Type Type` - `"outcome_evaluation"OutcomeEvaluation` - `required IReadOnlyList Resources` - `class BetaManagedAgentsGitHubRepositoryResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string MountPath` - `required Type Type` - `"github_repository"GitHubRepository` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required string Url` - `Checkout? Checkout` - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsMemoryStoreResource:` A memory store attached to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string Description` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? MountPath` 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. - `string? Name` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `required BetaManagedAgentsSessionStats Stats` Timing statistics for a session. - `Double ActiveSeconds` Cumulative time in seconds the session spent in running status. Excludes idle time. - `Double DurationSeconds` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. - `required Status Status` SessionStatus enum - `"rescheduling"Rescheduling` - `"running"Running` - `"idle"Idle` - `"terminated"Terminated` - `required string? Title` - `required Type Type` - `"session"Session` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required BetaManagedAgentsSessionUsage Usage` Cumulative token usage for a session across all turns. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. - `required IReadOnlyList VaultIds` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `string? DeploymentID` Deployment ID when the session was created from a deployment reference. Null otherwise. ### Example ```csharp SessionArchiveParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7" }; var betaManagedAgentsSession = await client.Beta.Sessions.Archive(parameters); Console.WriteLine(betaManagedAgentsSession); ``` #### Response ```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-sonnet-4-6", "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-sonnet-4-6", "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" } } ], "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_011CZkZFNu9hAbo3jZPRgTlx", "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" } } ], "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", "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_011CZkZRSw2kEfs6ncTVljxP", "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_011CZkZCKr6eXyl0gWMOdQiu", "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": { "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "output_tokens": 0 }, "vault_ids": [ "vlt_011CZkZDLs7fYzm1hXNPeRjv" ], "deployment_id": "deployment_id" } ``` ## Domain Types ### 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 - `required string ID` The `agent` ID. - `required Type Type` - `"agent"Agent` - `Int Version` The specific `agent` version to use. Omit to use the latest version. Must be at least 1 if specified. ### Beta Managed Agents Branch Checkout - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` ### Beta Managed Agents Cache Creation Usage - `class BetaManagedAgentsCacheCreationUsage:` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. ### Beta Managed Agents Commit Checkout - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` ### Beta Managed Agents Deleted Session - `class BetaManagedAgentsDeletedSession:` Confirmation that a `session` has been permanently deleted. - `required string ID` - `required Type Type` - `"session_deleted"SessionDeleted` ### Beta Managed Agents File Resource Params - `class BetaManagedAgentsFileResourceParams:` Mount a file uploaded via the Files API into the session. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `string? MountPath` Mount path in the container. Defaults to `/mnt/session/uploads/`. ### Beta Managed Agents GitHub Repository Resource Params - `class BetaManagedAgentsGitHubRepositoryResourceParams:` Mount a GitHub repository into the session's container. - `required string AuthorizationToken` GitHub authorization token used to clone the repository. - `required Type Type` - `"github_repository"GitHubRepository` - `required string Url` Github URL of the repository - `Checkout? Checkout` Branch or commit to check out. Defaults to the repository's default branch. - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `string? MountPath` Mount path in the container. Defaults to `/workspace/`. ### Beta Managed Agents Memory Store Resource Param - `class BetaManagedAgentsMemoryStoreResourceParam:` Parameters for attaching a memory store to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. ### Beta Managed Agents Multiagent - `class BetaManagedAgentsMultiagent:` Resolved coordinator topology with a concrete agent roster. - `required IReadOnlyList Agents` Agents the coordinator may spawn as session threads, each resolved to a specific version. - `required string ID` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` ### Beta Managed Agents Multiagent Params - `class BetaManagedAgentsMultiagentParams:` A coordinator topology: the session's primary thread orchestrates work by spawning session threads, each running an agent drawn from the `agents` roster. - `required IReadOnlyList Agents` 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). - `string` - `class BetaManagedAgentsAgentParams:` Specification for an Agent. Provide a specific `version` or use the short-form `agent="agent_id"` for the most recent version - `required string ID` The `agent` ID. - `required Type Type` - `"agent"Agent` - `Int Version` The specific `agent` version to use. Omit to use the latest version. Must be at least 1 if specified. - `class BetaManagedAgentsMultiagentSelfParams:` Sentinel roster entry meaning "the agent that owns this configuration". Resolved server-side to a concrete agent reference. - `required Type Type` - `"self"Self` - `required Type Type` - `"coordinator"Coordinator` ### Beta Managed Agents Multiagent Roster Entry Params - `class BetaManagedAgentsMultiagentRosterEntryParams: A class that can be one of several variants.union` An entry in a multiagent roster: an agent ID string, a versioned agent reference, or `self`. - `string` - `class BetaManagedAgentsAgentParams:` Specification for an Agent. Provide a specific `version` or use the short-form `agent="agent_id"` for the most recent version - `required string ID` The `agent` ID. - `required Type Type` - `"agent"Agent` - `Int Version` The specific `agent` version to use. Omit to use the latest version. Must be at least 1 if specified. - `class BetaManagedAgentsMultiagentSelfParams:` Sentinel roster entry meaning "the agent that owns this configuration". Resolved server-side to a concrete agent reference. - `required Type Type` - `"self"Self` ### Beta Managed Agents Outcome Evaluation Resource - `class BetaManagedAgentsOutcomeEvaluationResource:` Evaluation state for a single outcome defined via a define_outcome event. - `required DateTimeOffset? CompletedAt` A timestamp in RFC 3339 format - `required string Description` What the agent should produce. - `required string? Explanation` 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. - `required Int Iteration` 0-indexed revision cycle the outcome is currently on. - `required string OutcomeID` Server-generated outc_ ID for this outcome. - `required string Result` 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. - `required Type Type` - `"outcome_evaluation"OutcomeEvaluation` ### Beta Managed Agents Session - `class BetaManagedAgentsSession:` A Managed Agents `session`. - `required string ID` - `required BetaManagedAgentsSessionAgent Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `required DateTimeOffset? ArchivedAt` A timestamp in RFC 3339 format - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string EnvironmentID` - `required IReadOnlyDictionary Metadata` - `required IReadOnlyList OutcomeEvaluations` Per-outcome evaluation state. One entry per define_outcome event sent to the session. - `required DateTimeOffset? CompletedAt` A timestamp in RFC 3339 format - `required string Description` What the agent should produce. - `required string? Explanation` 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. - `required Int Iteration` 0-indexed revision cycle the outcome is currently on. - `required string OutcomeID` Server-generated outc_ ID for this outcome. - `required string Result` 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. - `required Type Type` - `"outcome_evaluation"OutcomeEvaluation` - `required IReadOnlyList Resources` - `class BetaManagedAgentsGitHubRepositoryResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string MountPath` - `required Type Type` - `"github_repository"GitHubRepository` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required string Url` - `Checkout? Checkout` - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsMemoryStoreResource:` A memory store attached to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string Description` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? MountPath` 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. - `string? Name` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `required BetaManagedAgentsSessionStats Stats` Timing statistics for a session. - `Double ActiveSeconds` Cumulative time in seconds the session spent in running status. Excludes idle time. - `Double DurationSeconds` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. - `required Status Status` SessionStatus enum - `"rescheduling"Rescheduling` - `"running"Running` - `"idle"Idle` - `"terminated"Terminated` - `required string? Title` - `required Type Type` - `"session"Session` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required BetaManagedAgentsSessionUsage Usage` Cumulative token usage for a session across all turns. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. - `required IReadOnlyList VaultIds` Vault IDs attached to the session at creation. Empty when no vaults were supplied. - `string? DeploymentID` 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. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` ### 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. - `IReadOnlyList McpServers` Replacement MCP server list. Full replacement: the provided array becomes the new value. Send an empty array to clear; omit to preserve. - `required string Name` Unique name for this server, referenced by mcp_toolset configurations. 1-255 characters. - `required Type Type` - `"url"Url` - `required string Url` Endpoint URL for the MCP server. - `IReadOnlyList Tools` 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `IReadOnlyList Configs` Per-tool configuration overrides. - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `Boolean? Enabled` Whether this tool is enabled and available to Claude. Overrides the default_config setting. - `PermissionPolicy? PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `BetaManagedAgentsAgentToolsetDefaultConfigParams? DefaultConfig` Default configuration for all tools in a toolset. - `Boolean? Enabled` Whether tools are enabled and available to Claude by default. Defaults to true if not specified. - `PermissionPolicy? 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 BetaManagedAgentsMcpToolsetParams:` Configuration for tools from an MCP server defined in `mcp_servers`. - `required string McpServerName` Name of the MCP server. Must match a server name from the mcp_servers array. 1-255 characters. - `required Type Type` - `"mcp_toolset"McpToolset` - `IReadOnlyList Configs` Per-tool configuration overrides. - `required string Name` Name of the MCP tool to configure. 1-128 characters. - `Boolean? Enabled` Whether this tool is enabled. Overrides the `default_config` setting. - `PermissionPolicy? 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. - `BetaManagedAgentsMcpToolsetDefaultConfigParams? DefaultConfig` Default configuration for all tools from an MCP server. - `Boolean? Enabled` Whether tools are enabled by default. Defaults to true if not specified. - `PermissionPolicy? 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 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. - `required string Description` Description of what the tool does, shown to the agent to help it decide when to use the tool. 1-1024 characters. - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` Unique name for the tool. 1-128 characters; letters, digits, underscores, and hyphens. - `required Type Type` - `"custom"Custom` ### Beta Managed Agents Session Multiagent Coordinator - `class BetaManagedAgentsSessionMultiagentCoordinator:` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` ### Beta Managed Agents Session Stats - `class BetaManagedAgentsSessionStats:` Timing statistics for a session. - `Double ActiveSeconds` Cumulative time in seconds the session spent in running status. Excludes idle time. - `Double DurationSeconds` Elapsed time since session creation in seconds. For terminated sessions, frozen at the final update. ### 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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.updated"SessionUpdated` - `BetaManagedAgentsSessionAgent? Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `IReadOnlyDictionary Metadata` 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. - `string? Title` 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. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. ### Beta Managed Agents System Content Block - `class BetaManagedAgentsSystemContentBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` ### 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` System content blocks. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format ### 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. - `required string ID` Unique identifier for this event. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList Content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. # Events ## List Events `EventListPageResponse Beta.Sessions.Events.List(EventListParamsparameters, CancellationTokencancellationToken = default)` **get** `/v1/sessions/{session_id}/events` List Events ### Parameters - `EventListParams parameters` - `required string sessionID` Path param: Path parameter session_id - `DateTimeOffset createdAtGt` Query param: Return events created after this time (exclusive). - `DateTimeOffset createdAtGte` Query param: Return events created at or after this time (inclusive). - `DateTimeOffset createdAtLt` Query param: Return events created before this time (exclusive). - `DateTimeOffset createdAtLte` Query param: Return events created at or before this time (inclusive). - `Int limit` Query param: Query parameter for limit - `Order order` Query param: Sort direction for results, ordered by created_at. Defaults to asc (chronological). - `"asc"Asc` - `"desc"Desc` - `string page` Query param: Opaque pagination cursor from a previous response's next_page. - `IReadOnlyList types` Query param: 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. - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class EventListPageResponse:` Paginated list of events for a `session`. - `IReadOnlyList Data` Events for the session, ordered by `created_at`. - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `required string ID` Unique identifier for this event. - `required Type Type` - `"user.interrupt"UserInterrupt` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` 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. - `required string ID` Unique identifier for this event. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `required string ID` Unique identifier for this event. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList 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. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the custom tool being called. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.custom_tool_use"AgentCustomToolUse` - `string? SessionThreadID` 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. Echo this on a `user.custom_tool_result` event to route the result back. - `class BetaManagedAgentsAgentMessageEvent:` An agent response event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of text blocks comprising the agent response. - `required string Text` The text content. - `required Type Type` - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.message"AgentMessage` - `class BetaManagedAgentsAgentThinkingEvent:` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thinking"AgentThinking` - `class BetaManagedAgentsAgentMcpToolUseEvent:` Event emitted when the agent invokes a tool provided by an MCP server. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string McpServerName` Name of the MCP server providing the tool. - `required string Name` Name of the MCP tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_use"AgentMcpToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentMcpToolResultEvent:` Event representing the result of an MCP tool execution. - `required string ID` Unique identifier for this event. - `required string McpToolUseID` The id of the `agent.mcp_tool_use` event this result corresponds to. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_result"AgentMcpToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent:` Event emitted when the agent invokes a built-in agent tool. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the agent tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.tool_use"AgentToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentToolResultEvent:` Event representing the result of an agent tool execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToolUseID` The id of the `agent.tool_use` event this result corresponds to. - `required Type Type` - `"agent.tool_result"AgentToolResult` - `IReadOnlyList 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. - `Boolean? IsError` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required string FromSessionThreadID` Public `sthr_` ID of the thread that sent the message. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_message_received"AgentThreadMessageReceived` - `string? FromAgentName` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToSessionThreadID` Public `sthr_` ID of the thread the message was sent to. - `required Type Type` - `"agent.thread_message_sent"AgentThreadMessageSent` - `string? ToAgentName` 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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_context_compacted"AgentThreadContextCompacted` - `class BetaManagedAgentsSessionErrorEvent:` An error event indicating a problem occurred during session execution. - `required string ID` Unique identifier for this event. - `required Error Error` 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. - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"unknown_error"UnknownError` - `class BetaManagedAgentsModelOverloadedError:` The model is currently overloaded. Emitted after automatic retries are exhausted. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_overloaded_error"ModelOverloadedError` - `class BetaManagedAgentsModelRateLimitedError:` The model request was rate-limited. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_rate_limited_error"ModelRateLimitedError` - `class BetaManagedAgentsModelRequestFailedError:` A model request failed for a reason other than overload or rate-limiting. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_request_failed_error"ModelRequestFailedError` - `class BetaManagedAgentsMcpConnectionFailedError:` Failed to connect to an MCP server. - `required string McpServerName` Name of the MCP server that failed to connect. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_connection_failed_error"McpConnectionFailedError` - `class BetaManagedAgentsMcpAuthenticationFailedError:` Authentication to an MCP server failed. - `required string McpServerName` Name of the MCP server that failed authentication. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_authentication_failed_error"McpAuthenticationFailedError` - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"billing_error"BillingError` - `class BetaManagedAgentsCredentialHostUnreachableError:` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `required string CredentialID` ID of the affected credential. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"credential_host_unreachable_error"CredentialHostUnreachableError` - `required string VaultID` ID of the vault containing the affected credential. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.error"SessionError` - `class BetaManagedAgentsSessionStatusRescheduledEvent:` Indicates the session is recovering from an error state and is rescheduled for execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_rescheduled"SessionStatusRescheduled` - `class BetaManagedAgentsSessionStatusRunningEvent:` Indicates the session is actively running and the agent is working. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_running"SessionStatusRunning` - `class BetaManagedAgentsSessionStatusIdleEvent:` Indicates the agent has paused and is awaiting user input. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `required Type Type` - `"end_turn"EndTurn` - `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. - `required IReadOnlyList EventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `required Type Type` - `"requires_action"RequiresAction` - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"retries_exhausted"RetriesExhausted` - `required Type Type` - `"session.status_idle"SessionStatusIdle` - `class BetaManagedAgentsSessionStatusTerminatedEvent:` Indicates the session has terminated, either due to an error or completion. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_terminated"SessionStatusTerminated` - `class BetaManagedAgentsSessionThreadCreatedEvent:` Emitted when a subagent is spawned as a new thread. Written to the parent thread's output stream so clients observing the session see child creation. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the callable agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public `sthr_` ID of the newly created thread. - `required Type Type` - `"session.thread_created"SessionThreadCreated` - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent:` Emitted when an outcome evaluation cycle begins. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_start"SpanOutcomeEvaluationStart` - `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. - `required string ID` Unique identifier for this event. - `required string Explanation` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeEvaluationStartID` The id of the corresponding `span.outcome_evaluation_start` event. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string Result` 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. - `required Type Type` - `"span.outcome_evaluation_end"SpanOutcomeEvaluationEnd` - `required BetaManagedAgentsSpanModelUsage Usage` Token usage for a single model request. - `required Int CacheCreationInputTokens` Tokens used to create prompt cache in this request. - `required Int CacheReadInputTokens` Tokens read from prompt cache in this request. - `required Int InputTokens` Input tokens consumed by this request. - `required Int OutputTokens` Output tokens generated by this request. - `Speed? Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `class BetaManagedAgentsSpanModelRequestStartEvent:` Emitted when a model request is initiated by the agent. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_start"SpanModelRequestStart` - `class BetaManagedAgentsSpanModelRequestEndEvent:` Emitted when a model request completes. - `required string ID` Unique identifier for this event. - `required Boolean? IsError` Whether the model request resulted in an error. - `required string ModelRequestStartID` The id of the corresponding `span.model_request_start` event. - `required BetaManagedAgentsSpanModelUsage ModelUsage` Token usage for a single model request. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_end"SpanModelRequestEnd` - `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. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_ongoing"SpanOutcomeEvaluationOngoing` - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `required string ID` Unique identifier for this event. - `required string Description` What the agent should produce. Copied from the input event. - `required Int? MaxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `required string OutcomeID` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `class BetaManagedAgentsSessionDeletedEvent:` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.deleted"SessionDeleted` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that started running. - `required Type Type` - `"session.thread_status_running"SessionThreadStatusRunning` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that went idle. - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `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 the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"session.thread_status_idle"SessionThreadStatusIdle` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that terminated. - `required Type Type` - `"session.thread_status_terminated"SessionThreadStatusTerminated` - `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. - `required string ID` Unique identifier for this event. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that is retrying. - `required Type Type` - `"session.thread_status_rescheduled"SessionThreadStatusRescheduled` - `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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.updated"SessionUpdated` - `BetaManagedAgentsSessionAgent? Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `IReadOnlyDictionary Metadata` 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. - `string? Title` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` System content blocks. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? NextPage` Opaque cursor for the next page. Null when no more results. ### Example ```csharp EventListParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7" }; var page = await client.Beta.Sessions.Events.List(parameters); await foreach (var item in page.Paginate()) { Console.WriteLine(item); } ``` #### Response ```json { "data": [ { "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" }, { "id": "sevt_011CZkZHPq1jCdq5lbRTjiVnz", "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 `BetaManagedAgentsSendSessionEvents Beta.Sessions.Events.Send(EventSendParamsparameters, CancellationTokencancellationToken = default)` **post** `/v1/sessions/{session_id}/events` Send Events ### Parameters - `EventSendParams parameters` - `required string sessionID` Path param: Path parameter session_id - `required IReadOnlyList events` Body param: Events to send to the `session`. - `class BetaManagedAgentsUserMessageEventParams:` Parameters for sending a user message to the session. - `required IReadOnlyList Content` Array of content blocks for the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `class BetaManagedAgentsUserInterruptEventParams:` Parameters for sending an interrupt to pause the agent. - `required Type Type` - `"user.interrupt"UserInterrupt` - `string? SessionThreadID` 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. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `class BetaManagedAgentsUserCustomToolResultEventParams:` Parameters for providing the result of a custom tool execution. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList 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. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` 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. - `required string Description` What the agent should produce. This is the task specification. - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubricParams:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubricParams:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. Maximum 262144 characters. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `Int? MaxIterations` Eval→revision cycles before giving up. Default 3, max 20. - `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. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList 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. - `Boolean? IsError` 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. - `required IReadOnlyList Content` System content blocks to append. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsSendSessionEvents:` Events that were successfully sent to the session. - `IReadOnlyList Data` Sent events - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `required string ID` Unique identifier for this event. - `required Type Type` - `"user.interrupt"UserInterrupt` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` 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. - `required string ID` Unique identifier for this event. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `required string ID` Unique identifier for this event. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList 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. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `required string ID` Unique identifier for this event. - `required string Description` What the agent should produce. Copied from the input event. - `required Int? MaxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `required string OutcomeID` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `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. - `required string ID` Unique identifier for this event. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `class BetaManagedAgentsSystemMessageEvent:` A mid-conversation system message event. Carries system-role content that is appended to the session as a `role: "system"` turn. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` System content blocks. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format ### Example ```csharp EventSendParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7", Events = [ new BetaManagedAgentsUserMessageEventParams() { Content = [ new BetaManagedAgentsTextBlock() { Text = "Where is my order #1234?", Type = Type.Text, }, ], Type = Type.UserMessage, }, ], }; var betaManagedAgentsSendSessionEvents = await client.Beta.Sessions.Events.Send(parameters); Console.WriteLine(betaManagedAgentsSendSessionEvents); ``` #### Response ```json { "data": [ { "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ] } ``` ## Stream Events `BetaManagedAgentsStreamSessionEvents Beta.Sessions.Events.StreamStreaming(EventStreamParamsparameters, CancellationTokencancellationToken = default)` **get** `/v1/sessions/{session_id}/events/stream` Stream Events ### Parameters - `EventStreamParams parameters` - `required string sessionID` Path parameter session_id - `IReadOnlyList betas` Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsStreamSessionEvents: A class that can be one of several variants.union` Server-sent event in the session stream. - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `required string ID` Unique identifier for this event. - `required Type Type` - `"user.interrupt"UserInterrupt` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` 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. - `required string ID` Unique identifier for this event. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `required string ID` Unique identifier for this event. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList 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. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the custom tool being called. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.custom_tool_use"AgentCustomToolUse` - `string? SessionThreadID` 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. Echo this on a `user.custom_tool_result` event to route the result back. - `class BetaManagedAgentsAgentMessageEvent:` An agent response event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of text blocks comprising the agent response. - `required string Text` The text content. - `required Type Type` - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.message"AgentMessage` - `class BetaManagedAgentsAgentThinkingEvent:` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thinking"AgentThinking` - `class BetaManagedAgentsAgentMcpToolUseEvent:` Event emitted when the agent invokes a tool provided by an MCP server. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string McpServerName` Name of the MCP server providing the tool. - `required string Name` Name of the MCP tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_use"AgentMcpToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentMcpToolResultEvent:` Event representing the result of an MCP tool execution. - `required string ID` Unique identifier for this event. - `required string McpToolUseID` The id of the `agent.mcp_tool_use` event this result corresponds to. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_result"AgentMcpToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent:` Event emitted when the agent invokes a built-in agent tool. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the agent tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.tool_use"AgentToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentToolResultEvent:` Event representing the result of an agent tool execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToolUseID` The id of the `agent.tool_use` event this result corresponds to. - `required Type Type` - `"agent.tool_result"AgentToolResult` - `IReadOnlyList 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. - `Boolean? IsError` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required string FromSessionThreadID` Public `sthr_` ID of the thread that sent the message. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_message_received"AgentThreadMessageReceived` - `string? FromAgentName` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToSessionThreadID` Public `sthr_` ID of the thread the message was sent to. - `required Type Type` - `"agent.thread_message_sent"AgentThreadMessageSent` - `string? ToAgentName` 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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_context_compacted"AgentThreadContextCompacted` - `class BetaManagedAgentsSessionErrorEvent:` An error event indicating a problem occurred during session execution. - `required string ID` Unique identifier for this event. - `required Error Error` 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. - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"unknown_error"UnknownError` - `class BetaManagedAgentsModelOverloadedError:` The model is currently overloaded. Emitted after automatic retries are exhausted. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_overloaded_error"ModelOverloadedError` - `class BetaManagedAgentsModelRateLimitedError:` The model request was rate-limited. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_rate_limited_error"ModelRateLimitedError` - `class BetaManagedAgentsModelRequestFailedError:` A model request failed for a reason other than overload or rate-limiting. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_request_failed_error"ModelRequestFailedError` - `class BetaManagedAgentsMcpConnectionFailedError:` Failed to connect to an MCP server. - `required string McpServerName` Name of the MCP server that failed to connect. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_connection_failed_error"McpConnectionFailedError` - `class BetaManagedAgentsMcpAuthenticationFailedError:` Authentication to an MCP server failed. - `required string McpServerName` Name of the MCP server that failed authentication. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_authentication_failed_error"McpAuthenticationFailedError` - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"billing_error"BillingError` - `class BetaManagedAgentsCredentialHostUnreachableError:` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `required string CredentialID` ID of the affected credential. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"credential_host_unreachable_error"CredentialHostUnreachableError` - `required string VaultID` ID of the vault containing the affected credential. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.error"SessionError` - `class BetaManagedAgentsSessionStatusRescheduledEvent:` Indicates the session is recovering from an error state and is rescheduled for execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_rescheduled"SessionStatusRescheduled` - `class BetaManagedAgentsSessionStatusRunningEvent:` Indicates the session is actively running and the agent is working. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_running"SessionStatusRunning` - `class BetaManagedAgentsSessionStatusIdleEvent:` Indicates the agent has paused and is awaiting user input. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `required Type Type` - `"end_turn"EndTurn` - `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. - `required IReadOnlyList EventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `required Type Type` - `"requires_action"RequiresAction` - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"retries_exhausted"RetriesExhausted` - `required Type Type` - `"session.status_idle"SessionStatusIdle` - `class BetaManagedAgentsSessionStatusTerminatedEvent:` Indicates the session has terminated, either due to an error or completion. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_terminated"SessionStatusTerminated` - `class BetaManagedAgentsSessionThreadCreatedEvent:` Emitted when a subagent is spawned as a new thread. Written to the parent thread's output stream so clients observing the session see child creation. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the callable agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public `sthr_` ID of the newly created thread. - `required Type Type` - `"session.thread_created"SessionThreadCreated` - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent:` Emitted when an outcome evaluation cycle begins. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_start"SpanOutcomeEvaluationStart` - `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. - `required string ID` Unique identifier for this event. - `required string Explanation` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeEvaluationStartID` The id of the corresponding `span.outcome_evaluation_start` event. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string Result` 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. - `required Type Type` - `"span.outcome_evaluation_end"SpanOutcomeEvaluationEnd` - `required BetaManagedAgentsSpanModelUsage Usage` Token usage for a single model request. - `required Int CacheCreationInputTokens` Tokens used to create prompt cache in this request. - `required Int CacheReadInputTokens` Tokens read from prompt cache in this request. - `required Int InputTokens` Input tokens consumed by this request. - `required Int OutputTokens` Output tokens generated by this request. - `Speed? Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `class BetaManagedAgentsSpanModelRequestStartEvent:` Emitted when a model request is initiated by the agent. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_start"SpanModelRequestStart` - `class BetaManagedAgentsSpanModelRequestEndEvent:` Emitted when a model request completes. - `required string ID` Unique identifier for this event. - `required Boolean? IsError` Whether the model request resulted in an error. - `required string ModelRequestStartID` The id of the corresponding `span.model_request_start` event. - `required BetaManagedAgentsSpanModelUsage ModelUsage` Token usage for a single model request. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_end"SpanModelRequestEnd` - `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. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_ongoing"SpanOutcomeEvaluationOngoing` - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `required string ID` Unique identifier for this event. - `required string Description` What the agent should produce. Copied from the input event. - `required Int? MaxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `required string OutcomeID` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `class BetaManagedAgentsSessionDeletedEvent:` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.deleted"SessionDeleted` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that started running. - `required Type Type` - `"session.thread_status_running"SessionThreadStatusRunning` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that went idle. - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `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 the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"session.thread_status_idle"SessionThreadStatusIdle` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that terminated. - `required Type Type` - `"session.thread_status_terminated"SessionThreadStatusTerminated` - `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. - `required string ID` Unique identifier for this event. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that is retrying. - `required Type Type` - `"session.thread_status_rescheduled"SessionThreadStatusRescheduled` - `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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.updated"SessionUpdated` - `BetaManagedAgentsSessionAgent? Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `IReadOnlyDictionary Metadata` 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. - `string? Title` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` System content blocks. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format ### Example ```csharp EventStreamParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7" }; await foreach (var betaManagedAgentsStreamSessionEvents in client.Beta.Sessions.Events.StreamStreaming(parameters)) { Console.WriteLine(betaManagedAgentsStreamSessionEvents); } ``` #### Response ```json { "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ``` ## Domain Types ### Beta Managed Agents Agent Custom Tool Use Event - `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. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the custom tool being called. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.custom_tool_use"AgentCustomToolUse` - `string? SessionThreadID` 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. Echo this on a `user.custom_tool_result` event to route the result back. ### Beta Managed Agents Agent MCP Tool Result Event - `class BetaManagedAgentsAgentMcpToolResultEvent:` Event representing the result of an MCP tool execution. - `required string ID` Unique identifier for this event. - `required string McpToolUseID` The id of the `agent.mcp_tool_use` event this result corresponds to. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_result"AgentMcpToolResult` - `IReadOnlyList Content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. ### Beta Managed Agents Agent MCP Tool Use Event - `class BetaManagedAgentsAgentMcpToolUseEvent:` Event emitted when the agent invokes a tool provided by an MCP server. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string McpServerName` Name of the MCP server providing the tool. - `required string Name` Name of the MCP tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_use"AgentMcpToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. ### Beta Managed Agents Agent Message Event - `class BetaManagedAgentsAgentMessageEvent:` An agent response event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of text blocks comprising the agent response. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.message"AgentMessage` ### Beta Managed Agents Agent Thinking Event - `class BetaManagedAgentsAgentThinkingEvent:` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thinking"AgentThinking` ### Beta Managed Agents Agent Thread Context Compacted Event - `class BetaManagedAgentsAgentThreadContextCompactedEvent:` Indicates that context compaction (summarization) occurred during the session. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_context_compacted"AgentThreadContextCompacted` ### Beta Managed Agents Agent Thread Message Received Event - `class BetaManagedAgentsAgentThreadMessageReceivedEvent:` Delivery event written to the target thread's input stream when an agent-to-agent message arrives. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Message content blocks. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required string FromSessionThreadID` Public `sthr_` ID of the thread that sent the message. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_message_received"AgentThreadMessageReceived` - `string? FromAgentName` Name of the callable agent this message came from. Absent when received from the primary agent. ### Beta Managed Agents Agent Thread Message Sent Event - `class BetaManagedAgentsAgentThreadMessageSentEvent:` Observability event emitted to the sender's output stream when an agent-to-agent message is sent. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Message content blocks. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToSessionThreadID` Public `sthr_` ID of the thread the message was sent to. - `required Type Type` - `"agent.thread_message_sent"AgentThreadMessageSent` - `string? ToAgentName` Name of the callable agent this message was sent to. Absent when sent to the primary agent. ### Beta Managed Agents Agent Tool Result Event - `class BetaManagedAgentsAgentToolResultEvent:` Event representing the result of an agent tool execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToolUseID` The id of the `agent.tool_use` event this result corresponds to. - `required Type Type` - `"agent.tool_result"AgentToolResult` - `IReadOnlyList Content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. ### Beta Managed Agents Agent Tool Use Event - `class BetaManagedAgentsAgentToolUseEvent:` Event emitted when the agent invokes a built-in agent tool. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the agent tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.tool_use"AgentToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. ### Beta Managed Agents Base64 Document Source - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` ### Beta Managed Agents Base64 Image Source - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` ### Beta Managed Agents Billing Error - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"billing_error"BillingError` ### Beta Managed Agents Credential Host Unreachable Error - `class BetaManagedAgentsCredentialHostUnreachableError:` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `required string CredentialID` ID of the affected credential. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"credential_host_unreachable_error"CredentialHostUnreachableError` - `required string VaultID` ID of the vault containing the affected credential. ### Beta Managed Agents Document Block - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. ### Beta Managed Agents Event Params - `class BetaManagedAgentsEventParams: A class that can be one of several variants.union` Union type for event parameters that can be sent to a session. - `class BetaManagedAgentsUserMessageEventParams:` Parameters for sending a user message to the session. - `required IReadOnlyList Content` Array of content blocks for the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `class BetaManagedAgentsUserInterruptEventParams:` Parameters for sending an interrupt to pause the agent. - `required Type Type` - `"user.interrupt"UserInterrupt` - `string? SessionThreadID` 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. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `class BetaManagedAgentsUserCustomToolResultEventParams:` Parameters for providing the result of a custom tool execution. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList 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. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` 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. - `required string Description` What the agent should produce. This is the task specification. - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubricParams:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubricParams:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. Maximum 262144 characters. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `Int? MaxIterations` Eval→revision cycles before giving up. Default 3, max 20. - `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. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList 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. - `Boolean? IsError` 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. - `required IReadOnlyList Content` System content blocks to append. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` ### Beta Managed Agents File Document Source - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` ### Beta Managed Agents File Image Source - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` ### Beta Managed Agents File Rubric - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` ### Beta Managed Agents File Rubric Params - `class BetaManagedAgentsFileRubricParams:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` ### Beta Managed Agents Image Block - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` ### Beta Managed Agents MCP Authentication Failed Error - `class BetaManagedAgentsMcpAuthenticationFailedError:` Authentication to an MCP server failed. - `required string McpServerName` Name of the MCP server that failed authentication. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"mcp_authentication_failed_error"McpAuthenticationFailedError` ### Beta Managed Agents MCP Connection Failed Error - `class BetaManagedAgentsMcpConnectionFailedError:` Failed to connect to an MCP server. - `required string McpServerName` Name of the MCP server that failed to connect. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"mcp_connection_failed_error"McpConnectionFailedError` ### Beta Managed Agents Model Overloaded Error - `class BetaManagedAgentsModelOverloadedError:` The model is currently overloaded. Emitted after automatic retries are exhausted. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"model_overloaded_error"ModelOverloadedError` ### Beta Managed Agents Model Rate Limited Error - `class BetaManagedAgentsModelRateLimitedError:` The model request was rate-limited. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"model_rate_limited_error"ModelRateLimitedError` ### Beta Managed Agents Model Request Failed Error - `class BetaManagedAgentsModelRequestFailedError:` A model request failed for a reason other than overload or rate-limiting. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"model_request_failed_error"ModelRequestFailedError` ### Beta Managed Agents Plain Text Document Source - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` ### Beta Managed Agents Retry Status Exhausted - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` ### Beta Managed Agents Retry Status Retrying - `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. - `required Type Type` - `"retrying"Retrying` ### Beta Managed Agents Retry Status Terminal - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` ### Beta Managed Agents Search Result Block - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` ### Beta Managed Agents Search Result Citations - `class BetaManagedAgentsSearchResultCitations:` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. ### Beta Managed Agents Search Result Content - `class BetaManagedAgentsSearchResultContent:` Text content within a search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` ### Beta Managed Agents Send Session Events - `class BetaManagedAgentsSendSessionEvents:` Events that were successfully sent to the session. - `IReadOnlyList Data` Sent events - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `required string ID` Unique identifier for this event. - `required Type Type` - `"user.interrupt"UserInterrupt` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` 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. - `required string ID` Unique identifier for this event. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `required string ID` Unique identifier for this event. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList 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. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `required string ID` Unique identifier for this event. - `required string Description` What the agent should produce. Copied from the input event. - `required Int? MaxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `required string OutcomeID` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `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. - `required string ID` Unique identifier for this event. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `class BetaManagedAgentsSystemMessageEvent:` A mid-conversation system message event. Carries system-role content that is appended to the session as a `role: "system"` turn. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` System content blocks. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format ### Beta Managed Agents Session Deleted Event - `class BetaManagedAgentsSessionDeletedEvent:` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.deleted"SessionDeleted` ### Beta Managed Agents Session End Turn - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `required Type Type` - `"end_turn"EndTurn` ### Beta Managed Agents Session Error Event - `class BetaManagedAgentsSessionErrorEvent:` An error event indicating a problem occurred during session execution. - `required string ID` Unique identifier for this event. - `required Error Error` 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. - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"unknown_error"UnknownError` - `class BetaManagedAgentsModelOverloadedError:` The model is currently overloaded. Emitted after automatic retries are exhausted. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_overloaded_error"ModelOverloadedError` - `class BetaManagedAgentsModelRateLimitedError:` The model request was rate-limited. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_rate_limited_error"ModelRateLimitedError` - `class BetaManagedAgentsModelRequestFailedError:` A model request failed for a reason other than overload or rate-limiting. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_request_failed_error"ModelRequestFailedError` - `class BetaManagedAgentsMcpConnectionFailedError:` Failed to connect to an MCP server. - `required string McpServerName` Name of the MCP server that failed to connect. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_connection_failed_error"McpConnectionFailedError` - `class BetaManagedAgentsMcpAuthenticationFailedError:` Authentication to an MCP server failed. - `required string McpServerName` Name of the MCP server that failed authentication. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_authentication_failed_error"McpAuthenticationFailedError` - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"billing_error"BillingError` - `class BetaManagedAgentsCredentialHostUnreachableError:` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `required string CredentialID` ID of the affected credential. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"credential_host_unreachable_error"CredentialHostUnreachableError` - `required string VaultID` ID of the vault containing the affected credential. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.error"SessionError` ### Beta Managed Agents Session Event - `class BetaManagedAgentsSessionEvent: A class that can be one of several variants.union` Union type for all event types in a session. - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `required string ID` Unique identifier for this event. - `required Type Type` - `"user.interrupt"UserInterrupt` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` 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. - `required string ID` Unique identifier for this event. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `required string ID` Unique identifier for this event. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList 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. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the custom tool being called. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.custom_tool_use"AgentCustomToolUse` - `string? SessionThreadID` 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. Echo this on a `user.custom_tool_result` event to route the result back. - `class BetaManagedAgentsAgentMessageEvent:` An agent response event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of text blocks comprising the agent response. - `required string Text` The text content. - `required Type Type` - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.message"AgentMessage` - `class BetaManagedAgentsAgentThinkingEvent:` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thinking"AgentThinking` - `class BetaManagedAgentsAgentMcpToolUseEvent:` Event emitted when the agent invokes a tool provided by an MCP server. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string McpServerName` Name of the MCP server providing the tool. - `required string Name` Name of the MCP tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_use"AgentMcpToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentMcpToolResultEvent:` Event representing the result of an MCP tool execution. - `required string ID` Unique identifier for this event. - `required string McpToolUseID` The id of the `agent.mcp_tool_use` event this result corresponds to. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_result"AgentMcpToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent:` Event emitted when the agent invokes a built-in agent tool. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the agent tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.tool_use"AgentToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentToolResultEvent:` Event representing the result of an agent tool execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToolUseID` The id of the `agent.tool_use` event this result corresponds to. - `required Type Type` - `"agent.tool_result"AgentToolResult` - `IReadOnlyList 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. - `Boolean? IsError` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required string FromSessionThreadID` Public `sthr_` ID of the thread that sent the message. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_message_received"AgentThreadMessageReceived` - `string? FromAgentName` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToSessionThreadID` Public `sthr_` ID of the thread the message was sent to. - `required Type Type` - `"agent.thread_message_sent"AgentThreadMessageSent` - `string? ToAgentName` 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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_context_compacted"AgentThreadContextCompacted` - `class BetaManagedAgentsSessionErrorEvent:` An error event indicating a problem occurred during session execution. - `required string ID` Unique identifier for this event. - `required Error Error` 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. - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"unknown_error"UnknownError` - `class BetaManagedAgentsModelOverloadedError:` The model is currently overloaded. Emitted after automatic retries are exhausted. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_overloaded_error"ModelOverloadedError` - `class BetaManagedAgentsModelRateLimitedError:` The model request was rate-limited. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_rate_limited_error"ModelRateLimitedError` - `class BetaManagedAgentsModelRequestFailedError:` A model request failed for a reason other than overload or rate-limiting. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_request_failed_error"ModelRequestFailedError` - `class BetaManagedAgentsMcpConnectionFailedError:` Failed to connect to an MCP server. - `required string McpServerName` Name of the MCP server that failed to connect. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_connection_failed_error"McpConnectionFailedError` - `class BetaManagedAgentsMcpAuthenticationFailedError:` Authentication to an MCP server failed. - `required string McpServerName` Name of the MCP server that failed authentication. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_authentication_failed_error"McpAuthenticationFailedError` - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"billing_error"BillingError` - `class BetaManagedAgentsCredentialHostUnreachableError:` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `required string CredentialID` ID of the affected credential. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"credential_host_unreachable_error"CredentialHostUnreachableError` - `required string VaultID` ID of the vault containing the affected credential. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.error"SessionError` - `class BetaManagedAgentsSessionStatusRescheduledEvent:` Indicates the session is recovering from an error state and is rescheduled for execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_rescheduled"SessionStatusRescheduled` - `class BetaManagedAgentsSessionStatusRunningEvent:` Indicates the session is actively running and the agent is working. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_running"SessionStatusRunning` - `class BetaManagedAgentsSessionStatusIdleEvent:` Indicates the agent has paused and is awaiting user input. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `required Type Type` - `"end_turn"EndTurn` - `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. - `required IReadOnlyList EventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `required Type Type` - `"requires_action"RequiresAction` - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"retries_exhausted"RetriesExhausted` - `required Type Type` - `"session.status_idle"SessionStatusIdle` - `class BetaManagedAgentsSessionStatusTerminatedEvent:` Indicates the session has terminated, either due to an error or completion. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_terminated"SessionStatusTerminated` - `class BetaManagedAgentsSessionThreadCreatedEvent:` Emitted when a subagent is spawned as a new thread. Written to the parent thread's output stream so clients observing the session see child creation. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the callable agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public `sthr_` ID of the newly created thread. - `required Type Type` - `"session.thread_created"SessionThreadCreated` - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent:` Emitted when an outcome evaluation cycle begins. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_start"SpanOutcomeEvaluationStart` - `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. - `required string ID` Unique identifier for this event. - `required string Explanation` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeEvaluationStartID` The id of the corresponding `span.outcome_evaluation_start` event. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string Result` 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. - `required Type Type` - `"span.outcome_evaluation_end"SpanOutcomeEvaluationEnd` - `required BetaManagedAgentsSpanModelUsage Usage` Token usage for a single model request. - `required Int CacheCreationInputTokens` Tokens used to create prompt cache in this request. - `required Int CacheReadInputTokens` Tokens read from prompt cache in this request. - `required Int InputTokens` Input tokens consumed by this request. - `required Int OutputTokens` Output tokens generated by this request. - `Speed? Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `class BetaManagedAgentsSpanModelRequestStartEvent:` Emitted when a model request is initiated by the agent. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_start"SpanModelRequestStart` - `class BetaManagedAgentsSpanModelRequestEndEvent:` Emitted when a model request completes. - `required string ID` Unique identifier for this event. - `required Boolean? IsError` Whether the model request resulted in an error. - `required string ModelRequestStartID` The id of the corresponding `span.model_request_start` event. - `required BetaManagedAgentsSpanModelUsage ModelUsage` Token usage for a single model request. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_end"SpanModelRequestEnd` - `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. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_ongoing"SpanOutcomeEvaluationOngoing` - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `required string ID` Unique identifier for this event. - `required string Description` What the agent should produce. Copied from the input event. - `required Int? MaxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `required string OutcomeID` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `class BetaManagedAgentsSessionDeletedEvent:` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.deleted"SessionDeleted` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that started running. - `required Type Type` - `"session.thread_status_running"SessionThreadStatusRunning` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that went idle. - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `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 the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"session.thread_status_idle"SessionThreadStatusIdle` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that terminated. - `required Type Type` - `"session.thread_status_terminated"SessionThreadStatusTerminated` - `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. - `required string ID` Unique identifier for this event. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that is retrying. - `required Type Type` - `"session.thread_status_rescheduled"SessionThreadStatusRescheduled` - `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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.updated"SessionUpdated` - `BetaManagedAgentsSessionAgent? Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `IReadOnlyDictionary Metadata` 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. - `string? Title` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` System content blocks. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format ### Beta Managed Agents Session Requires Action - `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. - `required IReadOnlyList EventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `required Type Type` - `"requires_action"RequiresAction` ### Beta Managed Agents Session Retries Exhausted - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"retries_exhausted"RetriesExhausted` ### Beta Managed Agents Session Status Idle Event - `class BetaManagedAgentsSessionStatusIdleEvent:` Indicates the agent has paused and is awaiting user input. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `required Type Type` - `"end_turn"EndTurn` - `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. - `required IReadOnlyList EventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `required Type Type` - `"requires_action"RequiresAction` - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"retries_exhausted"RetriesExhausted` - `required Type Type` - `"session.status_idle"SessionStatusIdle` ### Beta Managed Agents Session Status Rescheduled Event - `class BetaManagedAgentsSessionStatusRescheduledEvent:` Indicates the session is recovering from an error state and is rescheduled for execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_rescheduled"SessionStatusRescheduled` ### Beta Managed Agents Session Status Running Event - `class BetaManagedAgentsSessionStatusRunningEvent:` Indicates the session is actively running and the agent is working. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_running"SessionStatusRunning` ### Beta Managed Agents Session Status Terminated Event - `class BetaManagedAgentsSessionStatusTerminatedEvent:` Indicates the session has terminated, either due to an error or completion. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_terminated"SessionStatusTerminated` ### Beta Managed Agents Session Thread Created Event - `class BetaManagedAgentsSessionThreadCreatedEvent:` Emitted when a subagent is spawned as a new thread. Written to the parent thread's output stream so clients observing the session see child creation. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the callable agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public `sthr_` ID of the newly created thread. - `required Type Type` - `"session.thread_created"SessionThreadCreated` ### Beta Managed Agents Session Thread Status Idle Event - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that went idle. - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `required Type Type` - `"end_turn"EndTurn` - `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. - `required IReadOnlyList EventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `required Type Type` - `"requires_action"RequiresAction` - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"retries_exhausted"RetriesExhausted` - `required Type Type` - `"session.thread_status_idle"SessionThreadStatusIdle` ### Beta Managed Agents Session Thread Status Rescheduled Event - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that is retrying. - `required Type Type` - `"session.thread_status_rescheduled"SessionThreadStatusRescheduled` ### Beta Managed Agents Session Thread Status Running Event - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that started running. - `required Type Type` - `"session.thread_status_running"SessionThreadStatusRunning` ### Beta Managed Agents Session Thread Status Terminated Event - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that terminated. - `required Type Type` - `"session.thread_status_terminated"SessionThreadStatusTerminated` ### Beta Managed Agents Span Model Request End Event - `class BetaManagedAgentsSpanModelRequestEndEvent:` Emitted when a model request completes. - `required string ID` Unique identifier for this event. - `required Boolean? IsError` Whether the model request resulted in an error. - `required string ModelRequestStartID` The id of the corresponding `span.model_request_start` event. - `required BetaManagedAgentsSpanModelUsage ModelUsage` Token usage for a single model request. - `required Int CacheCreationInputTokens` Tokens used to create prompt cache in this request. - `required Int CacheReadInputTokens` Tokens read from prompt cache in this request. - `required Int InputTokens` Input tokens consumed by this request. - `required Int OutputTokens` Output tokens generated by this request. - `Speed? Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_end"SpanModelRequestEnd` ### Beta Managed Agents Span Model Request Start Event - `class BetaManagedAgentsSpanModelRequestStartEvent:` Emitted when a model request is initiated by the agent. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_start"SpanModelRequestStart` ### Beta Managed Agents Span Model Usage - `class BetaManagedAgentsSpanModelUsage:` Token usage for a single model request. - `required Int CacheCreationInputTokens` Tokens used to create prompt cache in this request. - `required Int CacheReadInputTokens` Tokens read from prompt cache in this request. - `required Int InputTokens` Input tokens consumed by this request. - `required Int OutputTokens` Output tokens generated by this request. - `Speed? Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` ### Beta Managed Agents Span Outcome Evaluation End Event - `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. - `required string ID` Unique identifier for this event. - `required string Explanation` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeEvaluationStartID` The id of the corresponding `span.outcome_evaluation_start` event. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string Result` 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. - `required Type Type` - `"span.outcome_evaluation_end"SpanOutcomeEvaluationEnd` - `required BetaManagedAgentsSpanModelUsage Usage` Token usage for a single model request. - `required Int CacheCreationInputTokens` Tokens used to create prompt cache in this request. - `required Int CacheReadInputTokens` Tokens read from prompt cache in this request. - `required Int InputTokens` Input tokens consumed by this request. - `required Int OutputTokens` Output tokens generated by this request. - `Speed? Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` ### Beta Managed Agents Span Outcome Evaluation Ongoing Event - `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. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_ongoing"SpanOutcomeEvaluationOngoing` ### Beta Managed Agents Span Outcome Evaluation Start Event - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent:` Emitted when an outcome evaluation cycle begins. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_start"SpanOutcomeEvaluationStart` ### Beta Managed Agents Stream Session Events - `class BetaManagedAgentsStreamSessionEvents: A class that can be one of several variants.union` Server-sent event in the session stream. - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `required string ID` Unique identifier for this event. - `required Type Type` - `"user.interrupt"UserInterrupt` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` 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. - `required string ID` Unique identifier for this event. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `required string ID` Unique identifier for this event. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList 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. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the custom tool being called. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.custom_tool_use"AgentCustomToolUse` - `string? SessionThreadID` 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. Echo this on a `user.custom_tool_result` event to route the result back. - `class BetaManagedAgentsAgentMessageEvent:` An agent response event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of text blocks comprising the agent response. - `required string Text` The text content. - `required Type Type` - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.message"AgentMessage` - `class BetaManagedAgentsAgentThinkingEvent:` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thinking"AgentThinking` - `class BetaManagedAgentsAgentMcpToolUseEvent:` Event emitted when the agent invokes a tool provided by an MCP server. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string McpServerName` Name of the MCP server providing the tool. - `required string Name` Name of the MCP tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_use"AgentMcpToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentMcpToolResultEvent:` Event representing the result of an MCP tool execution. - `required string ID` Unique identifier for this event. - `required string McpToolUseID` The id of the `agent.mcp_tool_use` event this result corresponds to. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_result"AgentMcpToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent:` Event emitted when the agent invokes a built-in agent tool. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the agent tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.tool_use"AgentToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentToolResultEvent:` Event representing the result of an agent tool execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToolUseID` The id of the `agent.tool_use` event this result corresponds to. - `required Type Type` - `"agent.tool_result"AgentToolResult` - `IReadOnlyList 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. - `Boolean? IsError` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required string FromSessionThreadID` Public `sthr_` ID of the thread that sent the message. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_message_received"AgentThreadMessageReceived` - `string? FromAgentName` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToSessionThreadID` Public `sthr_` ID of the thread the message was sent to. - `required Type Type` - `"agent.thread_message_sent"AgentThreadMessageSent` - `string? ToAgentName` 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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_context_compacted"AgentThreadContextCompacted` - `class BetaManagedAgentsSessionErrorEvent:` An error event indicating a problem occurred during session execution. - `required string ID` Unique identifier for this event. - `required Error Error` 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. - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"unknown_error"UnknownError` - `class BetaManagedAgentsModelOverloadedError:` The model is currently overloaded. Emitted after automatic retries are exhausted. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_overloaded_error"ModelOverloadedError` - `class BetaManagedAgentsModelRateLimitedError:` The model request was rate-limited. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_rate_limited_error"ModelRateLimitedError` - `class BetaManagedAgentsModelRequestFailedError:` A model request failed for a reason other than overload or rate-limiting. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_request_failed_error"ModelRequestFailedError` - `class BetaManagedAgentsMcpConnectionFailedError:` Failed to connect to an MCP server. - `required string McpServerName` Name of the MCP server that failed to connect. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_connection_failed_error"McpConnectionFailedError` - `class BetaManagedAgentsMcpAuthenticationFailedError:` Authentication to an MCP server failed. - `required string McpServerName` Name of the MCP server that failed authentication. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_authentication_failed_error"McpAuthenticationFailedError` - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"billing_error"BillingError` - `class BetaManagedAgentsCredentialHostUnreachableError:` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `required string CredentialID` ID of the affected credential. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"credential_host_unreachable_error"CredentialHostUnreachableError` - `required string VaultID` ID of the vault containing the affected credential. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.error"SessionError` - `class BetaManagedAgentsSessionStatusRescheduledEvent:` Indicates the session is recovering from an error state and is rescheduled for execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_rescheduled"SessionStatusRescheduled` - `class BetaManagedAgentsSessionStatusRunningEvent:` Indicates the session is actively running and the agent is working. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_running"SessionStatusRunning` - `class BetaManagedAgentsSessionStatusIdleEvent:` Indicates the agent has paused and is awaiting user input. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `required Type Type` - `"end_turn"EndTurn` - `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. - `required IReadOnlyList EventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `required Type Type` - `"requires_action"RequiresAction` - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"retries_exhausted"RetriesExhausted` - `required Type Type` - `"session.status_idle"SessionStatusIdle` - `class BetaManagedAgentsSessionStatusTerminatedEvent:` Indicates the session has terminated, either due to an error or completion. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_terminated"SessionStatusTerminated` - `class BetaManagedAgentsSessionThreadCreatedEvent:` Emitted when a subagent is spawned as a new thread. Written to the parent thread's output stream so clients observing the session see child creation. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the callable agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public `sthr_` ID of the newly created thread. - `required Type Type` - `"session.thread_created"SessionThreadCreated` - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent:` Emitted when an outcome evaluation cycle begins. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_start"SpanOutcomeEvaluationStart` - `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. - `required string ID` Unique identifier for this event. - `required string Explanation` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeEvaluationStartID` The id of the corresponding `span.outcome_evaluation_start` event. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string Result` 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. - `required Type Type` - `"span.outcome_evaluation_end"SpanOutcomeEvaluationEnd` - `required BetaManagedAgentsSpanModelUsage Usage` Token usage for a single model request. - `required Int CacheCreationInputTokens` Tokens used to create prompt cache in this request. - `required Int CacheReadInputTokens` Tokens read from prompt cache in this request. - `required Int InputTokens` Input tokens consumed by this request. - `required Int OutputTokens` Output tokens generated by this request. - `Speed? Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `class BetaManagedAgentsSpanModelRequestStartEvent:` Emitted when a model request is initiated by the agent. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_start"SpanModelRequestStart` - `class BetaManagedAgentsSpanModelRequestEndEvent:` Emitted when a model request completes. - `required string ID` Unique identifier for this event. - `required Boolean? IsError` Whether the model request resulted in an error. - `required string ModelRequestStartID` The id of the corresponding `span.model_request_start` event. - `required BetaManagedAgentsSpanModelUsage ModelUsage` Token usage for a single model request. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_end"SpanModelRequestEnd` - `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. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_ongoing"SpanOutcomeEvaluationOngoing` - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `required string ID` Unique identifier for this event. - `required string Description` What the agent should produce. Copied from the input event. - `required Int? MaxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `required string OutcomeID` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `class BetaManagedAgentsSessionDeletedEvent:` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.deleted"SessionDeleted` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that started running. - `required Type Type` - `"session.thread_status_running"SessionThreadStatusRunning` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that went idle. - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `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 the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"session.thread_status_idle"SessionThreadStatusIdle` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that terminated. - `required Type Type` - `"session.thread_status_terminated"SessionThreadStatusTerminated` - `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. - `required string ID` Unique identifier for this event. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that is retrying. - `required Type Type` - `"session.thread_status_rescheduled"SessionThreadStatusRescheduled` - `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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.updated"SessionUpdated` - `BetaManagedAgentsSessionAgent? Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `IReadOnlyDictionary Metadata` 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. - `string? Title` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` System content blocks. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format ### Beta Managed Agents System Message Event Params - `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. - `required IReadOnlyList Content` System content blocks to append. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` ### Beta Managed Agents Text Block - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` ### Beta Managed Agents Text Rubric - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `required Type Type` - `"text"Text` ### Beta Managed Agents Text Rubric Params - `class BetaManagedAgentsTextRubricParams:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. Maximum 262144 characters. - `required Type Type` - `"text"Text` ### Beta Managed Agents Unknown 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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"unknown_error"UnknownError` ### Beta Managed Agents URL Document Source - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. ### Beta Managed Agents URL Image Source - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. ### Beta Managed Agents User Custom Tool Result Event - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `required string ID` Unique identifier for this event. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList Content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. ### Beta Managed Agents User Custom Tool Result Event Params - `class BetaManagedAgentsUserCustomToolResultEventParams:` Parameters for providing the result of a custom tool execution. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList Content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. ### Beta Managed Agents User Define Outcome Event - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `required string ID` Unique identifier for this event. - `required string Description` What the agent should produce. Copied from the input event. - `required Int? MaxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `required string OutcomeID` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` ### Beta Managed Agents User Define Outcome Event Params - `class BetaManagedAgentsUserDefineOutcomeEventParams:` Parameters for defining an outcome the agent should work toward. The agent begins work on receipt. - `required string Description` What the agent should produce. This is the task specification. - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubricParams:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubricParams:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. Maximum 262144 characters. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `Int? MaxIterations` Eval→revision cycles before giving up. Default 3, max 20. ### Beta Managed Agents User Interrupt Event - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `required string ID` Unique identifier for this event. - `required Type Type` - `"user.interrupt"UserInterrupt` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` 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. ### Beta Managed Agents User Interrupt Event Params - `class BetaManagedAgentsUserInterruptEventParams:` Parameters for sending an interrupt to pause the agent. - `required Type Type` - `"user.interrupt"UserInterrupt` - `string? SessionThreadID` 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. ### Beta Managed Agents User Message Event - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format ### Beta Managed Agents User Message Event Params - `class BetaManagedAgentsUserMessageEventParams:` Parameters for sending a user message to the session. - `required IReadOnlyList Content` Array of content blocks for the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` ### Beta Managed Agents User Tool Confirmation Event - `class BetaManagedAgentsUserToolConfirmationEvent:` A tool confirmation event that approves or denies a pending tool execution. - `required string ID` Unique identifier for this event. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. ### Beta Managed Agents User Tool Confirmation Event Params - `class BetaManagedAgentsUserToolConfirmationEventParams:` Parameters for confirming or denying a tool execution request. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. ### Beta Managed Agents User Tool Result Event Params - `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. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList Content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. # Resources ## Add Session Resource `BetaManagedAgentsFileResource Beta.Sessions.Resources.Add(ResourceAddParamsparameters, CancellationTokencancellationToken = default)` **post** `/v1/sessions/{session_id}/resources` Add Session Resource ### Parameters - `ResourceAddParams parameters` - `required string sessionID` Path param: Path parameter session_id - `required string fileID` Body param: ID of a previously uploaded file. - `required Type type` Body param - `"file"File` - `string? mountPath` Body param: Mount path in the container. Defaults to `/mnt/session/uploads/`. - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format ### Example ```csharp ResourceAddParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7", FileID = "file_011CNha8iCJcU1wXNR6q4V8w", Type = Type.File, }; var betaManagedAgentsFileResource = await client.Beta.Sessions.Resources.Add(parameters); Console.WriteLine(betaManagedAgentsFileResource); ``` #### Response ```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 `ResourceListPageResponse Beta.Sessions.Resources.List(ResourceListParamsparameters, CancellationTokencancellationToken = default)` **get** `/v1/sessions/{session_id}/resources` List Session Resources ### Parameters - `ResourceListParams parameters` - `required string sessionID` Path param: Path parameter session_id - `Int limit` Query param: Maximum number of resources to return per page (max 1000). If omitted, returns all resources. - `string page` Query param: Opaque cursor from a previous response's next_page field. - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class ResourceListPageResponse:` Paginated list of resources attached to a session. - `required IReadOnlyList Data` Resources for the session, ordered by `created_at`. - `class BetaManagedAgentsGitHubRepositoryResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string MountPath` - `required Type Type` - `"github_repository"GitHubRepository` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required string Url` - `Checkout? Checkout` - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsMemoryStoreResource:` A memory store attached to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string Description` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? MountPath` 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. - `string? Name` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. - `string? NextPage` Opaque cursor for the next page. Null when no more results. ### Example ```csharp ResourceListParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7" }; var page = await client.Beta.Sessions.Resources.List(parameters); await foreach (var item in page.Paginate()) { Console.WriteLine(item); } ``` #### Response ```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_011CZkZCKr6eXyl0gWMOdQiu", "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 `ResourceRetrieveResponse Beta.Sessions.Resources.Retrieve(ResourceRetrieveParamsparameters, CancellationTokencancellationToken = default)` **get** `/v1/sessions/{session_id}/resources/{resource_id}` Get Session Resource ### Parameters - `ResourceRetrieveParams parameters` - `required string sessionID` Path param: Path parameter session_id - `required string resourceID` Path param: Path parameter resource_id - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class ResourceRetrieveResponse: A class that can be one of several variants.union` The requested session resource. - `class BetaManagedAgentsGitHubRepositoryResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string MountPath` - `required Type Type` - `"github_repository"GitHubRepository` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required string Url` - `Checkout? Checkout` - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsMemoryStoreResource:` A memory store attached to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string Description` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? MountPath` 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. - `string? Name` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. ### Example ```csharp ResourceRetrieveParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7", ResourceID = "sesrsc_011CZkZBJq5dWxk9fVLNcPht", }; var resource = await client.Beta.Sessions.Resources.Retrieve(parameters); Console.WriteLine(resource); ``` #### Response ```json { "id": "sesrsc_011CZkZCKr6eXyl0gWMOdQiu", "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 `ResourceUpdateResponse Beta.Sessions.Resources.Update(ResourceUpdateParamsparameters, CancellationTokencancellationToken = default)` **post** `/v1/sessions/{session_id}/resources/{resource_id}` Update Session Resource ### Parameters - `ResourceUpdateParams parameters` - `required string sessionID` Path param: Path parameter session_id - `required string resourceID` Path param: Path parameter resource_id - `required string authorizationToken` Body param: New authorization token for the resource. Currently only `github_repository` resources support token rotation. - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class ResourceUpdateResponse: A class that can be one of several variants.union` The updated session resource. - `class BetaManagedAgentsGitHubRepositoryResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string MountPath` - `required Type Type` - `"github_repository"GitHubRepository` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required string Url` - `Checkout? Checkout` - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsMemoryStoreResource:` A memory store attached to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string Description` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? MountPath` 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. - `string? Name` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. ### Example ```csharp ResourceUpdateParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7", ResourceID = "sesrsc_011CZkZBJq5dWxk9fVLNcPht", AuthorizationToken = "ghp_exampletoken", }; var resource = await client.Beta.Sessions.Resources.Update(parameters); Console.WriteLine(resource); ``` #### Response ```json { "id": "sesrsc_011CZkZCKr6eXyl0gWMOdQiu", "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 `BetaManagedAgentsDeleteSessionResource Beta.Sessions.Resources.Delete(ResourceDeleteParamsparameters, CancellationTokencancellationToken = default)` **delete** `/v1/sessions/{session_id}/resources/{resource_id}` Delete Session Resource ### Parameters - `ResourceDeleteParams parameters` - `required string sessionID` Path param: Path parameter session_id - `required string resourceID` Path param: Path parameter resource_id - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsDeleteSessionResource:` Confirmation of resource deletion. - `required string ID` - `required Type Type` - `"session_resource_deleted"SessionResourceDeleted` ### Example ```csharp ResourceDeleteParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7", ResourceID = "sesrsc_011CZkZBJq5dWxk9fVLNcPht", }; var betaManagedAgentsDeleteSessionResource = await client.Beta.Sessions.Resources.Delete(parameters); Console.WriteLine(betaManagedAgentsDeleteSessionResource); ``` #### Response ```json { "id": "sesrsc_011CZkZBJq5dWxk9fVLNcPht", "type": "session_resource_deleted" } ``` ## Domain Types ### Beta Managed Agents Delete Session Resource - `class BetaManagedAgentsDeleteSessionResource:` Confirmation of resource deletion. - `required string ID` - `required Type Type` - `"session_resource_deleted"SessionResourceDeleted` ### Beta Managed Agents File Resource - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format ### Beta Managed Agents GitHub Repository Resource - `class BetaManagedAgentsGitHubRepositoryResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string MountPath` - `required Type Type` - `"github_repository"GitHubRepository` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required string Url` - `Checkout? Checkout` - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` ### Beta Managed Agents Memory Store Resource - `class BetaManagedAgentsMemoryStoreResource:` A memory store attached to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string Description` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? MountPath` 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. - `string? Name` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. ### Beta Managed Agents Session Resource - `class BetaManagedAgentsSessionResource: A class that can be one of several variants.union` A memory store attached to an agent session. - `class BetaManagedAgentsGitHubRepositoryResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string MountPath` - `required Type Type` - `"github_repository"GitHubRepository` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required string Url` - `Checkout? Checkout` - `class BetaManagedAgentsBranchCheckout:` - `required string Name` Branch name to check out. - `required Type Type` - `"branch"Branch` - `class BetaManagedAgentsCommitCheckout:` - `required string Sha` Full commit SHA to check out. - `required Type Type` - `"commit"Commit` - `class BetaManagedAgentsFileResource:` - `required string ID` - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string FileID` - `required string MountPath` - `required Type Type` - `"file"File` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsMemoryStoreResource:` A memory store attached to an agent session. - `required string MemoryStoreID` The memory store ID (memstore_...). Must belong to the caller's organization and workspace. - `required Type Type` - `"memory_store"MemoryStore` - `Access? Access` Access mode for an attached memory store. - `"read_write"ReadWrite` - `"read_only"ReadOnly` - `string Description` Description of the memory store, snapshotted at attach time. Rendered into the agent's system prompt. Empty string when the store has no description. - `string? Instructions` Per-attachment guidance for the agent on how to use this store. Rendered into the memory section of the system prompt. Max 4096 chars. - `string? MountPath` 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. - `string? Name` Display name of the memory store, snapshotted at attach time. Later edits to the store's name do not propagate to this resource. # Threads ## List Session Threads `ThreadListPageResponse Beta.Sessions.Threads.List(ThreadListParamsparameters, CancellationTokencancellationToken = default)` **get** `/v1/sessions/{session_id}/threads` List Session Threads ### Parameters - `ThreadListParams parameters` - `required string sessionID` Path param: Path parameter session_id - `Int limit` Query param: Maximum results per page. Defaults to 1000. - `string page` Query param: Opaque pagination cursor from a previous response's next_page. Forward-only. - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class ThreadListPageResponse:` Paginated list of threads within a `session`. - `IReadOnlyList Data` Threads in the session, primary first then children in spawn order. - `required string ID` Unique identifier for this thread. - `required BetaManagedAgentsSessionThreadAgent Agent` 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`. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required DateTimeOffset? ArchivedAt` A timestamp in RFC 3339 format - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string? ParentThreadID` Parent thread that spawned this thread. Null for the primary thread. - `required string SessionID` The session this thread belongs to. - `required BetaManagedAgentsSessionThreadStats? Stats` Timing statistics for a session thread. - `Double ActiveSeconds` Cumulative time in seconds the thread spent actively running. Excludes idle time. - `Double DurationSeconds` Elapsed time since thread creation in seconds. For archived threads, frozen at the final update. - `Double StartupSeconds` Time in seconds for the thread to begin running. Zero for child threads, which start immediately. - `required BetaManagedAgentsSessionThreadStatus Status` SessionThreadStatus enum - `"running"Running` - `"idle"Idle` - `"rescheduling"Rescheduling` - `"terminated"Terminated` - `required Type Type` - `"session_thread"SessionThread` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required BetaManagedAgentsSessionThreadUsage? Usage` Cumulative token usage for a session thread across all turns. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. - `string? NextPage` Opaque cursor for the next page. Null when no more results. ### Example ```csharp ThreadListParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7" }; var page = await client.Beta.Sessions.Threads.List(parameters); await foreach (var item in page.Paginate()) { Console.WriteLine(item); } ``` #### Response ```json { "data": [ { "id": "sthr_011CZkZVWa6oIjw0rgXZpnBt", "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-sonnet-4-6", "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" } } ], "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": { "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "output_tokens": 0 } } ], "next_page": "page_MjAyNS0wNS0xNFQwMDowMDowMFo=" } ``` ## Get Session Thread `BetaManagedAgentsSessionThread Beta.Sessions.Threads.Retrieve(ThreadRetrieveParamsparameters, CancellationTokencancellationToken = default)` **get** `/v1/sessions/{session_id}/threads/{thread_id}` Get Session Thread ### Parameters - `ThreadRetrieveParams parameters` - `required string sessionID` Path param: Path parameter session_id - `required string threadID` Path param: Path parameter thread_id - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsSessionThread:` An execution thread within a `session`. Each session has one primary thread plus zero or more child threads spawned by the coordinator. - `required string ID` Unique identifier for this thread. - `required BetaManagedAgentsSessionThreadAgent Agent` 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`. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required DateTimeOffset? ArchivedAt` A timestamp in RFC 3339 format - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string? ParentThreadID` Parent thread that spawned this thread. Null for the primary thread. - `required string SessionID` The session this thread belongs to. - `required BetaManagedAgentsSessionThreadStats? Stats` Timing statistics for a session thread. - `Double ActiveSeconds` Cumulative time in seconds the thread spent actively running. Excludes idle time. - `Double DurationSeconds` Elapsed time since thread creation in seconds. For archived threads, frozen at the final update. - `Double StartupSeconds` Time in seconds for the thread to begin running. Zero for child threads, which start immediately. - `required BetaManagedAgentsSessionThreadStatus Status` SessionThreadStatus enum - `"running"Running` - `"idle"Idle` - `"rescheduling"Rescheduling` - `"terminated"Terminated` - `required Type Type` - `"session_thread"SessionThread` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required BetaManagedAgentsSessionThreadUsage? Usage` Cumulative token usage for a session thread across all turns. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. ### Example ```csharp ThreadRetrieveParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7", ThreadID = "sthr_011CZkZVWa6oIjw0rgXZpnBt", }; var betaManagedAgentsSessionThread = await client.Beta.Sessions.Threads.Retrieve(parameters); Console.WriteLine(betaManagedAgentsSessionThread); ``` #### Response ```json { "id": "sthr_011CZkZVWa6oIjw0rgXZpnBt", "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-sonnet-4-6", "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" } } ], "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": { "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "output_tokens": 0 } } ``` ## Archive Session Thread `BetaManagedAgentsSessionThread Beta.Sessions.Threads.Archive(ThreadArchiveParamsparameters, CancellationTokencancellationToken = default)` **post** `/v1/sessions/{session_id}/threads/{thread_id}/archive` Archive Session Thread ### Parameters - `ThreadArchiveParams parameters` - `required string sessionID` Path param: Path parameter session_id - `required string threadID` Path param: Path parameter thread_id - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsSessionThread:` An execution thread within a `session`. Each session has one primary thread plus zero or more child threads spawned by the coordinator. - `required string ID` Unique identifier for this thread. - `required BetaManagedAgentsSessionThreadAgent Agent` 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`. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required DateTimeOffset? ArchivedAt` A timestamp in RFC 3339 format - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string? ParentThreadID` Parent thread that spawned this thread. Null for the primary thread. - `required string SessionID` The session this thread belongs to. - `required BetaManagedAgentsSessionThreadStats? Stats` Timing statistics for a session thread. - `Double ActiveSeconds` Cumulative time in seconds the thread spent actively running. Excludes idle time. - `Double DurationSeconds` Elapsed time since thread creation in seconds. For archived threads, frozen at the final update. - `Double StartupSeconds` Time in seconds for the thread to begin running. Zero for child threads, which start immediately. - `required BetaManagedAgentsSessionThreadStatus Status` SessionThreadStatus enum - `"running"Running` - `"idle"Idle` - `"rescheduling"Rescheduling` - `"terminated"Terminated` - `required Type Type` - `"session_thread"SessionThread` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required BetaManagedAgentsSessionThreadUsage? Usage` Cumulative token usage for a session thread across all turns. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. ### Example ```csharp ThreadArchiveParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7", ThreadID = "sthr_011CZkZVWa6oIjw0rgXZpnBt", }; var betaManagedAgentsSessionThread = await client.Beta.Sessions.Threads.Archive(parameters); Console.WriteLine(betaManagedAgentsSessionThread); ``` #### Response ```json { "id": "sthr_011CZkZVWa6oIjw0rgXZpnBt", "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-sonnet-4-6", "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" } } ], "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": { "cache_creation": { "ephemeral_1h_input_tokens": 0, "ephemeral_5m_input_tokens": 0 }, "cache_read_input_tokens": 0, "input_tokens": 0, "output_tokens": 0 } } ``` ## Domain Types ### Beta Managed Agents Session Thread - `class BetaManagedAgentsSessionThread:` An execution thread within a `session`. Each session has one primary thread plus zero or more child threads spawned by the coordinator. - `required string ID` Unique identifier for this thread. - `required BetaManagedAgentsSessionThreadAgent Agent` 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`. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required DateTimeOffset? ArchivedAt` A timestamp in RFC 3339 format - `required DateTimeOffset CreatedAt` A timestamp in RFC 3339 format - `required string? ParentThreadID` Parent thread that spawned this thread. Null for the primary thread. - `required string SessionID` The session this thread belongs to. - `required BetaManagedAgentsSessionThreadStats? Stats` Timing statistics for a session thread. - `Double ActiveSeconds` Cumulative time in seconds the thread spent actively running. Excludes idle time. - `Double DurationSeconds` Elapsed time since thread creation in seconds. For archived threads, frozen at the final update. - `Double StartupSeconds` Time in seconds for the thread to begin running. Zero for child threads, which start immediately. - `required BetaManagedAgentsSessionThreadStatus Status` SessionThreadStatus enum - `"running"Running` - `"idle"Idle` - `"rescheduling"Rescheduling` - `"terminated"Terminated` - `required Type Type` - `"session_thread"SessionThread` - `required DateTimeOffset UpdatedAt` A timestamp in RFC 3339 format - `required BetaManagedAgentsSessionThreadUsage? Usage` Cumulative token usage for a session thread across all turns. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. ### Beta Managed Agents Session Thread Stats - `class BetaManagedAgentsSessionThreadStats:` Timing statistics for a session thread. - `Double ActiveSeconds` Cumulative time in seconds the thread spent actively running. Excludes idle time. - `Double DurationSeconds` Elapsed time since thread creation in seconds. For archived threads, frozen at the final update. - `Double StartupSeconds` Time in seconds for the thread to begin running. Zero for child threads, which start immediately. ### Beta Managed Agents Session Thread Status - `enum BetaManagedAgentsSessionThreadStatus:` SessionThreadStatus enum - `"running"Running` - `"idle"Idle` - `"rescheduling"Rescheduling` - `"terminated"Terminated` ### Beta Managed Agents Session Thread Usage - `class BetaManagedAgentsSessionThreadUsage:` Cumulative token usage for a session thread across all turns. - `BetaManagedAgentsCacheCreationUsage CacheCreation` Prompt-cache creation token usage broken down by cache lifetime. - `Int Ephemeral1hInputTokens` Tokens used to create 1-hour ephemeral cache entries. - `Int Ephemeral5mInputTokens` Tokens used to create 5-minute ephemeral cache entries. - `Int CacheReadInputTokens` Total tokens read from prompt cache. - `Int InputTokens` Total input tokens consumed across all turns. - `Int OutputTokens` Total output tokens generated across all turns. ### Beta Managed Agents Stream Session Thread Events - `class BetaManagedAgentsStreamSessionThreadEvents: A class that can be one of several variants.union` Server-sent event in a single thread's stream. - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `required string ID` Unique identifier for this event. - `required Type Type` - `"user.interrupt"UserInterrupt` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` 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. - `required string ID` Unique identifier for this event. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `required string ID` Unique identifier for this event. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList 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. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the custom tool being called. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.custom_tool_use"AgentCustomToolUse` - `string? SessionThreadID` 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. Echo this on a `user.custom_tool_result` event to route the result back. - `class BetaManagedAgentsAgentMessageEvent:` An agent response event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of text blocks comprising the agent response. - `required string Text` The text content. - `required Type Type` - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.message"AgentMessage` - `class BetaManagedAgentsAgentThinkingEvent:` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thinking"AgentThinking` - `class BetaManagedAgentsAgentMcpToolUseEvent:` Event emitted when the agent invokes a tool provided by an MCP server. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string McpServerName` Name of the MCP server providing the tool. - `required string Name` Name of the MCP tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_use"AgentMcpToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentMcpToolResultEvent:` Event representing the result of an MCP tool execution. - `required string ID` Unique identifier for this event. - `required string McpToolUseID` The id of the `agent.mcp_tool_use` event this result corresponds to. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_result"AgentMcpToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent:` Event emitted when the agent invokes a built-in agent tool. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the agent tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.tool_use"AgentToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentToolResultEvent:` Event representing the result of an agent tool execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToolUseID` The id of the `agent.tool_use` event this result corresponds to. - `required Type Type` - `"agent.tool_result"AgentToolResult` - `IReadOnlyList 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. - `Boolean? IsError` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required string FromSessionThreadID` Public `sthr_` ID of the thread that sent the message. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_message_received"AgentThreadMessageReceived` - `string? FromAgentName` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToSessionThreadID` Public `sthr_` ID of the thread the message was sent to. - `required Type Type` - `"agent.thread_message_sent"AgentThreadMessageSent` - `string? ToAgentName` 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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_context_compacted"AgentThreadContextCompacted` - `class BetaManagedAgentsSessionErrorEvent:` An error event indicating a problem occurred during session execution. - `required string ID` Unique identifier for this event. - `required Error Error` 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. - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"unknown_error"UnknownError` - `class BetaManagedAgentsModelOverloadedError:` The model is currently overloaded. Emitted after automatic retries are exhausted. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_overloaded_error"ModelOverloadedError` - `class BetaManagedAgentsModelRateLimitedError:` The model request was rate-limited. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_rate_limited_error"ModelRateLimitedError` - `class BetaManagedAgentsModelRequestFailedError:` A model request failed for a reason other than overload or rate-limiting. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_request_failed_error"ModelRequestFailedError` - `class BetaManagedAgentsMcpConnectionFailedError:` Failed to connect to an MCP server. - `required string McpServerName` Name of the MCP server that failed to connect. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_connection_failed_error"McpConnectionFailedError` - `class BetaManagedAgentsMcpAuthenticationFailedError:` Authentication to an MCP server failed. - `required string McpServerName` Name of the MCP server that failed authentication. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_authentication_failed_error"McpAuthenticationFailedError` - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"billing_error"BillingError` - `class BetaManagedAgentsCredentialHostUnreachableError:` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `required string CredentialID` ID of the affected credential. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"credential_host_unreachable_error"CredentialHostUnreachableError` - `required string VaultID` ID of the vault containing the affected credential. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.error"SessionError` - `class BetaManagedAgentsSessionStatusRescheduledEvent:` Indicates the session is recovering from an error state and is rescheduled for execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_rescheduled"SessionStatusRescheduled` - `class BetaManagedAgentsSessionStatusRunningEvent:` Indicates the session is actively running and the agent is working. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_running"SessionStatusRunning` - `class BetaManagedAgentsSessionStatusIdleEvent:` Indicates the agent has paused and is awaiting user input. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `required Type Type` - `"end_turn"EndTurn` - `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. - `required IReadOnlyList EventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `required Type Type` - `"requires_action"RequiresAction` - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"retries_exhausted"RetriesExhausted` - `required Type Type` - `"session.status_idle"SessionStatusIdle` - `class BetaManagedAgentsSessionStatusTerminatedEvent:` Indicates the session has terminated, either due to an error or completion. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_terminated"SessionStatusTerminated` - `class BetaManagedAgentsSessionThreadCreatedEvent:` Emitted when a subagent is spawned as a new thread. Written to the parent thread's output stream so clients observing the session see child creation. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the callable agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public `sthr_` ID of the newly created thread. - `required Type Type` - `"session.thread_created"SessionThreadCreated` - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent:` Emitted when an outcome evaluation cycle begins. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_start"SpanOutcomeEvaluationStart` - `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. - `required string ID` Unique identifier for this event. - `required string Explanation` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeEvaluationStartID` The id of the corresponding `span.outcome_evaluation_start` event. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string Result` 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. - `required Type Type` - `"span.outcome_evaluation_end"SpanOutcomeEvaluationEnd` - `required BetaManagedAgentsSpanModelUsage Usage` Token usage for a single model request. - `required Int CacheCreationInputTokens` Tokens used to create prompt cache in this request. - `required Int CacheReadInputTokens` Tokens read from prompt cache in this request. - `required Int InputTokens` Input tokens consumed by this request. - `required Int OutputTokens` Output tokens generated by this request. - `Speed? Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `class BetaManagedAgentsSpanModelRequestStartEvent:` Emitted when a model request is initiated by the agent. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_start"SpanModelRequestStart` - `class BetaManagedAgentsSpanModelRequestEndEvent:` Emitted when a model request completes. - `required string ID` Unique identifier for this event. - `required Boolean? IsError` Whether the model request resulted in an error. - `required string ModelRequestStartID` The id of the corresponding `span.model_request_start` event. - `required BetaManagedAgentsSpanModelUsage ModelUsage` Token usage for a single model request. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_end"SpanModelRequestEnd` - `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. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_ongoing"SpanOutcomeEvaluationOngoing` - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `required string ID` Unique identifier for this event. - `required string Description` What the agent should produce. Copied from the input event. - `required Int? MaxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `required string OutcomeID` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `class BetaManagedAgentsSessionDeletedEvent:` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.deleted"SessionDeleted` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that started running. - `required Type Type` - `"session.thread_status_running"SessionThreadStatusRunning` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that went idle. - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `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 the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"session.thread_status_idle"SessionThreadStatusIdle` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that terminated. - `required Type Type` - `"session.thread_status_terminated"SessionThreadStatusTerminated` - `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. - `required string ID` Unique identifier for this event. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that is retrying. - `required Type Type` - `"session.thread_status_rescheduled"SessionThreadStatusRescheduled` - `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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.updated"SessionUpdated` - `BetaManagedAgentsSessionAgent? Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `IReadOnlyDictionary Metadata` 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. - `string? Title` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` System content blocks. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format # Events ## List Session Thread Events `EventListPageResponse Beta.Sessions.Threads.Events.List(EventListParamsparameters, CancellationTokencancellationToken = default)` **get** `/v1/sessions/{session_id}/threads/{thread_id}/events` List Session Thread Events ### Parameters - `EventListParams parameters` - `required string sessionID` Path param: Path parameter session_id - `required string threadID` Path param: Path parameter thread_id - `Int limit` Query param: Query parameter for limit - `string page` Query param: Query parameter for page - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class EventListPageResponse:` Paginated list of events for a single thread within a `session`. - `IReadOnlyList Data` Events for the thread, ordered by `created_at`. - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `required string ID` Unique identifier for this event. - `required Type Type` - `"user.interrupt"UserInterrupt` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` 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. - `required string ID` Unique identifier for this event. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `required string ID` Unique identifier for this event. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList 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. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the custom tool being called. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.custom_tool_use"AgentCustomToolUse` - `string? SessionThreadID` 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. Echo this on a `user.custom_tool_result` event to route the result back. - `class BetaManagedAgentsAgentMessageEvent:` An agent response event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of text blocks comprising the agent response. - `required string Text` The text content. - `required Type Type` - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.message"AgentMessage` - `class BetaManagedAgentsAgentThinkingEvent:` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thinking"AgentThinking` - `class BetaManagedAgentsAgentMcpToolUseEvent:` Event emitted when the agent invokes a tool provided by an MCP server. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string McpServerName` Name of the MCP server providing the tool. - `required string Name` Name of the MCP tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_use"AgentMcpToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentMcpToolResultEvent:` Event representing the result of an MCP tool execution. - `required string ID` Unique identifier for this event. - `required string McpToolUseID` The id of the `agent.mcp_tool_use` event this result corresponds to. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_result"AgentMcpToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent:` Event emitted when the agent invokes a built-in agent tool. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the agent tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.tool_use"AgentToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentToolResultEvent:` Event representing the result of an agent tool execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToolUseID` The id of the `agent.tool_use` event this result corresponds to. - `required Type Type` - `"agent.tool_result"AgentToolResult` - `IReadOnlyList 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. - `Boolean? IsError` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required string FromSessionThreadID` Public `sthr_` ID of the thread that sent the message. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_message_received"AgentThreadMessageReceived` - `string? FromAgentName` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToSessionThreadID` Public `sthr_` ID of the thread the message was sent to. - `required Type Type` - `"agent.thread_message_sent"AgentThreadMessageSent` - `string? ToAgentName` 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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_context_compacted"AgentThreadContextCompacted` - `class BetaManagedAgentsSessionErrorEvent:` An error event indicating a problem occurred during session execution. - `required string ID` Unique identifier for this event. - `required Error Error` 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. - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"unknown_error"UnknownError` - `class BetaManagedAgentsModelOverloadedError:` The model is currently overloaded. Emitted after automatic retries are exhausted. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_overloaded_error"ModelOverloadedError` - `class BetaManagedAgentsModelRateLimitedError:` The model request was rate-limited. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_rate_limited_error"ModelRateLimitedError` - `class BetaManagedAgentsModelRequestFailedError:` A model request failed for a reason other than overload or rate-limiting. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_request_failed_error"ModelRequestFailedError` - `class BetaManagedAgentsMcpConnectionFailedError:` Failed to connect to an MCP server. - `required string McpServerName` Name of the MCP server that failed to connect. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_connection_failed_error"McpConnectionFailedError` - `class BetaManagedAgentsMcpAuthenticationFailedError:` Authentication to an MCP server failed. - `required string McpServerName` Name of the MCP server that failed authentication. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_authentication_failed_error"McpAuthenticationFailedError` - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"billing_error"BillingError` - `class BetaManagedAgentsCredentialHostUnreachableError:` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `required string CredentialID` ID of the affected credential. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"credential_host_unreachable_error"CredentialHostUnreachableError` - `required string VaultID` ID of the vault containing the affected credential. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.error"SessionError` - `class BetaManagedAgentsSessionStatusRescheduledEvent:` Indicates the session is recovering from an error state and is rescheduled for execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_rescheduled"SessionStatusRescheduled` - `class BetaManagedAgentsSessionStatusRunningEvent:` Indicates the session is actively running and the agent is working. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_running"SessionStatusRunning` - `class BetaManagedAgentsSessionStatusIdleEvent:` Indicates the agent has paused and is awaiting user input. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `required Type Type` - `"end_turn"EndTurn` - `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. - `required IReadOnlyList EventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `required Type Type` - `"requires_action"RequiresAction` - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"retries_exhausted"RetriesExhausted` - `required Type Type` - `"session.status_idle"SessionStatusIdle` - `class BetaManagedAgentsSessionStatusTerminatedEvent:` Indicates the session has terminated, either due to an error or completion. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_terminated"SessionStatusTerminated` - `class BetaManagedAgentsSessionThreadCreatedEvent:` Emitted when a subagent is spawned as a new thread. Written to the parent thread's output stream so clients observing the session see child creation. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the callable agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public `sthr_` ID of the newly created thread. - `required Type Type` - `"session.thread_created"SessionThreadCreated` - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent:` Emitted when an outcome evaluation cycle begins. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_start"SpanOutcomeEvaluationStart` - `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. - `required string ID` Unique identifier for this event. - `required string Explanation` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeEvaluationStartID` The id of the corresponding `span.outcome_evaluation_start` event. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string Result` 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. - `required Type Type` - `"span.outcome_evaluation_end"SpanOutcomeEvaluationEnd` - `required BetaManagedAgentsSpanModelUsage Usage` Token usage for a single model request. - `required Int CacheCreationInputTokens` Tokens used to create prompt cache in this request. - `required Int CacheReadInputTokens` Tokens read from prompt cache in this request. - `required Int InputTokens` Input tokens consumed by this request. - `required Int OutputTokens` Output tokens generated by this request. - `Speed? Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `class BetaManagedAgentsSpanModelRequestStartEvent:` Emitted when a model request is initiated by the agent. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_start"SpanModelRequestStart` - `class BetaManagedAgentsSpanModelRequestEndEvent:` Emitted when a model request completes. - `required string ID` Unique identifier for this event. - `required Boolean? IsError` Whether the model request resulted in an error. - `required string ModelRequestStartID` The id of the corresponding `span.model_request_start` event. - `required BetaManagedAgentsSpanModelUsage ModelUsage` Token usage for a single model request. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_end"SpanModelRequestEnd` - `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. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_ongoing"SpanOutcomeEvaluationOngoing` - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `required string ID` Unique identifier for this event. - `required string Description` What the agent should produce. Copied from the input event. - `required Int? MaxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `required string OutcomeID` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `class BetaManagedAgentsSessionDeletedEvent:` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.deleted"SessionDeleted` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that started running. - `required Type Type` - `"session.thread_status_running"SessionThreadStatusRunning` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that went idle. - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `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 the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"session.thread_status_idle"SessionThreadStatusIdle` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that terminated. - `required Type Type` - `"session.thread_status_terminated"SessionThreadStatusTerminated` - `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. - `required string ID` Unique identifier for this event. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that is retrying. - `required Type Type` - `"session.thread_status_rescheduled"SessionThreadStatusRescheduled` - `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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.updated"SessionUpdated` - `BetaManagedAgentsSessionAgent? Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `IReadOnlyDictionary Metadata` 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. - `string? Title` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` System content blocks. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? NextPage` Opaque cursor for the next page. Null when no more results. ### Example ```csharp EventListParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7", ThreadID = "sthr_011CZkZVWa6oIjw0rgXZpnBt", }; var page = await client.Beta.Sessions.Threads.Events.List(parameters); await foreach (var item in page.Paginate()) { Console.WriteLine(item); } ``` #### Response ```json { "data": [ { "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ], "next_page": "next_page" } ``` ## Stream Session Thread Events `BetaManagedAgentsStreamSessionThreadEvents Beta.Sessions.Threads.Events.StreamStreaming(EventStreamParamsparameters, CancellationTokencancellationToken = default)` **get** `/v1/sessions/{session_id}/threads/{thread_id}/stream` Stream Session Thread Events ### Parameters - `EventStreamParams parameters` - `required string sessionID` Path param: Path parameter session_id - `required string threadID` Path param: Path parameter thread_id - `IReadOnlyList betas` Header param: Optional header to specify the beta version(s) you want to use. - `"message-batches-2024-09-24"MessageBatches2024_09_24` - `"prompt-caching-2024-07-31"PromptCaching2024_07_31` - `"computer-use-2024-10-22"ComputerUse2024_10_22` - `"computer-use-2025-01-24"ComputerUse2025_01_24` - `"pdfs-2024-09-25"Pdfs2024_09_25` - `"token-counting-2024-11-01"TokenCounting2024_11_01` - `"token-efficient-tools-2025-02-19"TokenEfficientTools2025_02_19` - `"output-128k-2025-02-19"Output128k2025_02_19` - `"files-api-2025-04-14"FilesApi2025_04_14` - `"mcp-client-2025-04-04"McpClient2025_04_04` - `"mcp-client-2025-11-20"McpClient2025_11_20` - `"dev-full-thinking-2025-05-14"DevFullThinking2025_05_14` - `"interleaved-thinking-2025-05-14"InterleavedThinking2025_05_14` - `"code-execution-2025-05-22"CodeExecution2025_05_22` - `"extended-cache-ttl-2025-04-11"ExtendedCacheTtl2025_04_11` - `"context-1m-2025-08-07"Context1m2025_08_07` - `"context-management-2025-06-27"ContextManagement2025_06_27` - `"model-context-window-exceeded-2025-08-26"ModelContextWindowExceeded2025_08_26` - `"skills-2025-10-02"Skills2025_10_02` - `"fast-mode-2026-02-01"FastMode2026_02_01` - `"output-300k-2026-03-24"Output300k2026_03_24` - `"user-profiles-2026-03-24"UserProfiles2026_03_24` - `"advisor-tool-2026-03-01"AdvisorTool2026_03_01` - `"managed-agents-2026-04-01"ManagedAgents2026_04_01` - `"cache-diagnosis-2026-04-07"CacheDiagnosis2026_04_07` - `"thinking-token-count-2026-05-13"ThinkingTokenCount2026_05_13` - `"server-side-fallback-2026-06-01"ServerSideFallback2026_06_01` - `"fallback-credit-2026-06-01"FallbackCredit2026_06_01` ### Returns - `class BetaManagedAgentsStreamSessionThreadEvents: A class that can be one of several variants.union` Server-sent event in a single thread's stream. - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `required Source Source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `required string Data` Base64-encoded image data. - `required string MediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"image"Image` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `required Source Source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `required string Data` Base64-encoded document data. - `required string MediaType` MIME type of the document (e.g., "application/pdf"). - `required Type Type` - `"base64"Base64` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `required string Data` The plain text content. - `required MediaType MediaType` MIME type of the text content. Must be "text/plain". - `"text/plain"TextPlain` - `required Type Type` - `"text"Text` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `required Type Type` - `"url"Url` - `required string Url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `required string FileID` ID of a previously uploaded file. - `required Type Type` - `"file"File` - `required Type Type` - `"document"Document` - `string? Context` Additional context about the document for the model. - `string? Title` The title of the document. - `required Type Type` - `"user.message"UserMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `required string ID` Unique identifier for this event. - `required Type Type` - `"user.interrupt"UserInterrupt` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` 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. - `required string ID` Unique identifier for this event. - `required Result Result` UserToolConfirmationResult enum - `"allow"Allow` - `"deny"Deny` - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_confirmation"UserToolConfirmation` - `string? DenyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `required string ID` Unique identifier for this event. - `required string CustomToolUseID` The id of the `agent.custom_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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.custom_tool_result"UserCustomToolResult` - `IReadOnlyList 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. - `required BetaManagedAgentsSearchResultCitations Citations` Citation settings for a search result. - `required Boolean Enabled` Whether citations are enabled for this search result. - `required IReadOnlyList Content` Array of text content blocks from the search result. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required string Source` The URL source of the search result. - `required string Title` The title of the search result. - `required Type Type` - `"search_result"SearchResult` - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the custom tool being called. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.custom_tool_use"AgentCustomToolUse` - `string? SessionThreadID` 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. Echo this on a `user.custom_tool_result` event to route the result back. - `class BetaManagedAgentsAgentMessageEvent:` An agent response event in the session conversation. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` Array of text blocks comprising the agent response. - `required string Text` The text content. - `required Type Type` - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.message"AgentMessage` - `class BetaManagedAgentsAgentThinkingEvent:` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thinking"AgentThinking` - `class BetaManagedAgentsAgentMcpToolUseEvent:` Event emitted when the agent invokes a tool provided by an MCP server. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string McpServerName` Name of the MCP server providing the tool. - `required string Name` Name of the MCP tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_use"AgentMcpToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentMcpToolResultEvent:` Event representing the result of an MCP tool execution. - `required string ID` Unique identifier for this event. - `required string McpToolUseID` The id of the `agent.mcp_tool_use` event this result corresponds to. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.mcp_tool_result"AgentMcpToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent:` Event emitted when the agent invokes a built-in agent tool. - `required string ID` Unique identifier for this event. - `required IReadOnlyDictionary Input` Input parameters for the tool call. - `required string Name` Name of the agent tool being used. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.tool_use"AgentToolUse` - `EvaluatedPermission EvaluatedPermission` AgentEvaluatedPermission enum - `"allow"Allow` - `"ask"Ask` - `"deny"Deny` - `string? SessionThreadID` 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. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentToolResultEvent:` Event representing the result of an agent tool execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToolUseID` The id of the `agent.tool_use` event this result corresponds to. - `required Type Type` - `"agent.tool_result"AgentToolResult` - `IReadOnlyList 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. - `Boolean? IsError` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required string FromSessionThreadID` Public `sthr_` ID of the thread that sent the message. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_message_received"AgentThreadMessageReceived` - `string? FromAgentName` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList 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. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string ToSessionThreadID` Public `sthr_` ID of the thread the message was sent to. - `required Type Type` - `"agent.thread_message_sent"AgentThreadMessageSent` - `string? ToAgentName` 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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"agent.thread_context_compacted"AgentThreadContextCompacted` - `class BetaManagedAgentsSessionErrorEvent:` An error event indicating a problem occurred during session execution. - `required string ID` Unique identifier for this event. - `required Error Error` 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. - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"retrying"Retrying` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `required Type Type` - `"exhausted"Exhausted` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `required Type Type` - `"terminal"Terminal` - `required Type Type` - `"unknown_error"UnknownError` - `class BetaManagedAgentsModelOverloadedError:` The model is currently overloaded. Emitted after automatic retries are exhausted. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_overloaded_error"ModelOverloadedError` - `class BetaManagedAgentsModelRateLimitedError:` The model request was rate-limited. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_rate_limited_error"ModelRateLimitedError` - `class BetaManagedAgentsModelRequestFailedError:` A model request failed for a reason other than overload or rate-limiting. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"model_request_failed_error"ModelRequestFailedError` - `class BetaManagedAgentsMcpConnectionFailedError:` Failed to connect to an MCP server. - `required string McpServerName` Name of the MCP server that failed to connect. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_connection_failed_error"McpConnectionFailedError` - `class BetaManagedAgentsMcpAuthenticationFailedError:` Authentication to an MCP server failed. - `required string McpServerName` Name of the MCP server that failed authentication. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"mcp_authentication_failed_error"McpAuthenticationFailedError` - `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. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"billing_error"BillingError` - `class BetaManagedAgentsCredentialHostUnreachableError:` An `environment_variable` credential's `auth.networking.allowed_hosts` includes a host the environment's network policy does not permit. - `required string CredentialID` ID of the affected credential. - `required string Message` Human-readable error description. - `required RetryStatus RetryStatus` What the client should do next in response to this error. - `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. - `required Type Type` - `"credential_host_unreachable_error"CredentialHostUnreachableError` - `required string VaultID` ID of the vault containing the affected credential. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.error"SessionError` - `class BetaManagedAgentsSessionStatusRescheduledEvent:` Indicates the session is recovering from an error state and is rescheduled for execution. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_rescheduled"SessionStatusRescheduled` - `class BetaManagedAgentsSessionStatusRunningEvent:` Indicates the session is actively running and the agent is working. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_running"SessionStatusRunning` - `class BetaManagedAgentsSessionStatusIdleEvent:` Indicates the agent has paused and is awaiting user input. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `required Type Type` - `"end_turn"EndTurn` - `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. - `required IReadOnlyList EventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `required Type Type` - `"requires_action"RequiresAction` - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"retries_exhausted"RetriesExhausted` - `required Type Type` - `"session.status_idle"SessionStatusIdle` - `class BetaManagedAgentsSessionStatusTerminatedEvent:` Indicates the session has terminated, either due to an error or completion. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.status_terminated"SessionStatusTerminated` - `class BetaManagedAgentsSessionThreadCreatedEvent:` Emitted when a subagent is spawned as a new thread. Written to the parent thread's output stream so clients observing the session see child creation. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the callable agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public `sthr_` ID of the newly created thread. - `required Type Type` - `"session.thread_created"SessionThreadCreated` - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent:` Emitted when an outcome evaluation cycle begins. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_start"SpanOutcomeEvaluationStart` - `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. - `required string ID` Unique identifier for this event. - `required string Explanation` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeEvaluationStartID` The id of the corresponding `span.outcome_evaluation_start` event. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string Result` 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. - `required Type Type` - `"span.outcome_evaluation_end"SpanOutcomeEvaluationEnd` - `required BetaManagedAgentsSpanModelUsage Usage` Token usage for a single model request. - `required Int CacheCreationInputTokens` Tokens used to create prompt cache in this request. - `required Int CacheReadInputTokens` Tokens read from prompt cache in this request. - `required Int InputTokens` Input tokens consumed by this request. - `required Int OutputTokens` Output tokens generated by this request. - `Speed? Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `class BetaManagedAgentsSpanModelRequestStartEvent:` Emitted when a model request is initiated by the agent. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_start"SpanModelRequestStart` - `class BetaManagedAgentsSpanModelRequestEndEvent:` Emitted when a model request completes. - `required string ID` Unique identifier for this event. - `required Boolean? IsError` Whether the model request resulted in an error. - `required string ModelRequestStartID` The id of the corresponding `span.model_request_start` event. - `required BetaManagedAgentsSpanModelUsage ModelUsage` Token usage for a single model request. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.model_request_end"SpanModelRequestEnd` - `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. - `required string ID` Unique identifier for this event. - `required Int Iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `required string OutcomeID` The `outc_` ID of the outcome being evaluated. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"span.outcome_evaluation_ongoing"SpanOutcomeEvaluationOngoing` - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `required string ID` Unique identifier for this event. - `required string Description` What the agent should produce. Copied from the input event. - `required Int? MaxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `required string OutcomeID` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Rubric Rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `required string FileID` ID of the rubric file. - `required Type Type` - `"file"File` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `required string Content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `required Type Type` - `"text"Text` - `required Type Type` - `"user.define_outcome"UserDefineOutcome` - `class BetaManagedAgentsSessionDeletedEvent:` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.deleted"SessionDeleted` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that started running. - `required Type Type` - `"session.thread_status_running"SessionThreadStatusRunning` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that went idle. - `required StopReason StopReason` The agent completed its turn naturally and is ready for the next user message. - `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 the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `required Type Type` - `"session.thread_status_idle"SessionThreadStatusIdle` - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that terminated. - `required Type Type` - `"session.thread_status_terminated"SessionThreadStatusTerminated` - `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. - `required string ID` Unique identifier for this event. - `required string ToolUseID` 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#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `required Type Type` - `"user.tool_result"UserToolResult` - `IReadOnlyList 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. - `Boolean? IsError` Whether the tool execution resulted in an error. - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format - `string? SessionThreadID` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `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. - `required string ID` Unique identifier for this event. - `required string AgentName` Name of the agent the thread runs. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required string SessionThreadID` Public sthr_ ID of the thread that is retrying. - `required Type Type` - `"session.thread_status_rescheduled"SessionThreadStatusRescheduled` - `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. - `required string ID` Unique identifier for this event. - `required DateTimeOffset ProcessedAt` A timestamp in RFC 3339 format - `required Type Type` - `"session.updated"SessionUpdated` - `BetaManagedAgentsSessionAgent? Agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `"url"Url` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required BetaManagedAgentsModel ID` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `"claude-fable-5"ClaudeFable5` Next generation of intelligence for the hardest knowledge work and coding problems - `"claude-opus-4-8"ClaudeOpus4_8` Frontier intelligence for long-running agents and coding - `"claude-opus-4-7"ClaudeOpus4_7` Frontier intelligence for long-running agents and coding - `"claude-opus-4-6"ClaudeOpus4_6` Most intelligent model for building agents and coding - `"claude-sonnet-4-6"ClaudeSonnet4_6` Best combination of speed and intelligence - `"claude-haiku-4-5"ClaudeHaiku4_5` Fastest model with near-frontier intelligence - `"claude-haiku-4-5-20251001"ClaudeHaiku4_5_20251001` Fastest model with near-frontier intelligence - `"claude-opus-4-5"ClaudeOpus4_5` Premium model combining maximum intelligence with practical performance - `"claude-opus-4-5-20251101"ClaudeOpus4_5_20251101` Premium model combining maximum intelligence with practical performance - `"claude-sonnet-4-5"ClaudeSonnet4_5` High-performance model for agents and coding - `"claude-sonnet-4-5-20250929"ClaudeSonnet4_5_20250929` High-performance model for agents and coding - `Speed Speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `"standard"Standard` - `"fast"Fast` - `required BetaManagedAgentsSessionMultiagentCoordinator? Multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `required IReadOnlyList Agents` Full `agent` definitions the coordinator may spawn as session threads. - `required string ID` - `required string? Description` - `required IReadOnlyList McpServers` - `required string Name` - `required Type Type` - `required string Url` - `required BetaManagedAgentsModelConfig Model` Model identifier and configuration. - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `required string SkillID` - `required Type Type` - `"anthropic"Anthropic` - `required string Version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string SkillID` - `required Type Type` - `"custom"Custom` - `required string Version` - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required Name Name` Built-in agent tool identifier. - `"bash"Bash` - `"edit"Edit` - `"read"Read` - `"write"Write` - `"glob"Glob` - `"grep"Grep` - `"web_fetch"WebFetch` - `"web_search"WebSearch` - `required PermissionPolicy PermissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `required Type Type` - `"always_allow"AlwaysAllow` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `required Type Type` - `"always_ask"AlwaysAsk` - `required BetaManagedAgentsAgentToolsetDefaultConfig DefaultConfig` Resolved default configuration for agent tools. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required Type Type` - `"agent_toolset_20260401"AgentToolset20260401` - `class BetaManagedAgentsMcpToolset:` - `required IReadOnlyList Configs` - `required Boolean Enabled` - `required string Name` - `required PermissionPolicy 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. - `required BetaManagedAgentsMcpToolsetDefaultConfig DefaultConfig` Resolved default configuration for all tools from an MCP server. - `required Boolean Enabled` - `required PermissionPolicy 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. - `required string McpServerName` - `required Type Type` - `"mcp_toolset"McpToolset` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required string Description` - `required BetaManagedAgentsCustomToolInputSchema InputSchema` JSON Schema for custom tool input parameters. - `JsonElement Type "object"constant` - `IReadOnlyDictionary? Properties` - `IReadOnlyList? Required` - `required string Name` - `required Type Type` - `"custom"Custom` - `required Type Type` - `"agent"Agent` - `required Int Version` - `required Type Type` - `"coordinator"Coordinator` - `required string Name` - `required IReadOnlyList Skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `required string? System` - `required IReadOnlyList Tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `required Type Type` - `"agent"Agent` - `required Int Version` - `IReadOnlyDictionary Metadata` 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. - `string? Title` 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. - `required string ID` Unique identifier for this event. - `required IReadOnlyList Content` System content blocks. Text-only. - `required string Text` The text content. - `required Type Type` - `"text"Text` - `required Type Type` - `"system.message"SystemMessage` - `DateTimeOffset? ProcessedAt` A timestamp in RFC 3339 format ### Example ```csharp EventStreamParams parameters = new() { SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7", ThreadID = "sthr_011CZkZVWa6oIjw0rgXZpnBt", }; await foreach (var betaManagedAgentsStreamSessionThreadEvents in client.Beta.Sessions.Threads.Events.StreamStreaming(parameters)) { Console.WriteLine(betaManagedAgentsStreamSessionThreadEvents); } ``` #### Response ```json { "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ```