# Events ## List Session Thread Events `beta.sessions.threads.events.list(thread_id, **kwargs) -> PageCursor` **get** `/v1/sessions/{session_id}/threads/{thread_id}/events` List Session Thread Events ### Parameters - `session_id: String` - `thread_id: String` - `limit: Integer` Query parameter for limit - `page: String` Query parameter for page - `betas: Array[AnthropicBeta]` Optional header to specify the beta version(s) you want to use. - `String = String` - `AnthropicBeta = :"message-batches-2024-09-24" | :"prompt-caching-2024-07-31" | :"computer-use-2024-10-22" | 23 more` - `:"message-batches-2024-09-24"` - `:"prompt-caching-2024-07-31"` - `:"computer-use-2024-10-22"` - `:"computer-use-2025-01-24"` - `:"pdfs-2024-09-25"` - `:"token-counting-2024-11-01"` - `:"token-efficient-tools-2025-02-19"` - `:"output-128k-2025-02-19"` - `:"files-api-2025-04-14"` - `:"mcp-client-2025-04-04"` - `:"mcp-client-2025-11-20"` - `:"dev-full-thinking-2025-05-14"` - `:"interleaved-thinking-2025-05-14"` - `:"code-execution-2025-05-22"` - `:"extended-cache-ttl-2025-04-11"` - `:"context-1m-2025-08-07"` - `:"context-management-2025-06-27"` - `:"model-context-window-exceeded-2025-08-26"` - `:"skills-2025-10-02"` - `:"fast-mode-2026-02-01"` - `:"output-300k-2026-03-24"` - `:"user-profiles-2026-03-24"` - `:"advisor-tool-2026-03-01"` - `:"managed-agents-2026-04-01"` - `:"cache-diagnosis-2026-04-07"` - `:"thinking-token-count-2026-05-13"` ### Returns - `BetaManagedAgentsSessionEvent = BetaManagedAgentsUserMessageEvent | BetaManagedAgentsUserInterruptEvent | BetaManagedAgentsUserToolConfirmationEvent | 30 more` Union type for all event types in a session. - `class BetaManagedAgentsUserMessageEvent` A user message event in the session conversation. - `id: String` Unique identifier for this event. - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock]` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock` Regular text content. - `text: String` The text content. - `type: :text` - `:text` - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `source: BetaManagedAgentsBase64ImageSource | BetaManagedAgentsURLImageSource | BetaManagedAgentsFileImageSource` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `data: String` Base64-encoded image data. - `media_type: String` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `type: :base64` - `:base64` - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: :url` - `:url` - `url: String` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `file_id: String` ID of a previously uploaded file. - `type: :file` - `:file` - `type: :image` - `:image` - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `source: BetaManagedAgentsBase64DocumentSource | BetaManagedAgentsPlainTextDocumentSource | BetaManagedAgentsURLDocumentSource | BetaManagedAgentsFileDocumentSource` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `data: String` Base64-encoded document data. - `media_type: String` MIME type of the document (e.g., "application/pdf"). - `type: :base64` - `:base64` - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `data: String` The plain text content. - `media_type: :"text/plain"` MIME type of the text content. Must be "text/plain". - `:"text/plain"` - `type: :text` - `:text` - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: :url` - `:url` - `url: String` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `file_id: String` ID of a previously uploaded file. - `type: :file` - `:file` - `type: :document` - `:document` - `context: String` Additional context about the document for the model. - `title: String` The title of the document. - `type: :"user.message"` - `:"user.message"` - `processed_at: Time` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent` An interrupt event that pauses agent execution and returns control to the user. - `id: String` Unique identifier for this event. - `type: :"user.interrupt"` - `:"user.interrupt"` - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `result: :allow | :deny` UserToolConfirmationResult enum - `:allow` - `:deny` - `tool_use_id: String` 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. - `type: :"user.tool_confirmation"` - `:"user.tool_confirmation"` - `deny_message: String` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `custom_tool_use_id: String` 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. - `type: :"user.custom_tool_result"` - `:"user.custom_tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` 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. - `citations: BetaManagedAgentsSearchResultCitations` Citation settings for a search result. - `enabled: bool` Whether citations are enabled for this search result. - `content: Array[BetaManagedAgentsSearchResultContent]` Array of text content blocks from the search result. - `text: String` The text content. - `type: :text` - `:text` - `source: String` The URL source of the search result. - `title: String` The title of the search result. - `type: :search_result` - `:search_result` - `is_error: bool` Whether the tool execution resulted in an error. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `input: Hash[Symbol, untyped]` Input parameters for the tool call. - `name: String` Name of the custom tool being called. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.custom_tool_use"` - `:"agent.custom_tool_use"` - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `content: Array[BetaManagedAgentsTextBlock]` Array of text blocks comprising the agent response. - `text: String` The text content. - `type: :text` - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.message"` - `:"agent.message"` - `class BetaManagedAgentsAgentThinkingEvent` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.thinking"` - `:"agent.thinking"` - `class BetaManagedAgentsAgentMCPToolUseEvent` Event emitted when the agent invokes a tool provided by an MCP server. - `id: String` Unique identifier for this event. - `input: Hash[Symbol, untyped]` Input parameters for the tool call. - `mcp_server_name: String` Name of the MCP server providing the tool. - `name: String` Name of the MCP tool being used. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.mcp_tool_use"` - `:"agent.mcp_tool_use"` - `evaluated_permission: :allow | :ask | :deny` AgentEvaluatedPermission enum - `:allow` - `:ask` - `:deny` - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `mcp_tool_use_id: String` The id of the `agent.mcp_tool_use` event this result corresponds to. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.mcp_tool_result"` - `:"agent.mcp_tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: bool` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent` Event emitted when the agent invokes a built-in agent tool. - `id: String` Unique identifier for this event. - `input: Hash[Symbol, untyped]` Input parameters for the tool call. - `name: String` Name of the agent tool being used. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.tool_use"` - `:"agent.tool_use"` - `evaluated_permission: :allow | :ask | :deny` AgentEvaluatedPermission enum - `:allow` - `:ask` - `:deny` - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `tool_use_id: String` The id of the `agent.tool_use` event this result corresponds to. - `type: :"agent.tool_result"` - `:"agent.tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: bool` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentThreadMessageReceivedEvent` Delivery event written to the target thread's input stream when an agent-to-agent message arrives. - `id: String` Unique identifier for this event. - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock]` 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. - `from_session_thread_id: String` Public `sthr_` ID of the thread that sent the message. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.thread_message_received"` - `:"agent.thread_message_received"` - `from_agent_name: String` 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. - `id: String` Unique identifier for this event. - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock]` 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. - `processed_at: Time` A timestamp in RFC 3339 format - `to_session_thread_id: String` Public `sthr_` ID of the thread the message was sent to. - `type: :"agent.thread_message_sent"` - `:"agent.thread_message_sent"` - `to_agent_name: String` 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. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.thread_context_compacted"` - `:"agent.thread_context_compacted"` - `class BetaManagedAgentsSessionErrorEvent` An error event indicating a problem occurred during session execution. - `id: String` Unique identifier for this event. - `error: BetaManagedAgentsUnknownError | BetaManagedAgentsModelOverloadedError | BetaManagedAgentsModelRateLimitedError | 4 more` 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. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `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. - `type: :exhausted` - `:exhausted` - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `type: :terminal` - `:terminal` - `type: :unknown_error` - `:unknown_error` - `class BetaManagedAgentsModelOverloadedError` The model is currently overloaded. Emitted after automatic retries are exhausted. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :model_overloaded_error` - `:model_overloaded_error` - `class BetaManagedAgentsModelRateLimitedError` The model request was rate-limited. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :model_rate_limited_error` - `:model_rate_limited_error` - `class BetaManagedAgentsModelRequestFailedError` A model request failed for a reason other than overload or rate-limiting. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :model_request_failed_error` - `:model_request_failed_error` - `class BetaManagedAgentsMCPConnectionFailedError` Failed to connect to an MCP server. - `mcp_server_name: String` Name of the MCP server that failed to connect. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :mcp_connection_failed_error` - `:mcp_connection_failed_error` - `class BetaManagedAgentsMCPAuthenticationFailedError` Authentication to an MCP server failed. - `mcp_server_name: String` Name of the MCP server that failed authentication. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :mcp_authentication_failed_error` - `:mcp_authentication_failed_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. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :billing_error` - `:billing_error` - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.error"` - `:"session.error"` - `class BetaManagedAgentsSessionStatusRescheduledEvent` Indicates the session is recovering from an error state and is rescheduled for execution. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.status_rescheduled"` - `:"session.status_rescheduled"` - `class BetaManagedAgentsSessionStatusRunningEvent` Indicates the session is actively running and the agent is working. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.status_running"` - `:"session.status_running"` - `class BetaManagedAgentsSessionStatusIdleEvent` Indicates the agent has paused and is awaiting user input. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `stop_reason: BetaManagedAgentsSessionEndTurn | BetaManagedAgentsSessionRequiresAction | BetaManagedAgentsSessionRetriesExhausted` 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. - `type: :end_turn` - `:end_turn` - `class BetaManagedAgentsSessionRequiresAction` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `event_ids: Array[String]` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `type: :requires_action` - `:requires_action` - `class BetaManagedAgentsSessionRetriesExhausted` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `type: :retries_exhausted` - `:retries_exhausted` - `type: :"session.status_idle"` - `:"session.status_idle"` - `class BetaManagedAgentsSessionStatusTerminatedEvent` Indicates the session has terminated, either due to an error or completion. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.status_terminated"` - `:"session.status_terminated"` - `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. - `id: String` Unique identifier for this event. - `agent_name: String` Name of the callable agent the thread runs. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Public `sthr_` ID of the newly created thread. - `type: :"session.thread_created"` - `:"session.thread_created"` - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent` Emitted when an outcome evaluation cycle begins. - `id: String` Unique identifier for this event. - `iteration: Integer` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `outcome_id: String` The `outc_` ID of the outcome being evaluated. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"span.outcome_evaluation_start"` - `:"span.outcome_evaluation_start"` - `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. - `id: String` Unique identifier for this event. - `explanation: String` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `iteration: Integer` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `outcome_evaluation_start_id: String` The id of the corresponding `span.outcome_evaluation_start` event. - `outcome_id: String` The `outc_` ID of the outcome being evaluated. - `processed_at: Time` A timestamp in RFC 3339 format - `result: String` 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. - `type: :"span.outcome_evaluation_end"` - `:"span.outcome_evaluation_end"` - `usage: BetaManagedAgentsSpanModelUsage` Token usage for a single model request. - `cache_creation_input_tokens: Integer` Tokens used to create prompt cache in this request. - `cache_read_input_tokens: Integer` Tokens read from prompt cache in this request. - `input_tokens: Integer` Input tokens consumed by this request. - `output_tokens: Integer` Output tokens generated by this request. - `speed: :standard | :fast` 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` - `:fast` - `class BetaManagedAgentsSpanModelRequestStartEvent` Emitted when a model request is initiated by the agent. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"span.model_request_start"` - `:"span.model_request_start"` - `class BetaManagedAgentsSpanModelRequestEndEvent` Emitted when a model request completes. - `id: String` Unique identifier for this event. - `is_error: bool` Whether the model request resulted in an error. - `model_request_start_id: String` The id of the corresponding `span.model_request_start` event. - `model_usage: BetaManagedAgentsSpanModelUsage` Token usage for a single model request. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"span.model_request_end"` - `:"span.model_request_end"` - `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. - `id: String` Unique identifier for this event. - `iteration: Integer` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `outcome_id: String` The `outc_` ID of the outcome being evaluated. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"span.outcome_evaluation_ongoing"` - `:"span.outcome_evaluation_ongoing"` - `class BetaManagedAgentsUserDefineOutcomeEvent` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `id: String` Unique identifier for this event. - `description: String` What the agent should produce. Copied from the input event. - `max_iterations: Integer` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `outcome_id: String` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `processed_at: Time` A timestamp in RFC 3339 format - `rubric: BetaManagedAgentsFileRubric | BetaManagedAgentsTextRubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric` Rubric referenced by a file uploaded via the Files API. - `file_id: String` ID of the rubric file. - `type: :file` - `:file` - `class BetaManagedAgentsTextRubric` Rubric content provided inline as text. - `content: String` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `type: :text` - `:text` - `type: :"user.define_outcome"` - `:"user.define_outcome"` - `class BetaManagedAgentsSessionDeletedEvent` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.deleted"` - `:"session.deleted"` - `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. - `id: String` Unique identifier for this event. - `agent_name: String` Name of the agent the thread runs. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Public sthr_ ID of the thread that started running. - `type: :"session.thread_status_running"` - `:"session.thread_status_running"` - `class BetaManagedAgentsSessionThreadStatusIdleEvent` A session thread has yielded and is awaiting input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `id: String` Unique identifier for this event. - `agent_name: String` Name of the agent the thread runs. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Public sthr_ ID of the thread that went idle. - `stop_reason: BetaManagedAgentsSessionEndTurn | BetaManagedAgentsSessionRequiresAction | BetaManagedAgentsSessionRetriesExhausted` 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'`). - `type: :"session.thread_status_idle"` - `:"session.thread_status_idle"` - `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. - `id: String` Unique identifier for this event. - `agent_name: String` Name of the agent the thread runs. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Public sthr_ ID of the thread that terminated. - `type: :"session.thread_status_terminated"` - `:"session.thread_status_terminated"` - `class BetaManagedAgentsUserToolResultEvent` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `id: String` Unique identifier for this event. - `tool_use_id: String` 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. - `type: :"user.tool_result"` - `:"user.tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: bool` Whether the tool execution resulted in an error. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `agent_name: String` Name of the agent the thread runs. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Public sthr_ ID of the thread that is retrying. - `type: :"session.thread_status_rescheduled"` - `:"session.thread_status_rescheduled"` - `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. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.updated"` - `:"session.updated"` - `agent: BetaManagedAgentsSessionAgent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `id: String` - `description: String` - `mcp_servers: Array[BetaManagedAgentsMCPServerURLDefinition]` - `name: String` - `type: :url` - `:url` - `url: String` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `BetaManagedAgentsModel = :"claude-opus-4-8" | :"claude-opus-4-7" | :"claude-opus-4-6" | 7 more` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `:"claude-opus-4-8"` Frontier intelligence for long-running agents and coding - `:"claude-opus-4-7"` Frontier intelligence for long-running agents and coding - `:"claude-opus-4-6"` Most intelligent model for building agents and coding - `:"claude-sonnet-4-6"` Best combination of speed and intelligence - `:"claude-haiku-4-5"` Fastest model with near-frontier intelligence - `:"claude-haiku-4-5-20251001"` Fastest model with near-frontier intelligence - `:"claude-opus-4-5"` Premium model combining maximum intelligence with practical performance - `:"claude-opus-4-5-20251101"` Premium model combining maximum intelligence with practical performance - `:"claude-sonnet-4-5"` High-performance model for agents and coding - `:"claude-sonnet-4-5-20250929"` High-performance model for agents and coding - `String = String` - `speed: :standard | :fast` 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` - `:fast` - `multiagent: BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `agents: Array[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions the coordinator may spawn as session threads. - `id: String` - `description: String` - `mcp_servers: Array[BetaManagedAgentsMCPServerURLDefinition]` - `name: String` - `type: :url` - `url: String` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: String` - `skills: Array[BetaManagedAgentsAnthropicSkill | BetaManagedAgentsCustomSkill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `skill_id: String` - `type: :anthropic` - `:anthropic` - `version: String` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `skill_id: String` - `type: :custom` - `:custom` - `version: String` - `system_: String` - `tools: Array[BetaManagedAgentsAgentToolset20260401 | BetaManagedAgentsMCPToolset | BetaManagedAgentsCustomTool]` - `class BetaManagedAgentsAgentToolset20260401` - `configs: Array[BetaManagedAgentsAgentToolConfig]` - `enabled: bool` - `name: :bash | :edit | :read | 5 more` Built-in agent tool identifier. - `:bash` - `:edit` - `:read` - `:write` - `:glob` - `:grep` - `:web_fetch` - `:web_search` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: :always_allow` - `:always_allow` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: :always_ask` - `:always_ask` - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: :agent_toolset_20260401` - `:agent_toolset_20260401` - `class BetaManagedAgentsMCPToolset` - `configs: Array[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: String` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `mcp_server_name: String` - `type: :mcp_toolset` - `:mcp_toolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `description: String` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `properties: Hash[Symbol, untyped]` JSON Schema properties defining the tool's input parameters. - `required: Array[String]` List of required property names. - `type: :object` Must be 'object' for tool input schemas. - `:object` - `name: String` - `type: :custom` - `:custom` - `type: :agent` - `:agent` - `version: Integer` - `type: :coordinator` - `:coordinator` - `name: String` - `skills: Array[BetaManagedAgentsAnthropicSkill | BetaManagedAgentsCustomSkill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system_: String` - `tools: Array[BetaManagedAgentsAgentToolset20260401 | BetaManagedAgentsMCPToolset | BetaManagedAgentsCustomTool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: :agent` - `:agent` - `version: Integer` - `metadata: Hash[Symbol, String]` The session's full metadata bag after the update. Present when the update set non-empty metadata; absent when metadata was unchanged or cleared to empty. - `title: String` The session's new title. Present only when the update changed it. ### Example ```ruby require "anthropic" anthropic = Anthropic::Client.new(api_key: "my-anthropic-api-key") page = anthropic.beta.sessions.threads.events.list( "sthr_011CZkZVWa6oIjw0rgXZpnBt", session_id: "sesn_011CZkZAtmR3yMPDzynEDxu7" ) puts(page) ``` #### 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 `beta.sessions.threads.events.stream(thread_id, **kwargs) -> BetaManagedAgentsStreamSessionThreadEvents` **get** `/v1/sessions/{session_id}/threads/{thread_id}/stream` Stream Session Thread Events ### Parameters - `session_id: String` - `thread_id: String` - `betas: Array[AnthropicBeta]` Optional header to specify the beta version(s) you want to use. - `String = String` - `AnthropicBeta = :"message-batches-2024-09-24" | :"prompt-caching-2024-07-31" | :"computer-use-2024-10-22" | 23 more` - `:"message-batches-2024-09-24"` - `:"prompt-caching-2024-07-31"` - `:"computer-use-2024-10-22"` - `:"computer-use-2025-01-24"` - `:"pdfs-2024-09-25"` - `:"token-counting-2024-11-01"` - `:"token-efficient-tools-2025-02-19"` - `:"output-128k-2025-02-19"` - `:"files-api-2025-04-14"` - `:"mcp-client-2025-04-04"` - `:"mcp-client-2025-11-20"` - `:"dev-full-thinking-2025-05-14"` - `:"interleaved-thinking-2025-05-14"` - `:"code-execution-2025-05-22"` - `:"extended-cache-ttl-2025-04-11"` - `:"context-1m-2025-08-07"` - `:"context-management-2025-06-27"` - `:"model-context-window-exceeded-2025-08-26"` - `:"skills-2025-10-02"` - `:"fast-mode-2026-02-01"` - `:"output-300k-2026-03-24"` - `:"user-profiles-2026-03-24"` - `:"advisor-tool-2026-03-01"` - `:"managed-agents-2026-04-01"` - `:"cache-diagnosis-2026-04-07"` - `:"thinking-token-count-2026-05-13"` ### Returns - `BetaManagedAgentsStreamSessionThreadEvents = BetaManagedAgentsUserMessageEvent | BetaManagedAgentsUserInterruptEvent | BetaManagedAgentsUserToolConfirmationEvent | 30 more` Server-sent event in a single thread's stream. - `class BetaManagedAgentsUserMessageEvent` A user message event in the session conversation. - `id: String` Unique identifier for this event. - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock]` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock` Regular text content. - `text: String` The text content. - `type: :text` - `:text` - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `source: BetaManagedAgentsBase64ImageSource | BetaManagedAgentsURLImageSource | BetaManagedAgentsFileImageSource` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `data: String` Base64-encoded image data. - `media_type: String` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `type: :base64` - `:base64` - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: :url` - `:url` - `url: String` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `file_id: String` ID of a previously uploaded file. - `type: :file` - `:file` - `type: :image` - `:image` - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `source: BetaManagedAgentsBase64DocumentSource | BetaManagedAgentsPlainTextDocumentSource | BetaManagedAgentsURLDocumentSource | BetaManagedAgentsFileDocumentSource` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `data: String` Base64-encoded document data. - `media_type: String` MIME type of the document (e.g., "application/pdf"). - `type: :base64` - `:base64` - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `data: String` The plain text content. - `media_type: :"text/plain"` MIME type of the text content. Must be "text/plain". - `:"text/plain"` - `type: :text` - `:text` - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: :url` - `:url` - `url: String` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `file_id: String` ID of a previously uploaded file. - `type: :file` - `:file` - `type: :document` - `:document` - `context: String` Additional context about the document for the model. - `title: String` The title of the document. - `type: :"user.message"` - `:"user.message"` - `processed_at: Time` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent` An interrupt event that pauses agent execution and returns control to the user. - `id: String` Unique identifier for this event. - `type: :"user.interrupt"` - `:"user.interrupt"` - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `result: :allow | :deny` UserToolConfirmationResult enum - `:allow` - `:deny` - `tool_use_id: String` 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. - `type: :"user.tool_confirmation"` - `:"user.tool_confirmation"` - `deny_message: String` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `custom_tool_use_id: String` 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. - `type: :"user.custom_tool_result"` - `:"user.custom_tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` 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. - `citations: BetaManagedAgentsSearchResultCitations` Citation settings for a search result. - `enabled: bool` Whether citations are enabled for this search result. - `content: Array[BetaManagedAgentsSearchResultContent]` Array of text content blocks from the search result. - `text: String` The text content. - `type: :text` - `:text` - `source: String` The URL source of the search result. - `title: String` The title of the search result. - `type: :search_result` - `:search_result` - `is_error: bool` Whether the tool execution resulted in an error. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `input: Hash[Symbol, untyped]` Input parameters for the tool call. - `name: String` Name of the custom tool being called. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.custom_tool_use"` - `:"agent.custom_tool_use"` - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `content: Array[BetaManagedAgentsTextBlock]` Array of text blocks comprising the agent response. - `text: String` The text content. - `type: :text` - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.message"` - `:"agent.message"` - `class BetaManagedAgentsAgentThinkingEvent` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.thinking"` - `:"agent.thinking"` - `class BetaManagedAgentsAgentMCPToolUseEvent` Event emitted when the agent invokes a tool provided by an MCP server. - `id: String` Unique identifier for this event. - `input: Hash[Symbol, untyped]` Input parameters for the tool call. - `mcp_server_name: String` Name of the MCP server providing the tool. - `name: String` Name of the MCP tool being used. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.mcp_tool_use"` - `:"agent.mcp_tool_use"` - `evaluated_permission: :allow | :ask | :deny` AgentEvaluatedPermission enum - `:allow` - `:ask` - `:deny` - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `mcp_tool_use_id: String` The id of the `agent.mcp_tool_use` event this result corresponds to. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.mcp_tool_result"` - `:"agent.mcp_tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: bool` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent` Event emitted when the agent invokes a built-in agent tool. - `id: String` Unique identifier for this event. - `input: Hash[Symbol, untyped]` Input parameters for the tool call. - `name: String` Name of the agent tool being used. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.tool_use"` - `:"agent.tool_use"` - `evaluated_permission: :allow | :ask | :deny` AgentEvaluatedPermission enum - `:allow` - `:ask` - `:deny` - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `tool_use_id: String` The id of the `agent.tool_use` event this result corresponds to. - `type: :"agent.tool_result"` - `:"agent.tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: bool` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentThreadMessageReceivedEvent` Delivery event written to the target thread's input stream when an agent-to-agent message arrives. - `id: String` Unique identifier for this event. - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock]` 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. - `from_session_thread_id: String` Public `sthr_` ID of the thread that sent the message. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.thread_message_received"` - `:"agent.thread_message_received"` - `from_agent_name: String` 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. - `id: String` Unique identifier for this event. - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock]` 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. - `processed_at: Time` A timestamp in RFC 3339 format - `to_session_thread_id: String` Public `sthr_` ID of the thread the message was sent to. - `type: :"agent.thread_message_sent"` - `:"agent.thread_message_sent"` - `to_agent_name: String` 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. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"agent.thread_context_compacted"` - `:"agent.thread_context_compacted"` - `class BetaManagedAgentsSessionErrorEvent` An error event indicating a problem occurred during session execution. - `id: String` Unique identifier for this event. - `error: BetaManagedAgentsUnknownError | BetaManagedAgentsModelOverloadedError | BetaManagedAgentsModelRateLimitedError | 4 more` 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. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `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. - `type: :exhausted` - `:exhausted` - `class BetaManagedAgentsRetryStatusTerminal` The session encountered a terminal error and will transition to `terminated` state. - `type: :terminal` - `:terminal` - `type: :unknown_error` - `:unknown_error` - `class BetaManagedAgentsModelOverloadedError` The model is currently overloaded. Emitted after automatic retries are exhausted. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :model_overloaded_error` - `:model_overloaded_error` - `class BetaManagedAgentsModelRateLimitedError` The model request was rate-limited. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :model_rate_limited_error` - `:model_rate_limited_error` - `class BetaManagedAgentsModelRequestFailedError` A model request failed for a reason other than overload or rate-limiting. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :model_request_failed_error` - `:model_request_failed_error` - `class BetaManagedAgentsMCPConnectionFailedError` Failed to connect to an MCP server. - `mcp_server_name: String` Name of the MCP server that failed to connect. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :mcp_connection_failed_error` - `:mcp_connection_failed_error` - `class BetaManagedAgentsMCPAuthenticationFailedError` Authentication to an MCP server failed. - `mcp_server_name: String` Name of the MCP server that failed authentication. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :mcp_authentication_failed_error` - `:mcp_authentication_failed_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. - `message: String` Human-readable error description. - `retry_status: BetaManagedAgentsRetryStatusRetrying | BetaManagedAgentsRetryStatusExhausted | BetaManagedAgentsRetryStatusTerminal` 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. - `type: :billing_error` - `:billing_error` - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.error"` - `:"session.error"` - `class BetaManagedAgentsSessionStatusRescheduledEvent` Indicates the session is recovering from an error state and is rescheduled for execution. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.status_rescheduled"` - `:"session.status_rescheduled"` - `class BetaManagedAgentsSessionStatusRunningEvent` Indicates the session is actively running and the agent is working. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.status_running"` - `:"session.status_running"` - `class BetaManagedAgentsSessionStatusIdleEvent` Indicates the agent has paused and is awaiting user input. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `stop_reason: BetaManagedAgentsSessionEndTurn | BetaManagedAgentsSessionRequiresAction | BetaManagedAgentsSessionRetriesExhausted` 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. - `type: :end_turn` - `:end_turn` - `class BetaManagedAgentsSessionRequiresAction` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `event_ids: Array[String]` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `type: :requires_action` - `:requires_action` - `class BetaManagedAgentsSessionRetriesExhausted` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `type: :retries_exhausted` - `:retries_exhausted` - `type: :"session.status_idle"` - `:"session.status_idle"` - `class BetaManagedAgentsSessionStatusTerminatedEvent` Indicates the session has terminated, either due to an error or completion. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.status_terminated"` - `:"session.status_terminated"` - `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. - `id: String` Unique identifier for this event. - `agent_name: String` Name of the callable agent the thread runs. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Public `sthr_` ID of the newly created thread. - `type: :"session.thread_created"` - `:"session.thread_created"` - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent` Emitted when an outcome evaluation cycle begins. - `id: String` Unique identifier for this event. - `iteration: Integer` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `outcome_id: String` The `outc_` ID of the outcome being evaluated. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"span.outcome_evaluation_start"` - `:"span.outcome_evaluation_start"` - `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. - `id: String` Unique identifier for this event. - `explanation: String` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `iteration: Integer` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `outcome_evaluation_start_id: String` The id of the corresponding `span.outcome_evaluation_start` event. - `outcome_id: String` The `outc_` ID of the outcome being evaluated. - `processed_at: Time` A timestamp in RFC 3339 format - `result: String` 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. - `type: :"span.outcome_evaluation_end"` - `:"span.outcome_evaluation_end"` - `usage: BetaManagedAgentsSpanModelUsage` Token usage for a single model request. - `cache_creation_input_tokens: Integer` Tokens used to create prompt cache in this request. - `cache_read_input_tokens: Integer` Tokens read from prompt cache in this request. - `input_tokens: Integer` Input tokens consumed by this request. - `output_tokens: Integer` Output tokens generated by this request. - `speed: :standard | :fast` 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` - `:fast` - `class BetaManagedAgentsSpanModelRequestStartEvent` Emitted when a model request is initiated by the agent. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"span.model_request_start"` - `:"span.model_request_start"` - `class BetaManagedAgentsSpanModelRequestEndEvent` Emitted when a model request completes. - `id: String` Unique identifier for this event. - `is_error: bool` Whether the model request resulted in an error. - `model_request_start_id: String` The id of the corresponding `span.model_request_start` event. - `model_usage: BetaManagedAgentsSpanModelUsage` Token usage for a single model request. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"span.model_request_end"` - `:"span.model_request_end"` - `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. - `id: String` Unique identifier for this event. - `iteration: Integer` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `outcome_id: String` The `outc_` ID of the outcome being evaluated. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"span.outcome_evaluation_ongoing"` - `:"span.outcome_evaluation_ongoing"` - `class BetaManagedAgentsUserDefineOutcomeEvent` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `id: String` Unique identifier for this event. - `description: String` What the agent should produce. Copied from the input event. - `max_iterations: Integer` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `outcome_id: String` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `processed_at: Time` A timestamp in RFC 3339 format - `rubric: BetaManagedAgentsFileRubric | BetaManagedAgentsTextRubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric` Rubric referenced by a file uploaded via the Files API. - `file_id: String` ID of the rubric file. - `type: :file` - `:file` - `class BetaManagedAgentsTextRubric` Rubric content provided inline as text. - `content: String` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `type: :text` - `:text` - `type: :"user.define_outcome"` - `:"user.define_outcome"` - `class BetaManagedAgentsSessionDeletedEvent` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.deleted"` - `:"session.deleted"` - `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. - `id: String` Unique identifier for this event. - `agent_name: String` Name of the agent the thread runs. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Public sthr_ ID of the thread that started running. - `type: :"session.thread_status_running"` - `:"session.thread_status_running"` - `class BetaManagedAgentsSessionThreadStatusIdleEvent` A session thread has yielded and is awaiting input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `id: String` Unique identifier for this event. - `agent_name: String` Name of the agent the thread runs. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Public sthr_ ID of the thread that went idle. - `stop_reason: BetaManagedAgentsSessionEndTurn | BetaManagedAgentsSessionRequiresAction | BetaManagedAgentsSessionRetriesExhausted` 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'`). - `type: :"session.thread_status_idle"` - `:"session.thread_status_idle"` - `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. - `id: String` Unique identifier for this event. - `agent_name: String` Name of the agent the thread runs. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Public sthr_ ID of the thread that terminated. - `type: :"session.thread_status_terminated"` - `:"session.thread_status_terminated"` - `class BetaManagedAgentsUserToolResultEvent` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `id: String` Unique identifier for this event. - `tool_use_id: String` 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. - `type: :"user.tool_result"` - `:"user.tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: bool` Whether the tool execution resulted in an error. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` 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. - `id: String` Unique identifier for this event. - `agent_name: String` Name of the agent the thread runs. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Public sthr_ ID of the thread that is retrying. - `type: :"session.thread_status_rescheduled"` - `:"session.thread_status_rescheduled"` - `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. - `id: String` Unique identifier for this event. - `processed_at: Time` A timestamp in RFC 3339 format - `type: :"session.updated"` - `:"session.updated"` - `agent: BetaManagedAgentsSessionAgent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `id: String` - `description: String` - `mcp_servers: Array[BetaManagedAgentsMCPServerURLDefinition]` - `name: String` - `type: :url` - `:url` - `url: String` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `id: BetaManagedAgentsModel` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `BetaManagedAgentsModel = :"claude-opus-4-8" | :"claude-opus-4-7" | :"claude-opus-4-6" | 7 more` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `:"claude-opus-4-8"` Frontier intelligence for long-running agents and coding - `:"claude-opus-4-7"` Frontier intelligence for long-running agents and coding - `:"claude-opus-4-6"` Most intelligent model for building agents and coding - `:"claude-sonnet-4-6"` Best combination of speed and intelligence - `:"claude-haiku-4-5"` Fastest model with near-frontier intelligence - `:"claude-haiku-4-5-20251001"` Fastest model with near-frontier intelligence - `:"claude-opus-4-5"` Premium model combining maximum intelligence with practical performance - `:"claude-opus-4-5-20251101"` Premium model combining maximum intelligence with practical performance - `:"claude-sonnet-4-5"` High-performance model for agents and coding - `:"claude-sonnet-4-5-20250929"` High-performance model for agents and coding - `String = String` - `speed: :standard | :fast` 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` - `:fast` - `multiagent: BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `agents: Array[BetaManagedAgentsSessionThreadAgent]` Full `agent` definitions the coordinator may spawn as session threads. - `id: String` - `description: String` - `mcp_servers: Array[BetaManagedAgentsMCPServerURLDefinition]` - `name: String` - `type: :url` - `url: String` - `model: BetaManagedAgentsModelConfig` Model identifier and configuration. - `name: String` - `skills: Array[BetaManagedAgentsAnthropicSkill | BetaManagedAgentsCustomSkill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `skill_id: String` - `type: :anthropic` - `:anthropic` - `version: String` - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `skill_id: String` - `type: :custom` - `:custom` - `version: String` - `system_: String` - `tools: Array[BetaManagedAgentsAgentToolset20260401 | BetaManagedAgentsMCPToolset | BetaManagedAgentsCustomTool]` - `class BetaManagedAgentsAgentToolset20260401` - `configs: Array[BetaManagedAgentsAgentToolConfig]` - `enabled: bool` - `name: :bash | :edit | :read | 5 more` Built-in agent tool identifier. - `:bash` - `:edit` - `:read` - `:write` - `:glob` - `:grep` - `:web_fetch` - `:web_search` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `type: :always_allow` - `:always_allow` - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: :always_ask` - `:always_ask` - `default_config: BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `enabled: bool` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `type: :agent_toolset_20260401` - `:agent_toolset_20260401` - `class BetaManagedAgentsMCPToolset` - `configs: Array[BetaManagedAgentsMCPToolConfig]` - `enabled: bool` - `name: String` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `default_config: BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `enabled: bool` - `permission_policy: BetaManagedAgentsAlwaysAllowPolicy | BetaManagedAgentsAlwaysAskPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy` Tool calls require user confirmation before execution. - `mcp_server_name: String` - `type: :mcp_toolset` - `:mcp_toolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `description: String` - `input_schema: BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `properties: Hash[Symbol, untyped]` JSON Schema properties defining the tool's input parameters. - `required: Array[String]` List of required property names. - `type: :object` Must be 'object' for tool input schemas. - `:object` - `name: String` - `type: :custom` - `:custom` - `type: :agent` - `:agent` - `version: Integer` - `type: :coordinator` - `:coordinator` - `name: String` - `skills: Array[BetaManagedAgentsAnthropicSkill | BetaManagedAgentsCustomSkill]` - `class BetaManagedAgentsAnthropicSkill` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill` A resolved user-created custom skill. - `system_: String` - `tools: Array[BetaManagedAgentsAgentToolset20260401 | BetaManagedAgentsMCPToolset | BetaManagedAgentsCustomTool]` - `class BetaManagedAgentsAgentToolset20260401` - `class BetaManagedAgentsMCPToolset` - `class BetaManagedAgentsCustomTool` A custom tool as returned in API responses. - `type: :agent` - `:agent` - `version: Integer` - `metadata: Hash[Symbol, String]` The session's full metadata bag after the update. Present when the update set non-empty metadata; absent when metadata was unchanged or cleared to empty. - `title: String` The session's new title. Present only when the update changed it. ### Example ```ruby require "anthropic" anthropic = Anthropic::Client.new(api_key: "my-anthropic-api-key") beta_managed_agents_stream_session_thread_events = anthropic.beta.sessions.threads.events.stream( "sthr_011CZkZVWa6oIjw0rgXZpnBt", session_id: "sesn_011CZkZAtmR3yMPDzynEDxu7" ) puts(beta_managed_agents_stream_session_thread_events) ``` #### Response ```json { "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ```