# Events ## List Session Thread Events `client.Beta.Sessions.Threads.Events.List(ctx, threadID, params) (*PageCursor[BetaManagedAgentsSessionEventUnion], error)` **get** `/v1/sessions/{session_id}/threads/{thread_id}/events` List Session Thread Events ### Parameters - `threadID string` - `params BetaSessionThreadEventListParams` - `SessionID param.Field[string]` Path param: Path parameter session_id - `Limit param.Field[int64]` Query param: Query parameter for limit - `Page param.Field[string]` Query param: Query parameter for page - `Betas param.Field[[]AnthropicBeta]` Header param: Optional header to specify the beta version(s) you want to use. - `string` - `type AnthropicBeta string` - `const AnthropicBetaMessageBatches2024_09_24 AnthropicBeta = "message-batches-2024-09-24"` - `const AnthropicBetaPromptCaching2024_07_31 AnthropicBeta = "prompt-caching-2024-07-31"` - `const AnthropicBetaComputerUse2024_10_22 AnthropicBeta = "computer-use-2024-10-22"` - `const AnthropicBetaComputerUse2025_01_24 AnthropicBeta = "computer-use-2025-01-24"` - `const AnthropicBetaPDFs2024_09_25 AnthropicBeta = "pdfs-2024-09-25"` - `const AnthropicBetaTokenCounting2024_11_01 AnthropicBeta = "token-counting-2024-11-01"` - `const AnthropicBetaTokenEfficientTools2025_02_19 AnthropicBeta = "token-efficient-tools-2025-02-19"` - `const AnthropicBetaOutput128k2025_02_19 AnthropicBeta = "output-128k-2025-02-19"` - `const AnthropicBetaFilesAPI2025_04_14 AnthropicBeta = "files-api-2025-04-14"` - `const AnthropicBetaMCPClient2025_04_04 AnthropicBeta = "mcp-client-2025-04-04"` - `const AnthropicBetaMCPClient2025_11_20 AnthropicBeta = "mcp-client-2025-11-20"` - `const AnthropicBetaDevFullThinking2025_05_14 AnthropicBeta = "dev-full-thinking-2025-05-14"` - `const AnthropicBetaInterleavedThinking2025_05_14 AnthropicBeta = "interleaved-thinking-2025-05-14"` - `const AnthropicBetaCodeExecution2025_05_22 AnthropicBeta = "code-execution-2025-05-22"` - `const AnthropicBetaExtendedCacheTTL2025_04_11 AnthropicBeta = "extended-cache-ttl-2025-04-11"` - `const AnthropicBetaContext1m2025_08_07 AnthropicBeta = "context-1m-2025-08-07"` - `const AnthropicBetaContextManagement2025_06_27 AnthropicBeta = "context-management-2025-06-27"` - `const AnthropicBetaModelContextWindowExceeded2025_08_26 AnthropicBeta = "model-context-window-exceeded-2025-08-26"` - `const AnthropicBetaSkills2025_10_02 AnthropicBeta = "skills-2025-10-02"` - `const AnthropicBetaFastMode2026_02_01 AnthropicBeta = "fast-mode-2026-02-01"` - `const AnthropicBetaOutput300k2026_03_24 AnthropicBeta = "output-300k-2026-03-24"` - `const AnthropicBetaUserProfiles2026_03_24 AnthropicBeta = "user-profiles-2026-03-24"` - `const AnthropicBetaAdvisorTool2026_03_01 AnthropicBeta = "advisor-tool-2026-03-01"` - `const AnthropicBetaManagedAgents2026_04_01 AnthropicBeta = "managed-agents-2026-04-01"` - `const AnthropicBetaCacheDiagnosis2026_04_07 AnthropicBeta = "cache-diagnosis-2026-04-07"` - `const AnthropicBetaThinkingTokenCount2026_05_13 AnthropicBeta = "thinking-token-count-2026-05-13"` ### Returns - `type BetaManagedAgentsSessionEventUnion interface{…}` Union type for all event types in a session. - `type BetaManagedAgentsUserMessageEvent struct{…}` A user message event in the session conversation. - `ID string` Unique identifier for this event. - `Content []BetaManagedAgentsUserMessageEventContentUnion` Array of content blocks comprising the user message. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `Text string` The text content. - `Type BetaManagedAgentsTextBlockType` - `const BetaManagedAgentsTextBlockTypeText BetaManagedAgentsTextBlockType = "text"` - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `Source BetaManagedAgentsImageBlockSourceUnion` Union type for image source variants. - `type BetaManagedAgentsBase64ImageSource struct{…}` Base64-encoded image data. - `Data string` Base64-encoded image data. - `MediaType string` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `Type BetaManagedAgentsBase64ImageSourceType` - `const BetaManagedAgentsBase64ImageSourceTypeBase64 BetaManagedAgentsBase64ImageSourceType = "base64"` - `type BetaManagedAgentsURLImageSource struct{…}` Image referenced by URL. - `Type BetaManagedAgentsURLImageSourceType` - `const BetaManagedAgentsURLImageSourceTypeURL BetaManagedAgentsURLImageSourceType = "url"` - `URL string` URL of the image to fetch. - `type BetaManagedAgentsFileImageSource struct{…}` Image referenced by file ID. - `FileID string` ID of a previously uploaded file. - `Type BetaManagedAgentsFileImageSourceType` - `const BetaManagedAgentsFileImageSourceTypeFile BetaManagedAgentsFileImageSourceType = "file"` - `Type BetaManagedAgentsImageBlockType` - `const BetaManagedAgentsImageBlockTypeImage BetaManagedAgentsImageBlockType = "image"` - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `Source BetaManagedAgentsDocumentBlockSourceUnion` Union type for document source variants. - `type BetaManagedAgentsBase64DocumentSource struct{…}` Base64-encoded document data. - `Data string` Base64-encoded document data. - `MediaType string` MIME type of the document (e.g., "application/pdf"). - `Type BetaManagedAgentsBase64DocumentSourceType` - `const BetaManagedAgentsBase64DocumentSourceTypeBase64 BetaManagedAgentsBase64DocumentSourceType = "base64"` - `type BetaManagedAgentsPlainTextDocumentSource struct{…}` Plain text document content. - `Data string` The plain text content. - `MediaType BetaManagedAgentsPlainTextDocumentSourceMediaType` MIME type of the text content. Must be "text/plain". - `const BetaManagedAgentsPlainTextDocumentSourceMediaTypeTextPlain BetaManagedAgentsPlainTextDocumentSourceMediaType = "text/plain"` - `Type BetaManagedAgentsPlainTextDocumentSourceType` - `const BetaManagedAgentsPlainTextDocumentSourceTypeText BetaManagedAgentsPlainTextDocumentSourceType = "text"` - `type BetaManagedAgentsURLDocumentSource struct{…}` Document referenced by URL. - `Type BetaManagedAgentsURLDocumentSourceType` - `const BetaManagedAgentsURLDocumentSourceTypeURL BetaManagedAgentsURLDocumentSourceType = "url"` - `URL string` URL of the document to fetch. - `type BetaManagedAgentsFileDocumentSource struct{…}` Document referenced by file ID. - `FileID string` ID of a previously uploaded file. - `Type BetaManagedAgentsFileDocumentSourceType` - `const BetaManagedAgentsFileDocumentSourceTypeFile BetaManagedAgentsFileDocumentSourceType = "file"` - `Type BetaManagedAgentsDocumentBlockType` - `const BetaManagedAgentsDocumentBlockTypeDocument BetaManagedAgentsDocumentBlockType = "document"` - `Context string` Additional context about the document for the model. - `Title string` The title of the document. - `Type BetaManagedAgentsUserMessageEventType` - `const BetaManagedAgentsUserMessageEventTypeUserMessage BetaManagedAgentsUserMessageEventType = "user.message"` - `ProcessedAt Time` A timestamp in RFC 3339 format - `type BetaManagedAgentsUserInterruptEvent struct{…}` An interrupt event that pauses agent execution and returns control to the user. - `ID string` Unique identifier for this event. - `Type BetaManagedAgentsUserInterruptEventType` - `const BetaManagedAgentsUserInterruptEventTypeUserInterrupt BetaManagedAgentsUserInterruptEventType = "user.interrupt"` - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID 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. - `type BetaManagedAgentsUserToolConfirmationEvent struct{…}` A tool confirmation event that approves or denies a pending tool execution. - `ID string` Unique identifier for this event. - `Result BetaManagedAgentsUserToolConfirmationEventResult` UserToolConfirmationResult enum - `const BetaManagedAgentsUserToolConfirmationEventResultAllow BetaManagedAgentsUserToolConfirmationEventResult = "allow"` - `const BetaManagedAgentsUserToolConfirmationEventResultDeny BetaManagedAgentsUserToolConfirmationEventResult = "deny"` - `ToolUseID 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 BetaManagedAgentsUserToolConfirmationEventType` - `const BetaManagedAgentsUserToolConfirmationEventTypeUserToolConfirmation BetaManagedAgentsUserToolConfirmationEventType = "user.tool_confirmation"` - `DenyMessage string` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID 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. - `type BetaManagedAgentsUserCustomToolResultEvent struct{…}` Event sent by the client providing the result of a custom tool execution. - `ID string` Unique identifier for this event. - `CustomToolUseID 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 BetaManagedAgentsUserCustomToolResultEventType` - `const BetaManagedAgentsUserCustomToolResultEventTypeUserCustomToolResult BetaManagedAgentsUserCustomToolResultEventType = "user.custom_tool_result"` - `Content []BetaManagedAgentsUserCustomToolResultEventContentUnion` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` 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 []BetaManagedAgentsSearchResultContent` Array of text content blocks from the search result. - `Text string` The text content. - `Type BetaManagedAgentsSearchResultContentType` - `const BetaManagedAgentsSearchResultContentTypeText BetaManagedAgentsSearchResultContentType = "text"` - `Source string` The URL source of the search result. - `Title string` The title of the search result. - `Type BetaManagedAgentsSearchResultBlockType` - `const BetaManagedAgentsSearchResultBlockTypeSearchResult BetaManagedAgentsSearchResultBlockType = "search_result"` - `IsError bool` Whether the tool execution resulted in an error. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `type BetaManagedAgentsAgentCustomToolUseEvent struct{…}` 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 map[string, any]` Input parameters for the tool call. - `Name string` Name of the custom tool being called. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentCustomToolUseEventType` - `const BetaManagedAgentsAgentCustomToolUseEventTypeAgentCustomToolUse BetaManagedAgentsAgentCustomToolUseEventType = "agent.custom_tool_use"` - `SessionThreadID 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. - `type BetaManagedAgentsAgentMessageEvent struct{…}` An agent response event in the session conversation. - `ID string` Unique identifier for this event. - `Content []BetaManagedAgentsTextBlock` Array of text blocks comprising the agent response. - `Text string` The text content. - `Type BetaManagedAgentsTextBlockType` - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentMessageEventType` - `const BetaManagedAgentsAgentMessageEventTypeAgentMessage BetaManagedAgentsAgentMessageEventType = "agent.message"` - `type BetaManagedAgentsAgentThinkingEvent struct{…}` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentThinkingEventType` - `const BetaManagedAgentsAgentThinkingEventTypeAgentThinking BetaManagedAgentsAgentThinkingEventType = "agent.thinking"` - `type BetaManagedAgentsAgentMCPToolUseEvent struct{…}` Event emitted when the agent invokes a tool provided by an MCP server. - `ID string` Unique identifier for this event. - `Input map[string, any]` Input parameters for the tool call. - `MCPServerName string` Name of the MCP server providing the tool. - `Name string` Name of the MCP tool being used. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentMCPToolUseEventType` - `const BetaManagedAgentsAgentMCPToolUseEventTypeAgentMCPToolUse BetaManagedAgentsAgentMCPToolUseEventType = "agent.mcp_tool_use"` - `EvaluatedPermission BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermission` AgentEvaluatedPermission enum - `const BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermissionAllow BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermission = "allow"` - `const BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermissionAsk BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermission = "ask"` - `const BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermissionDeny BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermission = "deny"` - `SessionThreadID 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. - `type BetaManagedAgentsAgentMCPToolResultEvent struct{…}` Event representing the result of an MCP tool execution. - `ID string` Unique identifier for this event. - `MCPToolUseID string` The id of the `agent.mcp_tool_use` event this result corresponds to. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentMCPToolResultEventType` - `const BetaManagedAgentsAgentMCPToolResultEventTypeAgentMCPToolResult BetaManagedAgentsAgentMCPToolResultEventType = "agent.mcp_tool_result"` - `Content []BetaManagedAgentsAgentMCPToolResultEventContentUnion` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` A block containing a web search result. - `IsError bool` Whether the tool execution resulted in an error. - `type BetaManagedAgentsAgentToolUseEvent struct{…}` Event emitted when the agent invokes a built-in agent tool. - `ID string` Unique identifier for this event. - `Input map[string, any]` Input parameters for the tool call. - `Name string` Name of the agent tool being used. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentToolUseEventType` - `const BetaManagedAgentsAgentToolUseEventTypeAgentToolUse BetaManagedAgentsAgentToolUseEventType = "agent.tool_use"` - `EvaluatedPermission BetaManagedAgentsAgentToolUseEventEvaluatedPermission` AgentEvaluatedPermission enum - `const BetaManagedAgentsAgentToolUseEventEvaluatedPermissionAllow BetaManagedAgentsAgentToolUseEventEvaluatedPermission = "allow"` - `const BetaManagedAgentsAgentToolUseEventEvaluatedPermissionAsk BetaManagedAgentsAgentToolUseEventEvaluatedPermission = "ask"` - `const BetaManagedAgentsAgentToolUseEventEvaluatedPermissionDeny BetaManagedAgentsAgentToolUseEventEvaluatedPermission = "deny"` - `SessionThreadID 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. - `type BetaManagedAgentsAgentToolResultEvent struct{…}` Event representing the result of an agent tool execution. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `ToolUseID string` The id of the `agent.tool_use` event this result corresponds to. - `Type BetaManagedAgentsAgentToolResultEventType` - `const BetaManagedAgentsAgentToolResultEventTypeAgentToolResult BetaManagedAgentsAgentToolResultEventType = "agent.tool_result"` - `Content []BetaManagedAgentsAgentToolResultEventContentUnion` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` A block containing a web search result. - `IsError bool` Whether the tool execution resulted in an error. - `type BetaManagedAgentsAgentThreadMessageReceivedEvent struct{…}` 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 []BetaManagedAgentsAgentThreadMessageReceivedEventContentUnion` Message content blocks. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `FromSessionThreadID string` Public `sthr_` ID of the thread that sent the message. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentThreadMessageReceivedEventType` - `const BetaManagedAgentsAgentThreadMessageReceivedEventTypeAgentThreadMessageReceived BetaManagedAgentsAgentThreadMessageReceivedEventType = "agent.thread_message_received"` - `FromAgentName string` Name of the callable agent this message came from. Absent when received from the primary agent. - `type BetaManagedAgentsAgentThreadMessageSentEvent struct{…}` 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 []BetaManagedAgentsAgentThreadMessageSentEventContentUnion` Message content blocks. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `ProcessedAt Time` A timestamp in RFC 3339 format - `ToSessionThreadID string` Public `sthr_` ID of the thread the message was sent to. - `Type BetaManagedAgentsAgentThreadMessageSentEventType` - `const BetaManagedAgentsAgentThreadMessageSentEventTypeAgentThreadMessageSent BetaManagedAgentsAgentThreadMessageSentEventType = "agent.thread_message_sent"` - `ToAgentName string` Name of the callable agent this message was sent to. Absent when sent to the primary agent. - `type BetaManagedAgentsAgentThreadContextCompactedEvent struct{…}` Indicates that context compaction (summarization) occurred during the session. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentThreadContextCompactedEventType` - `const BetaManagedAgentsAgentThreadContextCompactedEventTypeAgentThreadContextCompacted BetaManagedAgentsAgentThreadContextCompactedEventType = "agent.thread_context_compacted"` - `type BetaManagedAgentsSessionErrorEvent struct{…}` An error event indicating a problem occurred during session execution. - `ID string` Unique identifier for this event. - `Error BetaManagedAgentsSessionErrorEventErrorUnion` An unknown or unexpected error occurred during session execution. A fallback variant; clients that don't recognize a new error code can match on `retry_status` and `message` alone. - `type BetaManagedAgentsUnknownError struct{…}` 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. - `RetryStatus BetaManagedAgentsUnknownErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusRetryingType` - `const BetaManagedAgentsRetryStatusRetryingTypeRetrying BetaManagedAgentsRetryStatusRetryingType = "retrying"` - `type BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `Type BetaManagedAgentsRetryStatusExhaustedType` - `const BetaManagedAgentsRetryStatusExhaustedTypeExhausted BetaManagedAgentsRetryStatusExhaustedType = "exhausted"` - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsRetryStatusTerminalType` - `const BetaManagedAgentsRetryStatusTerminalTypeTerminal BetaManagedAgentsRetryStatusTerminalType = "terminal"` - `Type BetaManagedAgentsUnknownErrorType` - `const BetaManagedAgentsUnknownErrorTypeUnknownError BetaManagedAgentsUnknownErrorType = "unknown_error"` - `type BetaManagedAgentsModelOverloadedError struct{…}` The model is currently overloaded. Emitted after automatic retries are exhausted. - `Message string` Human-readable error description. - `RetryStatus BetaManagedAgentsModelOverloadedErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsModelOverloadedErrorType` - `const BetaManagedAgentsModelOverloadedErrorTypeModelOverloadedError BetaManagedAgentsModelOverloadedErrorType = "model_overloaded_error"` - `type BetaManagedAgentsModelRateLimitedError struct{…}` The model request was rate-limited. - `Message string` Human-readable error description. - `RetryStatus BetaManagedAgentsModelRateLimitedErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsModelRateLimitedErrorType` - `const BetaManagedAgentsModelRateLimitedErrorTypeModelRateLimitedError BetaManagedAgentsModelRateLimitedErrorType = "model_rate_limited_error"` - `type BetaManagedAgentsModelRequestFailedError struct{…}` A model request failed for a reason other than overload or rate-limiting. - `Message string` Human-readable error description. - `RetryStatus BetaManagedAgentsModelRequestFailedErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsModelRequestFailedErrorType` - `const BetaManagedAgentsModelRequestFailedErrorTypeModelRequestFailedError BetaManagedAgentsModelRequestFailedErrorType = "model_request_failed_error"` - `type BetaManagedAgentsMCPConnectionFailedError struct{…}` Failed to connect to an MCP server. - `MCPServerName string` Name of the MCP server that failed to connect. - `Message string` Human-readable error description. - `RetryStatus BetaManagedAgentsMCPConnectionFailedErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsMCPConnectionFailedErrorType` - `const BetaManagedAgentsMCPConnectionFailedErrorTypeMCPConnectionFailedError BetaManagedAgentsMCPConnectionFailedErrorType = "mcp_connection_failed_error"` - `type BetaManagedAgentsMCPAuthenticationFailedError struct{…}` Authentication to an MCP server failed. - `MCPServerName string` Name of the MCP server that failed authentication. - `Message string` Human-readable error description. - `RetryStatus BetaManagedAgentsMCPAuthenticationFailedErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsMCPAuthenticationFailedErrorType` - `const BetaManagedAgentsMCPAuthenticationFailedErrorTypeMCPAuthenticationFailedError BetaManagedAgentsMCPAuthenticationFailedErrorType = "mcp_authentication_failed_error"` - `type BetaManagedAgentsBillingError struct{…}` 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. - `RetryStatus BetaManagedAgentsBillingErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsBillingErrorType` - `const BetaManagedAgentsBillingErrorTypeBillingError BetaManagedAgentsBillingErrorType = "billing_error"` - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionErrorEventType` - `const BetaManagedAgentsSessionErrorEventTypeSessionError BetaManagedAgentsSessionErrorEventType = "session.error"` - `type BetaManagedAgentsSessionStatusRescheduledEvent struct{…}` Indicates the session is recovering from an error state and is rescheduled for execution. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionStatusRescheduledEventType` - `const BetaManagedAgentsSessionStatusRescheduledEventTypeSessionStatusRescheduled BetaManagedAgentsSessionStatusRescheduledEventType = "session.status_rescheduled"` - `type BetaManagedAgentsSessionStatusRunningEvent struct{…}` Indicates the session is actively running and the agent is working. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionStatusRunningEventType` - `const BetaManagedAgentsSessionStatusRunningEventTypeSessionStatusRunning BetaManagedAgentsSessionStatusRunningEventType = "session.status_running"` - `type BetaManagedAgentsSessionStatusIdleEvent struct{…}` Indicates the agent has paused and is awaiting user input. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `StopReason BetaManagedAgentsSessionStatusIdleEventStopReasonUnion` The agent completed its turn naturally and is ready for the next user message. - `type BetaManagedAgentsSessionEndTurn struct{…}` The agent completed its turn naturally and is ready for the next user message. - `Type BetaManagedAgentsSessionEndTurnType` - `const BetaManagedAgentsSessionEndTurnTypeEndTurn BetaManagedAgentsSessionEndTurnType = "end_turn"` - `type BetaManagedAgentsSessionRequiresAction struct{…}` 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. - `EventIDs []string` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `Type BetaManagedAgentsSessionRequiresActionType` - `const BetaManagedAgentsSessionRequiresActionTypeRequiresAction BetaManagedAgentsSessionRequiresActionType = "requires_action"` - `type BetaManagedAgentsSessionRetriesExhausted struct{…}` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `Type BetaManagedAgentsSessionRetriesExhaustedType` - `const BetaManagedAgentsSessionRetriesExhaustedTypeRetriesExhausted BetaManagedAgentsSessionRetriesExhaustedType = "retries_exhausted"` - `Type BetaManagedAgentsSessionStatusIdleEventType` - `const BetaManagedAgentsSessionStatusIdleEventTypeSessionStatusIdle BetaManagedAgentsSessionStatusIdleEventType = "session.status_idle"` - `type BetaManagedAgentsSessionStatusTerminatedEvent struct{…}` Indicates the session has terminated, either due to an error or completion. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionStatusTerminatedEventType` - `const BetaManagedAgentsSessionStatusTerminatedEventTypeSessionStatusTerminated BetaManagedAgentsSessionStatusTerminatedEventType = "session.status_terminated"` - `type BetaManagedAgentsSessionThreadCreatedEvent struct{…}` 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. - `AgentName string` Name of the callable agent the thread runs. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Public `sthr_` ID of the newly created thread. - `Type BetaManagedAgentsSessionThreadCreatedEventType` - `const BetaManagedAgentsSessionThreadCreatedEventTypeSessionThreadCreated BetaManagedAgentsSessionThreadCreatedEventType = "session.thread_created"` - `type BetaManagedAgentsSpanOutcomeEvaluationStartEvent struct{…}` Emitted when an outcome evaluation cycle begins. - `ID string` Unique identifier for this event. - `Iteration int64` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `OutcomeID string` The `outc_` ID of the outcome being evaluated. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSpanOutcomeEvaluationStartEventType` - `const BetaManagedAgentsSpanOutcomeEvaluationStartEventTypeSpanOutcomeEvaluationStart BetaManagedAgentsSpanOutcomeEvaluationStartEventType = "span.outcome_evaluation_start"` - `type BetaManagedAgentsSpanOutcomeEvaluationEndEvent struct{…}` 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 int64` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `OutcomeEvaluationStartID string` The id of the corresponding `span.outcome_evaluation_start` event. - `OutcomeID string` The `outc_` ID of the outcome being evaluated. - `ProcessedAt 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 BetaManagedAgentsSpanOutcomeEvaluationEndEventType` - `const BetaManagedAgentsSpanOutcomeEvaluationEndEventTypeSpanOutcomeEvaluationEnd BetaManagedAgentsSpanOutcomeEvaluationEndEventType = "span.outcome_evaluation_end"` - `Usage BetaManagedAgentsSpanModelUsage` Token usage for a single model request. - `CacheCreationInputTokens int64` Tokens used to create prompt cache in this request. - `CacheReadInputTokens int64` Tokens read from prompt cache in this request. - `InputTokens int64` Input tokens consumed by this request. - `OutputTokens int64` Output tokens generated by this request. - `Speed BetaManagedAgentsSpanModelUsageSpeed` 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. - `const BetaManagedAgentsSpanModelUsageSpeedStandard BetaManagedAgentsSpanModelUsageSpeed = "standard"` - `const BetaManagedAgentsSpanModelUsageSpeedFast BetaManagedAgentsSpanModelUsageSpeed = "fast"` - `type BetaManagedAgentsSpanModelRequestStartEvent struct{…}` Emitted when a model request is initiated by the agent. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSpanModelRequestStartEventType` - `const BetaManagedAgentsSpanModelRequestStartEventTypeSpanModelRequestStart BetaManagedAgentsSpanModelRequestStartEventType = "span.model_request_start"` - `type BetaManagedAgentsSpanModelRequestEndEvent struct{…}` Emitted when a model request completes. - `ID string` Unique identifier for this event. - `IsError bool` Whether the model request resulted in an error. - `ModelRequestStartID string` The id of the corresponding `span.model_request_start` event. - `ModelUsage BetaManagedAgentsSpanModelUsage` Token usage for a single model request. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSpanModelRequestEndEventType` - `const BetaManagedAgentsSpanModelRequestEndEventTypeSpanModelRequestEnd BetaManagedAgentsSpanModelRequestEndEventType = "span.model_request_end"` - `type BetaManagedAgentsSpanOutcomeEvaluationOngoingEvent struct{…}` 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 int64` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `OutcomeID string` The `outc_` ID of the outcome being evaluated. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSpanOutcomeEvaluationOngoingEventType` - `const BetaManagedAgentsSpanOutcomeEvaluationOngoingEventTypeSpanOutcomeEvaluationOngoing BetaManagedAgentsSpanOutcomeEvaluationOngoingEventType = "span.outcome_evaluation_ongoing"` - `type BetaManagedAgentsUserDefineOutcomeEvent struct{…}` 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. - `MaxIterations int64` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `OutcomeID string` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Rubric BetaManagedAgentsUserDefineOutcomeEventRubricUnion` Rubric for grading the quality of an outcome. - `type BetaManagedAgentsFileRubric struct{…}` Rubric referenced by a file uploaded via the Files API. - `FileID string` ID of the rubric file. - `Type BetaManagedAgentsFileRubricType` - `const BetaManagedAgentsFileRubricTypeFile BetaManagedAgentsFileRubricType = "file"` - `type BetaManagedAgentsTextRubric struct{…}` Rubric content provided inline as text. - `Content string` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `Type BetaManagedAgentsTextRubricType` - `const BetaManagedAgentsTextRubricTypeText BetaManagedAgentsTextRubricType = "text"` - `Type BetaManagedAgentsUserDefineOutcomeEventType` - `const BetaManagedAgentsUserDefineOutcomeEventTypeUserDefineOutcome BetaManagedAgentsUserDefineOutcomeEventType = "user.define_outcome"` - `type BetaManagedAgentsSessionDeletedEvent struct{…}` 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. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionDeletedEventType` - `const BetaManagedAgentsSessionDeletedEventTypeSessionDeleted BetaManagedAgentsSessionDeletedEventType = "session.deleted"` - `type BetaManagedAgentsSessionThreadStatusRunningEvent struct{…}` 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. - `AgentName string` Name of the agent the thread runs. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Public sthr_ ID of the thread that started running. - `Type BetaManagedAgentsSessionThreadStatusRunningEventType` - `const BetaManagedAgentsSessionThreadStatusRunningEventTypeSessionThreadStatusRunning BetaManagedAgentsSessionThreadStatusRunningEventType = "session.thread_status_running"` - `type BetaManagedAgentsSessionThreadStatusIdleEvent struct{…}` 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. - `AgentName string` Name of the agent the thread runs. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Public sthr_ ID of the thread that went idle. - `StopReason BetaManagedAgentsSessionThreadStatusIdleEventStopReasonUnion` The agent completed its turn naturally and is ready for the next user message. - `type BetaManagedAgentsSessionEndTurn struct{…}` The agent completed its turn naturally and is ready for the next user message. - `type BetaManagedAgentsSessionRequiresAction struct{…}` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `type BetaManagedAgentsSessionRetriesExhausted struct{…}` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `Type BetaManagedAgentsSessionThreadStatusIdleEventType` - `const BetaManagedAgentsSessionThreadStatusIdleEventTypeSessionThreadStatusIdle BetaManagedAgentsSessionThreadStatusIdleEventType = "session.thread_status_idle"` - `type BetaManagedAgentsSessionThreadStatusTerminatedEvent struct{…}` 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. - `AgentName string` Name of the agent the thread runs. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Public sthr_ ID of the thread that terminated. - `Type BetaManagedAgentsSessionThreadStatusTerminatedEventType` - `const BetaManagedAgentsSessionThreadStatusTerminatedEventTypeSessionThreadStatusTerminated BetaManagedAgentsSessionThreadStatusTerminatedEventType = "session.thread_status_terminated"` - `type BetaManagedAgentsUserToolResultEvent struct{…}` 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. - `ToolUseID 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 BetaManagedAgentsUserToolResultEventType` - `const BetaManagedAgentsUserToolResultEventTypeUserToolResult BetaManagedAgentsUserToolResultEventType = "user.tool_result"` - `Content []BetaManagedAgentsUserToolResultEventContentUnion` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` A block containing a web search result. - `IsError bool` Whether the tool execution resulted in an error. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `type BetaManagedAgentsSessionThreadStatusRescheduledEvent struct{…}` 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. - `AgentName string` Name of the agent the thread runs. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Public sthr_ ID of the thread that is retrying. - `Type BetaManagedAgentsSessionThreadStatusRescheduledEventType` - `const BetaManagedAgentsSessionThreadStatusRescheduledEventTypeSessionThreadStatusRescheduled BetaManagedAgentsSessionThreadStatusRescheduledEventType = "session.thread_status_rescheduled"` - `type BetaManagedAgentsSessionUpdatedEvent struct{…}` 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. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionUpdatedEventType` - `const BetaManagedAgentsSessionUpdatedEventTypeSessionUpdated BetaManagedAgentsSessionUpdatedEventType = "session.updated"` - `Agent BetaManagedAgentsSessionAgent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `ID string` - `Description string` - `MCPServers []BetaManagedAgentsMCPServerURLDefinition` - `Name string` - `Type BetaManagedAgentsMCPServerURLDefinitionType` - `const BetaManagedAgentsMCPServerURLDefinitionTypeURL BetaManagedAgentsMCPServerURLDefinitionType = "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. - `type BetaManagedAgentsModel string` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `const BetaManagedAgentsModelClaudeOpus4_8 BetaManagedAgentsModel = "claude-opus-4-8"` Frontier intelligence for long-running agents and coding - `const BetaManagedAgentsModelClaudeOpus4_7 BetaManagedAgentsModel = "claude-opus-4-7"` Frontier intelligence for long-running agents and coding - `const BetaManagedAgentsModelClaudeOpus4_6 BetaManagedAgentsModel = "claude-opus-4-6"` Most intelligent model for building agents and coding - `const BetaManagedAgentsModelClaudeSonnet4_6 BetaManagedAgentsModel = "claude-sonnet-4-6"` Best combination of speed and intelligence - `const BetaManagedAgentsModelClaudeHaiku4_5 BetaManagedAgentsModel = "claude-haiku-4-5"` Fastest model with near-frontier intelligence - `const BetaManagedAgentsModelClaudeHaiku4_5_20251001 BetaManagedAgentsModel = "claude-haiku-4-5-20251001"` Fastest model with near-frontier intelligence - `const BetaManagedAgentsModelClaudeOpus4_5 BetaManagedAgentsModel = "claude-opus-4-5"` Premium model combining maximum intelligence with practical performance - `const BetaManagedAgentsModelClaudeOpus4_5_20251101 BetaManagedAgentsModel = "claude-opus-4-5-20251101"` Premium model combining maximum intelligence with practical performance - `const BetaManagedAgentsModelClaudeSonnet4_5 BetaManagedAgentsModel = "claude-sonnet-4-5"` High-performance model for agents and coding - `const BetaManagedAgentsModelClaudeSonnet4_5_20250929 BetaManagedAgentsModel = "claude-sonnet-4-5-20250929"` High-performance model for agents and coding - `string` - `Speed BetaManagedAgentsModelConfigSpeed` 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. - `const BetaManagedAgentsModelConfigSpeedStandard BetaManagedAgentsModelConfigSpeed = "standard"` - `const BetaManagedAgentsModelConfigSpeedFast BetaManagedAgentsModelConfigSpeed = "fast"` - `Multiagent BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `Agents []BetaManagedAgentsSessionThreadAgent` Full `agent` definitions the coordinator may spawn as session threads. - `ID string` - `Description string` - `MCPServers []BetaManagedAgentsMCPServerURLDefinition` - `Name string` - `Type BetaManagedAgentsMCPServerURLDefinitionType` - `URL string` - `Model BetaManagedAgentsModelConfig` Model identifier and configuration. - `Name string` - `Skills []BetaManagedAgentsSessionThreadAgentSkillUnion` - `type BetaManagedAgentsAnthropicSkill struct{…}` A resolved Anthropic-managed skill. - `SkillID string` - `Type BetaManagedAgentsAnthropicSkillType` - `const BetaManagedAgentsAnthropicSkillTypeAnthropic BetaManagedAgentsAnthropicSkillType = "anthropic"` - `Version string` - `type BetaManagedAgentsCustomSkill struct{…}` A resolved user-created custom skill. - `SkillID string` - `Type BetaManagedAgentsCustomSkillType` - `const BetaManagedAgentsCustomSkillTypeCustom BetaManagedAgentsCustomSkillType = "custom"` - `Version string` - `System string` - `Tools []BetaManagedAgentsSessionThreadAgentToolUnion` - `type BetaManagedAgentsAgentToolset20260401 struct{…}` - `Configs []BetaManagedAgentsAgentToolConfig` - `Enabled bool` - `Name BetaManagedAgentsAgentToolConfigName` Built-in agent tool identifier. - `const BetaManagedAgentsAgentToolConfigNameBash BetaManagedAgentsAgentToolConfigName = "bash"` - `const BetaManagedAgentsAgentToolConfigNameEdit BetaManagedAgentsAgentToolConfigName = "edit"` - `const BetaManagedAgentsAgentToolConfigNameRead BetaManagedAgentsAgentToolConfigName = "read"` - `const BetaManagedAgentsAgentToolConfigNameWrite BetaManagedAgentsAgentToolConfigName = "write"` - `const BetaManagedAgentsAgentToolConfigNameGlob BetaManagedAgentsAgentToolConfigName = "glob"` - `const BetaManagedAgentsAgentToolConfigNameGrep BetaManagedAgentsAgentToolConfigName = "grep"` - `const BetaManagedAgentsAgentToolConfigNameWebFetch BetaManagedAgentsAgentToolConfigName = "web_fetch"` - `const BetaManagedAgentsAgentToolConfigNameWebSearch BetaManagedAgentsAgentToolConfigName = "web_search"` - `PermissionPolicy BetaManagedAgentsAgentToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy struct{…}` Tool calls are automatically approved without user confirmation. - `Type BetaManagedAgentsAlwaysAllowPolicyType` - `const BetaManagedAgentsAlwaysAllowPolicyTypeAlwaysAllow BetaManagedAgentsAlwaysAllowPolicyType = "always_allow"` - `type BetaManagedAgentsAlwaysAskPolicy struct{…}` Tool calls require user confirmation before execution. - `Type BetaManagedAgentsAlwaysAskPolicyType` - `const BetaManagedAgentsAlwaysAskPolicyTypeAlwaysAsk BetaManagedAgentsAlwaysAskPolicyType = "always_ask"` - `DefaultConfig BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `Enabled bool` - `PermissionPolicy BetaManagedAgentsAgentToolsetDefaultConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy struct{…}` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy struct{…}` Tool calls require user confirmation before execution. - `Type BetaManagedAgentsAgentToolset20260401Type` - `const BetaManagedAgentsAgentToolset20260401TypeAgentToolset20260401 BetaManagedAgentsAgentToolset20260401Type = "agent_toolset_20260401"` - `type BetaManagedAgentsMCPToolset struct{…}` - `Configs []BetaManagedAgentsMCPToolConfig` - `Enabled bool` - `Name string` - `PermissionPolicy BetaManagedAgentsMCPToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy struct{…}` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy struct{…}` Tool calls require user confirmation before execution. - `DefaultConfig BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `Enabled bool` - `PermissionPolicy BetaManagedAgentsMCPToolsetDefaultConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy struct{…}` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy struct{…}` Tool calls require user confirmation before execution. - `MCPServerName string` - `Type BetaManagedAgentsMCPToolsetType` - `const BetaManagedAgentsMCPToolsetTypeMCPToolset BetaManagedAgentsMCPToolsetType = "mcp_toolset"` - `type BetaManagedAgentsCustomTool struct{…}` A custom tool as returned in API responses. - `Description string` - `InputSchema BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `Properties map[string, any]` JSON Schema properties defining the tool's input parameters. - `Required []string` List of required property names. - `Type BetaManagedAgentsCustomToolInputSchemaType` Must be 'object' for tool input schemas. - `const BetaManagedAgentsCustomToolInputSchemaTypeObject BetaManagedAgentsCustomToolInputSchemaType = "object"` - `Name string` - `Type BetaManagedAgentsCustomToolType` - `const BetaManagedAgentsCustomToolTypeCustom BetaManagedAgentsCustomToolType = "custom"` - `Type BetaManagedAgentsSessionThreadAgentType` - `const BetaManagedAgentsSessionThreadAgentTypeAgent BetaManagedAgentsSessionThreadAgentType = "agent"` - `Version int64` - `Type BetaManagedAgentsSessionMultiagentCoordinatorType` - `const BetaManagedAgentsSessionMultiagentCoordinatorTypeCoordinator BetaManagedAgentsSessionMultiagentCoordinatorType = "coordinator"` - `Name string` - `Skills []BetaManagedAgentsSessionAgentSkillUnion` - `type BetaManagedAgentsAnthropicSkill struct{…}` A resolved Anthropic-managed skill. - `type BetaManagedAgentsCustomSkill struct{…}` A resolved user-created custom skill. - `System string` - `Tools []BetaManagedAgentsSessionAgentToolUnion` - `type BetaManagedAgentsAgentToolset20260401 struct{…}` - `type BetaManagedAgentsMCPToolset struct{…}` - `type BetaManagedAgentsCustomTool struct{…}` A custom tool as returned in API responses. - `Type BetaManagedAgentsSessionAgentType` - `const BetaManagedAgentsSessionAgentTypeAgent BetaManagedAgentsSessionAgentType = "agent"` - `Version int64` - `Metadata map[string, 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 ```go package main import ( "context" "fmt" "github.com/anthropics/anthropic-sdk-go" "github.com/anthropics/anthropic-sdk-go/option" ) func main() { client := anthropic.NewClient( option.WithAPIKey("my-anthropic-api-key"), ) page, err := client.Beta.Sessions.Threads.Events.List( context.TODO(), "sthr_011CZkZVWa6oIjw0rgXZpnBt", anthropic.BetaSessionThreadEventListParams{ SessionID: "sesn_011CZkZAtmR3yMPDzynEDxu7", }, ) if err != nil { panic(err.Error()) } fmt.Printf("%+v\n", 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 `client.Beta.Sessions.Threads.Events.Stream(ctx, threadID, params) (*BetaManagedAgentsStreamSessionThreadEventsUnion, error)` **get** `/v1/sessions/{session_id}/threads/{thread_id}/stream` Stream Session Thread Events ### Parameters - `threadID string` - `params BetaSessionThreadEventStreamParams` - `SessionID param.Field[string]` Path param: Path parameter session_id - `Betas param.Field[[]AnthropicBeta]` Header param: Optional header to specify the beta version(s) you want to use. - `string` - `type AnthropicBeta string` - `const AnthropicBetaMessageBatches2024_09_24 AnthropicBeta = "message-batches-2024-09-24"` - `const AnthropicBetaPromptCaching2024_07_31 AnthropicBeta = "prompt-caching-2024-07-31"` - `const AnthropicBetaComputerUse2024_10_22 AnthropicBeta = "computer-use-2024-10-22"` - `const AnthropicBetaComputerUse2025_01_24 AnthropicBeta = "computer-use-2025-01-24"` - `const AnthropicBetaPDFs2024_09_25 AnthropicBeta = "pdfs-2024-09-25"` - `const AnthropicBetaTokenCounting2024_11_01 AnthropicBeta = "token-counting-2024-11-01"` - `const AnthropicBetaTokenEfficientTools2025_02_19 AnthropicBeta = "token-efficient-tools-2025-02-19"` - `const AnthropicBetaOutput128k2025_02_19 AnthropicBeta = "output-128k-2025-02-19"` - `const AnthropicBetaFilesAPI2025_04_14 AnthropicBeta = "files-api-2025-04-14"` - `const AnthropicBetaMCPClient2025_04_04 AnthropicBeta = "mcp-client-2025-04-04"` - `const AnthropicBetaMCPClient2025_11_20 AnthropicBeta = "mcp-client-2025-11-20"` - `const AnthropicBetaDevFullThinking2025_05_14 AnthropicBeta = "dev-full-thinking-2025-05-14"` - `const AnthropicBetaInterleavedThinking2025_05_14 AnthropicBeta = "interleaved-thinking-2025-05-14"` - `const AnthropicBetaCodeExecution2025_05_22 AnthropicBeta = "code-execution-2025-05-22"` - `const AnthropicBetaExtendedCacheTTL2025_04_11 AnthropicBeta = "extended-cache-ttl-2025-04-11"` - `const AnthropicBetaContext1m2025_08_07 AnthropicBeta = "context-1m-2025-08-07"` - `const AnthropicBetaContextManagement2025_06_27 AnthropicBeta = "context-management-2025-06-27"` - `const AnthropicBetaModelContextWindowExceeded2025_08_26 AnthropicBeta = "model-context-window-exceeded-2025-08-26"` - `const AnthropicBetaSkills2025_10_02 AnthropicBeta = "skills-2025-10-02"` - `const AnthropicBetaFastMode2026_02_01 AnthropicBeta = "fast-mode-2026-02-01"` - `const AnthropicBetaOutput300k2026_03_24 AnthropicBeta = "output-300k-2026-03-24"` - `const AnthropicBetaUserProfiles2026_03_24 AnthropicBeta = "user-profiles-2026-03-24"` - `const AnthropicBetaAdvisorTool2026_03_01 AnthropicBeta = "advisor-tool-2026-03-01"` - `const AnthropicBetaManagedAgents2026_04_01 AnthropicBeta = "managed-agents-2026-04-01"` - `const AnthropicBetaCacheDiagnosis2026_04_07 AnthropicBeta = "cache-diagnosis-2026-04-07"` - `const AnthropicBetaThinkingTokenCount2026_05_13 AnthropicBeta = "thinking-token-count-2026-05-13"` ### Returns - `type BetaManagedAgentsStreamSessionThreadEventsUnion interface{…}` Server-sent event in a single thread's stream. - `type BetaManagedAgentsUserMessageEvent struct{…}` A user message event in the session conversation. - `ID string` Unique identifier for this event. - `Content []BetaManagedAgentsUserMessageEventContentUnion` Array of content blocks comprising the user message. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `Text string` The text content. - `Type BetaManagedAgentsTextBlockType` - `const BetaManagedAgentsTextBlockTypeText BetaManagedAgentsTextBlockType = "text"` - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `Source BetaManagedAgentsImageBlockSourceUnion` Union type for image source variants. - `type BetaManagedAgentsBase64ImageSource struct{…}` Base64-encoded image data. - `Data string` Base64-encoded image data. - `MediaType string` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `Type BetaManagedAgentsBase64ImageSourceType` - `const BetaManagedAgentsBase64ImageSourceTypeBase64 BetaManagedAgentsBase64ImageSourceType = "base64"` - `type BetaManagedAgentsURLImageSource struct{…}` Image referenced by URL. - `Type BetaManagedAgentsURLImageSourceType` - `const BetaManagedAgentsURLImageSourceTypeURL BetaManagedAgentsURLImageSourceType = "url"` - `URL string` URL of the image to fetch. - `type BetaManagedAgentsFileImageSource struct{…}` Image referenced by file ID. - `FileID string` ID of a previously uploaded file. - `Type BetaManagedAgentsFileImageSourceType` - `const BetaManagedAgentsFileImageSourceTypeFile BetaManagedAgentsFileImageSourceType = "file"` - `Type BetaManagedAgentsImageBlockType` - `const BetaManagedAgentsImageBlockTypeImage BetaManagedAgentsImageBlockType = "image"` - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `Source BetaManagedAgentsDocumentBlockSourceUnion` Union type for document source variants. - `type BetaManagedAgentsBase64DocumentSource struct{…}` Base64-encoded document data. - `Data string` Base64-encoded document data. - `MediaType string` MIME type of the document (e.g., "application/pdf"). - `Type BetaManagedAgentsBase64DocumentSourceType` - `const BetaManagedAgentsBase64DocumentSourceTypeBase64 BetaManagedAgentsBase64DocumentSourceType = "base64"` - `type BetaManagedAgentsPlainTextDocumentSource struct{…}` Plain text document content. - `Data string` The plain text content. - `MediaType BetaManagedAgentsPlainTextDocumentSourceMediaType` MIME type of the text content. Must be "text/plain". - `const BetaManagedAgentsPlainTextDocumentSourceMediaTypeTextPlain BetaManagedAgentsPlainTextDocumentSourceMediaType = "text/plain"` - `Type BetaManagedAgentsPlainTextDocumentSourceType` - `const BetaManagedAgentsPlainTextDocumentSourceTypeText BetaManagedAgentsPlainTextDocumentSourceType = "text"` - `type BetaManagedAgentsURLDocumentSource struct{…}` Document referenced by URL. - `Type BetaManagedAgentsURLDocumentSourceType` - `const BetaManagedAgentsURLDocumentSourceTypeURL BetaManagedAgentsURLDocumentSourceType = "url"` - `URL string` URL of the document to fetch. - `type BetaManagedAgentsFileDocumentSource struct{…}` Document referenced by file ID. - `FileID string` ID of a previously uploaded file. - `Type BetaManagedAgentsFileDocumentSourceType` - `const BetaManagedAgentsFileDocumentSourceTypeFile BetaManagedAgentsFileDocumentSourceType = "file"` - `Type BetaManagedAgentsDocumentBlockType` - `const BetaManagedAgentsDocumentBlockTypeDocument BetaManagedAgentsDocumentBlockType = "document"` - `Context string` Additional context about the document for the model. - `Title string` The title of the document. - `Type BetaManagedAgentsUserMessageEventType` - `const BetaManagedAgentsUserMessageEventTypeUserMessage BetaManagedAgentsUserMessageEventType = "user.message"` - `ProcessedAt Time` A timestamp in RFC 3339 format - `type BetaManagedAgentsUserInterruptEvent struct{…}` An interrupt event that pauses agent execution and returns control to the user. - `ID string` Unique identifier for this event. - `Type BetaManagedAgentsUserInterruptEventType` - `const BetaManagedAgentsUserInterruptEventTypeUserInterrupt BetaManagedAgentsUserInterruptEventType = "user.interrupt"` - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID 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. - `type BetaManagedAgentsUserToolConfirmationEvent struct{…}` A tool confirmation event that approves or denies a pending tool execution. - `ID string` Unique identifier for this event. - `Result BetaManagedAgentsUserToolConfirmationEventResult` UserToolConfirmationResult enum - `const BetaManagedAgentsUserToolConfirmationEventResultAllow BetaManagedAgentsUserToolConfirmationEventResult = "allow"` - `const BetaManagedAgentsUserToolConfirmationEventResultDeny BetaManagedAgentsUserToolConfirmationEventResult = "deny"` - `ToolUseID 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 BetaManagedAgentsUserToolConfirmationEventType` - `const BetaManagedAgentsUserToolConfirmationEventTypeUserToolConfirmation BetaManagedAgentsUserToolConfirmationEventType = "user.tool_confirmation"` - `DenyMessage string` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID 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. - `type BetaManagedAgentsUserCustomToolResultEvent struct{…}` Event sent by the client providing the result of a custom tool execution. - `ID string` Unique identifier for this event. - `CustomToolUseID 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 BetaManagedAgentsUserCustomToolResultEventType` - `const BetaManagedAgentsUserCustomToolResultEventTypeUserCustomToolResult BetaManagedAgentsUserCustomToolResultEventType = "user.custom_tool_result"` - `Content []BetaManagedAgentsUserCustomToolResultEventContentUnion` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` 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 []BetaManagedAgentsSearchResultContent` Array of text content blocks from the search result. - `Text string` The text content. - `Type BetaManagedAgentsSearchResultContentType` - `const BetaManagedAgentsSearchResultContentTypeText BetaManagedAgentsSearchResultContentType = "text"` - `Source string` The URL source of the search result. - `Title string` The title of the search result. - `Type BetaManagedAgentsSearchResultBlockType` - `const BetaManagedAgentsSearchResultBlockTypeSearchResult BetaManagedAgentsSearchResultBlockType = "search_result"` - `IsError bool` Whether the tool execution resulted in an error. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `type BetaManagedAgentsAgentCustomToolUseEvent struct{…}` 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 map[string, any]` Input parameters for the tool call. - `Name string` Name of the custom tool being called. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentCustomToolUseEventType` - `const BetaManagedAgentsAgentCustomToolUseEventTypeAgentCustomToolUse BetaManagedAgentsAgentCustomToolUseEventType = "agent.custom_tool_use"` - `SessionThreadID 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. - `type BetaManagedAgentsAgentMessageEvent struct{…}` An agent response event in the session conversation. - `ID string` Unique identifier for this event. - `Content []BetaManagedAgentsTextBlock` Array of text blocks comprising the agent response. - `Text string` The text content. - `Type BetaManagedAgentsTextBlockType` - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentMessageEventType` - `const BetaManagedAgentsAgentMessageEventTypeAgentMessage BetaManagedAgentsAgentMessageEventType = "agent.message"` - `type BetaManagedAgentsAgentThinkingEvent struct{…}` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentThinkingEventType` - `const BetaManagedAgentsAgentThinkingEventTypeAgentThinking BetaManagedAgentsAgentThinkingEventType = "agent.thinking"` - `type BetaManagedAgentsAgentMCPToolUseEvent struct{…}` Event emitted when the agent invokes a tool provided by an MCP server. - `ID string` Unique identifier for this event. - `Input map[string, any]` Input parameters for the tool call. - `MCPServerName string` Name of the MCP server providing the tool. - `Name string` Name of the MCP tool being used. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentMCPToolUseEventType` - `const BetaManagedAgentsAgentMCPToolUseEventTypeAgentMCPToolUse BetaManagedAgentsAgentMCPToolUseEventType = "agent.mcp_tool_use"` - `EvaluatedPermission BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermission` AgentEvaluatedPermission enum - `const BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermissionAllow BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermission = "allow"` - `const BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermissionAsk BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermission = "ask"` - `const BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermissionDeny BetaManagedAgentsAgentMCPToolUseEventEvaluatedPermission = "deny"` - `SessionThreadID 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. - `type BetaManagedAgentsAgentMCPToolResultEvent struct{…}` Event representing the result of an MCP tool execution. - `ID string` Unique identifier for this event. - `MCPToolUseID string` The id of the `agent.mcp_tool_use` event this result corresponds to. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentMCPToolResultEventType` - `const BetaManagedAgentsAgentMCPToolResultEventTypeAgentMCPToolResult BetaManagedAgentsAgentMCPToolResultEventType = "agent.mcp_tool_result"` - `Content []BetaManagedAgentsAgentMCPToolResultEventContentUnion` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` A block containing a web search result. - `IsError bool` Whether the tool execution resulted in an error. - `type BetaManagedAgentsAgentToolUseEvent struct{…}` Event emitted when the agent invokes a built-in agent tool. - `ID string` Unique identifier for this event. - `Input map[string, any]` Input parameters for the tool call. - `Name string` Name of the agent tool being used. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentToolUseEventType` - `const BetaManagedAgentsAgentToolUseEventTypeAgentToolUse BetaManagedAgentsAgentToolUseEventType = "agent.tool_use"` - `EvaluatedPermission BetaManagedAgentsAgentToolUseEventEvaluatedPermission` AgentEvaluatedPermission enum - `const BetaManagedAgentsAgentToolUseEventEvaluatedPermissionAllow BetaManagedAgentsAgentToolUseEventEvaluatedPermission = "allow"` - `const BetaManagedAgentsAgentToolUseEventEvaluatedPermissionAsk BetaManagedAgentsAgentToolUseEventEvaluatedPermission = "ask"` - `const BetaManagedAgentsAgentToolUseEventEvaluatedPermissionDeny BetaManagedAgentsAgentToolUseEventEvaluatedPermission = "deny"` - `SessionThreadID 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. - `type BetaManagedAgentsAgentToolResultEvent struct{…}` Event representing the result of an agent tool execution. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `ToolUseID string` The id of the `agent.tool_use` event this result corresponds to. - `Type BetaManagedAgentsAgentToolResultEventType` - `const BetaManagedAgentsAgentToolResultEventTypeAgentToolResult BetaManagedAgentsAgentToolResultEventType = "agent.tool_result"` - `Content []BetaManagedAgentsAgentToolResultEventContentUnion` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` A block containing a web search result. - `IsError bool` Whether the tool execution resulted in an error. - `type BetaManagedAgentsAgentThreadMessageReceivedEvent struct{…}` 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 []BetaManagedAgentsAgentThreadMessageReceivedEventContentUnion` Message content blocks. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `FromSessionThreadID string` Public `sthr_` ID of the thread that sent the message. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentThreadMessageReceivedEventType` - `const BetaManagedAgentsAgentThreadMessageReceivedEventTypeAgentThreadMessageReceived BetaManagedAgentsAgentThreadMessageReceivedEventType = "agent.thread_message_received"` - `FromAgentName string` Name of the callable agent this message came from. Absent when received from the primary agent. - `type BetaManagedAgentsAgentThreadMessageSentEvent struct{…}` 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 []BetaManagedAgentsAgentThreadMessageSentEventContentUnion` Message content blocks. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `ProcessedAt Time` A timestamp in RFC 3339 format - `ToSessionThreadID string` Public `sthr_` ID of the thread the message was sent to. - `Type BetaManagedAgentsAgentThreadMessageSentEventType` - `const BetaManagedAgentsAgentThreadMessageSentEventTypeAgentThreadMessageSent BetaManagedAgentsAgentThreadMessageSentEventType = "agent.thread_message_sent"` - `ToAgentName string` Name of the callable agent this message was sent to. Absent when sent to the primary agent. - `type BetaManagedAgentsAgentThreadContextCompactedEvent struct{…}` Indicates that context compaction (summarization) occurred during the session. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsAgentThreadContextCompactedEventType` - `const BetaManagedAgentsAgentThreadContextCompactedEventTypeAgentThreadContextCompacted BetaManagedAgentsAgentThreadContextCompactedEventType = "agent.thread_context_compacted"` - `type BetaManagedAgentsSessionErrorEvent struct{…}` An error event indicating a problem occurred during session execution. - `ID string` Unique identifier for this event. - `Error BetaManagedAgentsSessionErrorEventErrorUnion` An unknown or unexpected error occurred during session execution. A fallback variant; clients that don't recognize a new error code can match on `retry_status` and `message` alone. - `type BetaManagedAgentsUnknownError struct{…}` 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. - `RetryStatus BetaManagedAgentsUnknownErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusRetryingType` - `const BetaManagedAgentsRetryStatusRetryingTypeRetrying BetaManagedAgentsRetryStatusRetryingType = "retrying"` - `type BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `Type BetaManagedAgentsRetryStatusExhaustedType` - `const BetaManagedAgentsRetryStatusExhaustedTypeExhausted BetaManagedAgentsRetryStatusExhaustedType = "exhausted"` - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsRetryStatusTerminalType` - `const BetaManagedAgentsRetryStatusTerminalTypeTerminal BetaManagedAgentsRetryStatusTerminalType = "terminal"` - `Type BetaManagedAgentsUnknownErrorType` - `const BetaManagedAgentsUnknownErrorTypeUnknownError BetaManagedAgentsUnknownErrorType = "unknown_error"` - `type BetaManagedAgentsModelOverloadedError struct{…}` The model is currently overloaded. Emitted after automatic retries are exhausted. - `Message string` Human-readable error description. - `RetryStatus BetaManagedAgentsModelOverloadedErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsModelOverloadedErrorType` - `const BetaManagedAgentsModelOverloadedErrorTypeModelOverloadedError BetaManagedAgentsModelOverloadedErrorType = "model_overloaded_error"` - `type BetaManagedAgentsModelRateLimitedError struct{…}` The model request was rate-limited. - `Message string` Human-readable error description. - `RetryStatus BetaManagedAgentsModelRateLimitedErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsModelRateLimitedErrorType` - `const BetaManagedAgentsModelRateLimitedErrorTypeModelRateLimitedError BetaManagedAgentsModelRateLimitedErrorType = "model_rate_limited_error"` - `type BetaManagedAgentsModelRequestFailedError struct{…}` A model request failed for a reason other than overload or rate-limiting. - `Message string` Human-readable error description. - `RetryStatus BetaManagedAgentsModelRequestFailedErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsModelRequestFailedErrorType` - `const BetaManagedAgentsModelRequestFailedErrorTypeModelRequestFailedError BetaManagedAgentsModelRequestFailedErrorType = "model_request_failed_error"` - `type BetaManagedAgentsMCPConnectionFailedError struct{…}` Failed to connect to an MCP server. - `MCPServerName string` Name of the MCP server that failed to connect. - `Message string` Human-readable error description. - `RetryStatus BetaManagedAgentsMCPConnectionFailedErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsMCPConnectionFailedErrorType` - `const BetaManagedAgentsMCPConnectionFailedErrorTypeMCPConnectionFailedError BetaManagedAgentsMCPConnectionFailedErrorType = "mcp_connection_failed_error"` - `type BetaManagedAgentsMCPAuthenticationFailedError struct{…}` Authentication to an MCP server failed. - `MCPServerName string` Name of the MCP server that failed authentication. - `Message string` Human-readable error description. - `RetryStatus BetaManagedAgentsMCPAuthenticationFailedErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsMCPAuthenticationFailedErrorType` - `const BetaManagedAgentsMCPAuthenticationFailedErrorTypeMCPAuthenticationFailedError BetaManagedAgentsMCPAuthenticationFailedErrorType = "mcp_authentication_failed_error"` - `type BetaManagedAgentsBillingError struct{…}` 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. - `RetryStatus BetaManagedAgentsBillingErrorRetryStatusUnion` What the client should do next in response to this error. - `type BetaManagedAgentsRetryStatusRetrying struct{…}` 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 BetaManagedAgentsRetryStatusExhausted struct{…}` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `type BetaManagedAgentsRetryStatusTerminal struct{…}` The session encountered a terminal error and will transition to `terminated` state. - `Type BetaManagedAgentsBillingErrorType` - `const BetaManagedAgentsBillingErrorTypeBillingError BetaManagedAgentsBillingErrorType = "billing_error"` - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionErrorEventType` - `const BetaManagedAgentsSessionErrorEventTypeSessionError BetaManagedAgentsSessionErrorEventType = "session.error"` - `type BetaManagedAgentsSessionStatusRescheduledEvent struct{…}` Indicates the session is recovering from an error state and is rescheduled for execution. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionStatusRescheduledEventType` - `const BetaManagedAgentsSessionStatusRescheduledEventTypeSessionStatusRescheduled BetaManagedAgentsSessionStatusRescheduledEventType = "session.status_rescheduled"` - `type BetaManagedAgentsSessionStatusRunningEvent struct{…}` Indicates the session is actively running and the agent is working. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionStatusRunningEventType` - `const BetaManagedAgentsSessionStatusRunningEventTypeSessionStatusRunning BetaManagedAgentsSessionStatusRunningEventType = "session.status_running"` - `type BetaManagedAgentsSessionStatusIdleEvent struct{…}` Indicates the agent has paused and is awaiting user input. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `StopReason BetaManagedAgentsSessionStatusIdleEventStopReasonUnion` The agent completed its turn naturally and is ready for the next user message. - `type BetaManagedAgentsSessionEndTurn struct{…}` The agent completed its turn naturally and is ready for the next user message. - `Type BetaManagedAgentsSessionEndTurnType` - `const BetaManagedAgentsSessionEndTurnTypeEndTurn BetaManagedAgentsSessionEndTurnType = "end_turn"` - `type BetaManagedAgentsSessionRequiresAction struct{…}` 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. - `EventIDs []string` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `Type BetaManagedAgentsSessionRequiresActionType` - `const BetaManagedAgentsSessionRequiresActionTypeRequiresAction BetaManagedAgentsSessionRequiresActionType = "requires_action"` - `type BetaManagedAgentsSessionRetriesExhausted struct{…}` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `Type BetaManagedAgentsSessionRetriesExhaustedType` - `const BetaManagedAgentsSessionRetriesExhaustedTypeRetriesExhausted BetaManagedAgentsSessionRetriesExhaustedType = "retries_exhausted"` - `Type BetaManagedAgentsSessionStatusIdleEventType` - `const BetaManagedAgentsSessionStatusIdleEventTypeSessionStatusIdle BetaManagedAgentsSessionStatusIdleEventType = "session.status_idle"` - `type BetaManagedAgentsSessionStatusTerminatedEvent struct{…}` Indicates the session has terminated, either due to an error or completion. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionStatusTerminatedEventType` - `const BetaManagedAgentsSessionStatusTerminatedEventTypeSessionStatusTerminated BetaManagedAgentsSessionStatusTerminatedEventType = "session.status_terminated"` - `type BetaManagedAgentsSessionThreadCreatedEvent struct{…}` 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. - `AgentName string` Name of the callable agent the thread runs. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Public `sthr_` ID of the newly created thread. - `Type BetaManagedAgentsSessionThreadCreatedEventType` - `const BetaManagedAgentsSessionThreadCreatedEventTypeSessionThreadCreated BetaManagedAgentsSessionThreadCreatedEventType = "session.thread_created"` - `type BetaManagedAgentsSpanOutcomeEvaluationStartEvent struct{…}` Emitted when an outcome evaluation cycle begins. - `ID string` Unique identifier for this event. - `Iteration int64` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `OutcomeID string` The `outc_` ID of the outcome being evaluated. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSpanOutcomeEvaluationStartEventType` - `const BetaManagedAgentsSpanOutcomeEvaluationStartEventTypeSpanOutcomeEvaluationStart BetaManagedAgentsSpanOutcomeEvaluationStartEventType = "span.outcome_evaluation_start"` - `type BetaManagedAgentsSpanOutcomeEvaluationEndEvent struct{…}` 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 int64` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `OutcomeEvaluationStartID string` The id of the corresponding `span.outcome_evaluation_start` event. - `OutcomeID string` The `outc_` ID of the outcome being evaluated. - `ProcessedAt 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 BetaManagedAgentsSpanOutcomeEvaluationEndEventType` - `const BetaManagedAgentsSpanOutcomeEvaluationEndEventTypeSpanOutcomeEvaluationEnd BetaManagedAgentsSpanOutcomeEvaluationEndEventType = "span.outcome_evaluation_end"` - `Usage BetaManagedAgentsSpanModelUsage` Token usage for a single model request. - `CacheCreationInputTokens int64` Tokens used to create prompt cache in this request. - `CacheReadInputTokens int64` Tokens read from prompt cache in this request. - `InputTokens int64` Input tokens consumed by this request. - `OutputTokens int64` Output tokens generated by this request. - `Speed BetaManagedAgentsSpanModelUsageSpeed` 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. - `const BetaManagedAgentsSpanModelUsageSpeedStandard BetaManagedAgentsSpanModelUsageSpeed = "standard"` - `const BetaManagedAgentsSpanModelUsageSpeedFast BetaManagedAgentsSpanModelUsageSpeed = "fast"` - `type BetaManagedAgentsSpanModelRequestStartEvent struct{…}` Emitted when a model request is initiated by the agent. - `ID string` Unique identifier for this event. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSpanModelRequestStartEventType` - `const BetaManagedAgentsSpanModelRequestStartEventTypeSpanModelRequestStart BetaManagedAgentsSpanModelRequestStartEventType = "span.model_request_start"` - `type BetaManagedAgentsSpanModelRequestEndEvent struct{…}` Emitted when a model request completes. - `ID string` Unique identifier for this event. - `IsError bool` Whether the model request resulted in an error. - `ModelRequestStartID string` The id of the corresponding `span.model_request_start` event. - `ModelUsage BetaManagedAgentsSpanModelUsage` Token usage for a single model request. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSpanModelRequestEndEventType` - `const BetaManagedAgentsSpanModelRequestEndEventTypeSpanModelRequestEnd BetaManagedAgentsSpanModelRequestEndEventType = "span.model_request_end"` - `type BetaManagedAgentsSpanOutcomeEvaluationOngoingEvent struct{…}` 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 int64` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `OutcomeID string` The `outc_` ID of the outcome being evaluated. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSpanOutcomeEvaluationOngoingEventType` - `const BetaManagedAgentsSpanOutcomeEvaluationOngoingEventTypeSpanOutcomeEvaluationOngoing BetaManagedAgentsSpanOutcomeEvaluationOngoingEventType = "span.outcome_evaluation_ongoing"` - `type BetaManagedAgentsUserDefineOutcomeEvent struct{…}` 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. - `MaxIterations int64` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `OutcomeID string` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Rubric BetaManagedAgentsUserDefineOutcomeEventRubricUnion` Rubric for grading the quality of an outcome. - `type BetaManagedAgentsFileRubric struct{…}` Rubric referenced by a file uploaded via the Files API. - `FileID string` ID of the rubric file. - `Type BetaManagedAgentsFileRubricType` - `const BetaManagedAgentsFileRubricTypeFile BetaManagedAgentsFileRubricType = "file"` - `type BetaManagedAgentsTextRubric struct{…}` Rubric content provided inline as text. - `Content string` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `Type BetaManagedAgentsTextRubricType` - `const BetaManagedAgentsTextRubricTypeText BetaManagedAgentsTextRubricType = "text"` - `Type BetaManagedAgentsUserDefineOutcomeEventType` - `const BetaManagedAgentsUserDefineOutcomeEventTypeUserDefineOutcome BetaManagedAgentsUserDefineOutcomeEventType = "user.define_outcome"` - `type BetaManagedAgentsSessionDeletedEvent struct{…}` 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. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionDeletedEventType` - `const BetaManagedAgentsSessionDeletedEventTypeSessionDeleted BetaManagedAgentsSessionDeletedEventType = "session.deleted"` - `type BetaManagedAgentsSessionThreadStatusRunningEvent struct{…}` 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. - `AgentName string` Name of the agent the thread runs. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Public sthr_ ID of the thread that started running. - `Type BetaManagedAgentsSessionThreadStatusRunningEventType` - `const BetaManagedAgentsSessionThreadStatusRunningEventTypeSessionThreadStatusRunning BetaManagedAgentsSessionThreadStatusRunningEventType = "session.thread_status_running"` - `type BetaManagedAgentsSessionThreadStatusIdleEvent struct{…}` 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. - `AgentName string` Name of the agent the thread runs. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Public sthr_ ID of the thread that went idle. - `StopReason BetaManagedAgentsSessionThreadStatusIdleEventStopReasonUnion` The agent completed its turn naturally and is ready for the next user message. - `type BetaManagedAgentsSessionEndTurn struct{…}` The agent completed its turn naturally and is ready for the next user message. - `type BetaManagedAgentsSessionRequiresAction struct{…}` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `type BetaManagedAgentsSessionRetriesExhausted struct{…}` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `Type BetaManagedAgentsSessionThreadStatusIdleEventType` - `const BetaManagedAgentsSessionThreadStatusIdleEventTypeSessionThreadStatusIdle BetaManagedAgentsSessionThreadStatusIdleEventType = "session.thread_status_idle"` - `type BetaManagedAgentsSessionThreadStatusTerminatedEvent struct{…}` 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. - `AgentName string` Name of the agent the thread runs. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Public sthr_ ID of the thread that terminated. - `Type BetaManagedAgentsSessionThreadStatusTerminatedEventType` - `const BetaManagedAgentsSessionThreadStatusTerminatedEventTypeSessionThreadStatusTerminated BetaManagedAgentsSessionThreadStatusTerminatedEventType = "session.thread_status_terminated"` - `type BetaManagedAgentsUserToolResultEvent struct{…}` 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. - `ToolUseID 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 BetaManagedAgentsUserToolResultEventType` - `const BetaManagedAgentsUserToolResultEventTypeUserToolResult BetaManagedAgentsUserToolResultEventType = "user.tool_result"` - `Content []BetaManagedAgentsUserToolResultEventContentUnion` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` A block containing a web search result. - `IsError bool` Whether the tool execution resulted in an error. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `type BetaManagedAgentsSessionThreadStatusRescheduledEvent struct{…}` 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. - `AgentName string` Name of the agent the thread runs. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Public sthr_ ID of the thread that is retrying. - `Type BetaManagedAgentsSessionThreadStatusRescheduledEventType` - `const BetaManagedAgentsSessionThreadStatusRescheduledEventTypeSessionThreadStatusRescheduled BetaManagedAgentsSessionThreadStatusRescheduledEventType = "session.thread_status_rescheduled"` - `type BetaManagedAgentsSessionUpdatedEvent struct{…}` 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. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Type BetaManagedAgentsSessionUpdatedEventType` - `const BetaManagedAgentsSessionUpdatedEventTypeSessionUpdated BetaManagedAgentsSessionUpdatedEventType = "session.updated"` - `Agent BetaManagedAgentsSessionAgent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `ID string` - `Description string` - `MCPServers []BetaManagedAgentsMCPServerURLDefinition` - `Name string` - `Type BetaManagedAgentsMCPServerURLDefinitionType` - `const BetaManagedAgentsMCPServerURLDefinitionTypeURL BetaManagedAgentsMCPServerURLDefinitionType = "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. - `type BetaManagedAgentsModel string` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `const BetaManagedAgentsModelClaudeOpus4_8 BetaManagedAgentsModel = "claude-opus-4-8"` Frontier intelligence for long-running agents and coding - `const BetaManagedAgentsModelClaudeOpus4_7 BetaManagedAgentsModel = "claude-opus-4-7"` Frontier intelligence for long-running agents and coding - `const BetaManagedAgentsModelClaudeOpus4_6 BetaManagedAgentsModel = "claude-opus-4-6"` Most intelligent model for building agents and coding - `const BetaManagedAgentsModelClaudeSonnet4_6 BetaManagedAgentsModel = "claude-sonnet-4-6"` Best combination of speed and intelligence - `const BetaManagedAgentsModelClaudeHaiku4_5 BetaManagedAgentsModel = "claude-haiku-4-5"` Fastest model with near-frontier intelligence - `const BetaManagedAgentsModelClaudeHaiku4_5_20251001 BetaManagedAgentsModel = "claude-haiku-4-5-20251001"` Fastest model with near-frontier intelligence - `const BetaManagedAgentsModelClaudeOpus4_5 BetaManagedAgentsModel = "claude-opus-4-5"` Premium model combining maximum intelligence with practical performance - `const BetaManagedAgentsModelClaudeOpus4_5_20251101 BetaManagedAgentsModel = "claude-opus-4-5-20251101"` Premium model combining maximum intelligence with practical performance - `const BetaManagedAgentsModelClaudeSonnet4_5 BetaManagedAgentsModel = "claude-sonnet-4-5"` High-performance model for agents and coding - `const BetaManagedAgentsModelClaudeSonnet4_5_20250929 BetaManagedAgentsModel = "claude-sonnet-4-5-20250929"` High-performance model for agents and coding - `string` - `Speed BetaManagedAgentsModelConfigSpeed` 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. - `const BetaManagedAgentsModelConfigSpeedStandard BetaManagedAgentsModelConfigSpeed = "standard"` - `const BetaManagedAgentsModelConfigSpeedFast BetaManagedAgentsModelConfigSpeed = "fast"` - `Multiagent BetaManagedAgentsSessionMultiagentCoordinator` Resolved coordinator topology with full agent definitions for each roster member. - `Agents []BetaManagedAgentsSessionThreadAgent` Full `agent` definitions the coordinator may spawn as session threads. - `ID string` - `Description string` - `MCPServers []BetaManagedAgentsMCPServerURLDefinition` - `Name string` - `Type BetaManagedAgentsMCPServerURLDefinitionType` - `URL string` - `Model BetaManagedAgentsModelConfig` Model identifier and configuration. - `Name string` - `Skills []BetaManagedAgentsSessionThreadAgentSkillUnion` - `type BetaManagedAgentsAnthropicSkill struct{…}` A resolved Anthropic-managed skill. - `SkillID string` - `Type BetaManagedAgentsAnthropicSkillType` - `const BetaManagedAgentsAnthropicSkillTypeAnthropic BetaManagedAgentsAnthropicSkillType = "anthropic"` - `Version string` - `type BetaManagedAgentsCustomSkill struct{…}` A resolved user-created custom skill. - `SkillID string` - `Type BetaManagedAgentsCustomSkillType` - `const BetaManagedAgentsCustomSkillTypeCustom BetaManagedAgentsCustomSkillType = "custom"` - `Version string` - `System string` - `Tools []BetaManagedAgentsSessionThreadAgentToolUnion` - `type BetaManagedAgentsAgentToolset20260401 struct{…}` - `Configs []BetaManagedAgentsAgentToolConfig` - `Enabled bool` - `Name BetaManagedAgentsAgentToolConfigName` Built-in agent tool identifier. - `const BetaManagedAgentsAgentToolConfigNameBash BetaManagedAgentsAgentToolConfigName = "bash"` - `const BetaManagedAgentsAgentToolConfigNameEdit BetaManagedAgentsAgentToolConfigName = "edit"` - `const BetaManagedAgentsAgentToolConfigNameRead BetaManagedAgentsAgentToolConfigName = "read"` - `const BetaManagedAgentsAgentToolConfigNameWrite BetaManagedAgentsAgentToolConfigName = "write"` - `const BetaManagedAgentsAgentToolConfigNameGlob BetaManagedAgentsAgentToolConfigName = "glob"` - `const BetaManagedAgentsAgentToolConfigNameGrep BetaManagedAgentsAgentToolConfigName = "grep"` - `const BetaManagedAgentsAgentToolConfigNameWebFetch BetaManagedAgentsAgentToolConfigName = "web_fetch"` - `const BetaManagedAgentsAgentToolConfigNameWebSearch BetaManagedAgentsAgentToolConfigName = "web_search"` - `PermissionPolicy BetaManagedAgentsAgentToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy struct{…}` Tool calls are automatically approved without user confirmation. - `Type BetaManagedAgentsAlwaysAllowPolicyType` - `const BetaManagedAgentsAlwaysAllowPolicyTypeAlwaysAllow BetaManagedAgentsAlwaysAllowPolicyType = "always_allow"` - `type BetaManagedAgentsAlwaysAskPolicy struct{…}` Tool calls require user confirmation before execution. - `Type BetaManagedAgentsAlwaysAskPolicyType` - `const BetaManagedAgentsAlwaysAskPolicyTypeAlwaysAsk BetaManagedAgentsAlwaysAskPolicyType = "always_ask"` - `DefaultConfig BetaManagedAgentsAgentToolsetDefaultConfig` Resolved default configuration for agent tools. - `Enabled bool` - `PermissionPolicy BetaManagedAgentsAgentToolsetDefaultConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy struct{…}` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy struct{…}` Tool calls require user confirmation before execution. - `Type BetaManagedAgentsAgentToolset20260401Type` - `const BetaManagedAgentsAgentToolset20260401TypeAgentToolset20260401 BetaManagedAgentsAgentToolset20260401Type = "agent_toolset_20260401"` - `type BetaManagedAgentsMCPToolset struct{…}` - `Configs []BetaManagedAgentsMCPToolConfig` - `Enabled bool` - `Name string` - `PermissionPolicy BetaManagedAgentsMCPToolConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy struct{…}` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy struct{…}` Tool calls require user confirmation before execution. - `DefaultConfig BetaManagedAgentsMCPToolsetDefaultConfig` Resolved default configuration for all tools from an MCP server. - `Enabled bool` - `PermissionPolicy BetaManagedAgentsMCPToolsetDefaultConfigPermissionPolicyUnion` Permission policy for tool execution. - `type BetaManagedAgentsAlwaysAllowPolicy struct{…}` Tool calls are automatically approved without user confirmation. - `type BetaManagedAgentsAlwaysAskPolicy struct{…}` Tool calls require user confirmation before execution. - `MCPServerName string` - `Type BetaManagedAgentsMCPToolsetType` - `const BetaManagedAgentsMCPToolsetTypeMCPToolset BetaManagedAgentsMCPToolsetType = "mcp_toolset"` - `type BetaManagedAgentsCustomTool struct{…}` A custom tool as returned in API responses. - `Description string` - `InputSchema BetaManagedAgentsCustomToolInputSchema` JSON Schema for custom tool input parameters. - `Properties map[string, any]` JSON Schema properties defining the tool's input parameters. - `Required []string` List of required property names. - `Type BetaManagedAgentsCustomToolInputSchemaType` Must be 'object' for tool input schemas. - `const BetaManagedAgentsCustomToolInputSchemaTypeObject BetaManagedAgentsCustomToolInputSchemaType = "object"` - `Name string` - `Type BetaManagedAgentsCustomToolType` - `const BetaManagedAgentsCustomToolTypeCustom BetaManagedAgentsCustomToolType = "custom"` - `Type BetaManagedAgentsSessionThreadAgentType` - `const BetaManagedAgentsSessionThreadAgentTypeAgent BetaManagedAgentsSessionThreadAgentType = "agent"` - `Version int64` - `Type BetaManagedAgentsSessionMultiagentCoordinatorType` - `const BetaManagedAgentsSessionMultiagentCoordinatorTypeCoordinator BetaManagedAgentsSessionMultiagentCoordinatorType = "coordinator"` - `Name string` - `Skills []BetaManagedAgentsSessionAgentSkillUnion` - `type BetaManagedAgentsAnthropicSkill struct{…}` A resolved Anthropic-managed skill. - `type BetaManagedAgentsCustomSkill struct{…}` A resolved user-created custom skill. - `System string` - `Tools []BetaManagedAgentsSessionAgentToolUnion` - `type BetaManagedAgentsAgentToolset20260401 struct{…}` - `type BetaManagedAgentsMCPToolset struct{…}` - `type BetaManagedAgentsCustomTool struct{…}` A custom tool as returned in API responses. - `Type BetaManagedAgentsSessionAgentType` - `const BetaManagedAgentsSessionAgentTypeAgent BetaManagedAgentsSessionAgentType = "agent"` - `Version int64` - `Metadata map[string, 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 ```go package main import ( "context" "fmt" "github.com/anthropics/anthropic-sdk-go" "github.com/anthropics/anthropic-sdk-go/option" ) func main() { client := anthropic.NewClient( option.WithAPIKey("my-anthropic-api-key"), ) stream := client.Beta.Sessions.Threads.Events.StreamEvents( context.TODO(), "sthr_011CZkZVWa6oIjw0rgXZpnBt", anthropic.BetaSessionThreadEventStreamParams{ SessionID: "sesn_011CZkZAtmR3yMPDzynEDxu7", }, ) for stream.Next() { fmt.Printf("%+v\n", stream.Current()) } err := stream.Err() if err != nil { panic(err.Error()) } } ``` #### Response ```json { "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ```