# Events ## List Session Thread Events `EventListPage beta().sessions().threads().events().list(EventListParamsparams, RequestOptionsrequestOptions = RequestOptions.none())` **get** `/v1/sessions/{session_id}/threads/{thread_id}/events` List Session Thread Events ### Parameters - `EventListParams params` - `String sessionId` - `Optional threadId` - `Optional limit` Query parameter for limit - `Optional page` Query parameter for page - `Optional> betas` Optional header to specify the beta version(s) you want to use. - `MESSAGE_BATCHES_2024_09_24("message-batches-2024-09-24")` - `PROMPT_CACHING_2024_07_31("prompt-caching-2024-07-31")` - `COMPUTER_USE_2024_10_22("computer-use-2024-10-22")` - `COMPUTER_USE_2025_01_24("computer-use-2025-01-24")` - `PDFS_2024_09_25("pdfs-2024-09-25")` - `TOKEN_COUNTING_2024_11_01("token-counting-2024-11-01")` - `TOKEN_EFFICIENT_TOOLS_2025_02_19("token-efficient-tools-2025-02-19")` - `OUTPUT_128K_2025_02_19("output-128k-2025-02-19")` - `FILES_API_2025_04_14("files-api-2025-04-14")` - `MCP_CLIENT_2025_04_04("mcp-client-2025-04-04")` - `MCP_CLIENT_2025_11_20("mcp-client-2025-11-20")` - `DEV_FULL_THINKING_2025_05_14("dev-full-thinking-2025-05-14")` - `INTERLEAVED_THINKING_2025_05_14("interleaved-thinking-2025-05-14")` - `CODE_EXECUTION_2025_05_22("code-execution-2025-05-22")` - `EXTENDED_CACHE_TTL_2025_04_11("extended-cache-ttl-2025-04-11")` - `CONTEXT_1M_2025_08_07("context-1m-2025-08-07")` - `CONTEXT_MANAGEMENT_2025_06_27("context-management-2025-06-27")` - `MODEL_CONTEXT_WINDOW_EXCEEDED_2025_08_26("model-context-window-exceeded-2025-08-26")` - `SKILLS_2025_10_02("skills-2025-10-02")` - `FAST_MODE_2026_02_01("fast-mode-2026-02-01")` - `OUTPUT_300K_2026_03_24("output-300k-2026-03-24")` - `USER_PROFILES_2026_03_24("user-profiles-2026-03-24")` - `ADVISOR_TOOL_2026_03_01("advisor-tool-2026-03-01")` - `MANAGED_AGENTS_2026_04_01("managed-agents-2026-04-01")` - `CACHE_DIAGNOSIS_2026_04_07("cache-diagnosis-2026-04-07")` - `THINKING_TOKEN_COUNT_2026_05_13("thinking-token-count-2026-05-13")` ### Returns - `class BetaManagedAgentsSessionEvent: A class that can be one of several variants.union` Union type for all event types in a session. - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `String id` Unique identifier for this event. - `List content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `String text` The text content. - `Type type` - `TEXT("text")` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `Source source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `String data` Base64-encoded image data. - `String mediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `Type type` - `BASE64("base64")` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `Type type` - `URL("url")` - `String url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `String fileId` ID of a previously uploaded file. - `Type type` - `FILE("file")` - `Type type` - `IMAGE("image")` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `Source source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `String data` Base64-encoded document data. - `String mediaType` MIME type of the document (e.g., "application/pdf"). - `Type type` - `BASE64("base64")` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `String data` The plain text content. - `MediaType mediaType` MIME type of the text content. Must be "text/plain". - `TEXT_PLAIN("text/plain")` - `Type type` - `TEXT("text")` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `Type type` - `URL("url")` - `String url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `String fileId` ID of a previously uploaded file. - `Type type` - `FILE("file")` - `Type type` - `DOCUMENT("document")` - `Optional context` Additional context about the document for the model. - `Optional title` The title of the document. - `Type type` - `USER_MESSAGE("user.message")` - `Optional processedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `String id` Unique identifier for this event. - `Type type` - `USER_INTERRUPT("user.interrupt")` - `Optional processedAt` A timestamp in RFC 3339 format - `Optional sessionThreadId` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `class BetaManagedAgentsUserToolConfirmationEvent:` A tool confirmation event that approves or denies a pending tool execution. - `String id` Unique identifier for this event. - `Result result` UserToolConfirmationResult enum - `ALLOW("allow")` - `DENY("deny")` - `String toolUseId` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type type` - `USER_TOOL_CONFIRMATION("user.tool_confirmation")` - `Optional denyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `Optional processedAt` A timestamp in RFC 3339 format - `Optional sessionThreadId` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `String id` Unique identifier for this event. - `String customToolUseId` The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type type` - `USER_CUSTOM_TOOL_RESULT("user.custom_tool_result")` - `Optional> content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `BetaManagedAgentsSearchResultCitations citations` Citation settings for a search result. - `boolean enabled` Whether citations are enabled for this search result. - `List content` Array of text content blocks from the search result. - `String text` The text content. - `Type type` - `TEXT("text")` - `String source` The URL source of the search result. - `String title` The title of the search result. - `Type type` - `SEARCH_RESULT("search_result")` - `Optional isError` Whether the tool execution resulted in an error. - `Optional processedAt` A timestamp in RFC 3339 format - `Optional sessionThreadId` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `class BetaManagedAgentsAgentCustomToolUseEvent:` Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result. - `String id` Unique identifier for this event. - `Input input` Input parameters for the tool call. - `String name` Name of the custom tool being called. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_CUSTOM_TOOL_USE("agent.custom_tool_use")` - `Optional sessionThreadId` When set, this event was cross-posted from a subagent's thread to surface its custom tool use on the primary thread's stream. Empty on the thread's own events. Echo this on a `user.custom_tool_result` event to route the result back. - `class BetaManagedAgentsAgentMessageEvent:` An agent response event in the session conversation. - `String id` Unique identifier for this event. - `List content` Array of text blocks comprising the agent response. - `String text` The text content. - `Type type` - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_MESSAGE("agent.message")` - `class BetaManagedAgentsAgentThinkingEvent:` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_THINKING("agent.thinking")` - `class BetaManagedAgentsAgentMcpToolUseEvent:` Event emitted when the agent invokes a tool provided by an MCP server. - `String id` Unique identifier for this event. - `Input input` Input parameters for the tool call. - `String mcpServerName` Name of the MCP server providing the tool. - `String name` Name of the MCP tool being used. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_MCP_TOOL_USE("agent.mcp_tool_use")` - `Optional evaluatedPermission` AgentEvaluatedPermission enum - `ALLOW("allow")` - `ASK("ask")` - `DENY("deny")` - `Optional sessionThreadId` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentMcpToolResultEvent:` Event representing the result of an MCP tool execution. - `String id` Unique identifier for this event. - `String mcpToolUseId` The id of the `agent.mcp_tool_use` event this result corresponds to. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_MCP_TOOL_RESULT("agent.mcp_tool_result")` - `Optional> content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `Optional isError` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent:` Event emitted when the agent invokes a built-in agent tool. - `String id` Unique identifier for this event. - `Input input` Input parameters for the tool call. - `String name` Name of the agent tool being used. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_TOOL_USE("agent.tool_use")` - `Optional evaluatedPermission` AgentEvaluatedPermission enum - `ALLOW("allow")` - `ASK("ask")` - `DENY("deny")` - `Optional sessionThreadId` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentToolResultEvent:` Event representing the result of an agent tool execution. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String toolUseId` The id of the `agent.tool_use` event this result corresponds to. - `Type type` - `AGENT_TOOL_RESULT("agent.tool_result")` - `Optional> content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `Optional isError` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentThreadMessageReceivedEvent:` Delivery event written to the target thread's input stream when an agent-to-agent message arrives. - `String id` Unique identifier for this event. - `List content` Message content blocks. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `String fromSessionThreadId` Public `sthr_` ID of the thread that sent the message. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_THREAD_MESSAGE_RECEIVED("agent.thread_message_received")` - `Optional fromAgentName` Name of the callable agent this message came from. Absent when received from the primary agent. - `class BetaManagedAgentsAgentThreadMessageSentEvent:` Observability event emitted to the sender's output stream when an agent-to-agent message is sent. - `String id` Unique identifier for this event. - `List content` Message content blocks. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String toSessionThreadId` Public `sthr_` ID of the thread the message was sent to. - `Type type` - `AGENT_THREAD_MESSAGE_SENT("agent.thread_message_sent")` - `Optional toAgentName` Name of the callable agent this message was sent to. Absent when sent to the primary agent. - `class BetaManagedAgentsAgentThreadContextCompactedEvent:` Indicates that context compaction (summarization) occurred during the session. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_THREAD_CONTEXT_COMPACTED("agent.thread_context_compacted")` - `class BetaManagedAgentsSessionErrorEvent:` An error event indicating a problem occurred during session execution. - `String id` Unique identifier for this event. - `Error error` An unknown or unexpected error occurred during session execution. A fallback variant; clients that don't recognize a new error code can match on `retry_status` and `message` alone. - `class BetaManagedAgentsUnknownError:` An unknown or unexpected error occurred during session execution. A fallback variant; clients that don't recognize a new error code can match on `retry_status` and `message` alone. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `Type type` - `RETRYING("retrying")` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `Type type` - `EXHAUSTED("exhausted")` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `TERMINAL("terminal")` - `Type type` - `UNKNOWN_ERROR("unknown_error")` - `class BetaManagedAgentsModelOverloadedError:` The model is currently overloaded. Emitted after automatic retries are exhausted. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `MODEL_OVERLOADED_ERROR("model_overloaded_error")` - `class BetaManagedAgentsModelRateLimitedError:` The model request was rate-limited. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `MODEL_RATE_LIMITED_ERROR("model_rate_limited_error")` - `class BetaManagedAgentsModelRequestFailedError:` A model request failed for a reason other than overload or rate-limiting. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `MODEL_REQUEST_FAILED_ERROR("model_request_failed_error")` - `class BetaManagedAgentsMcpConnectionFailedError:` Failed to connect to an MCP server. - `String mcpServerName` Name of the MCP server that failed to connect. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `MCP_CONNECTION_FAILED_ERROR("mcp_connection_failed_error")` - `class BetaManagedAgentsMcpAuthenticationFailedError:` Authentication to an MCP server failed. - `String mcpServerName` Name of the MCP server that failed authentication. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `MCP_AUTHENTICATION_FAILED_ERROR("mcp_authentication_failed_error")` - `class BetaManagedAgentsBillingError:` The caller's organization or workspace cannot make model requests — out of credits or spend limit reached. Retrying with the same credentials will not succeed; the caller must resolve the billing state. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `BILLING_ERROR("billing_error")` - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_ERROR("session.error")` - `class BetaManagedAgentsSessionStatusRescheduledEvent:` Indicates the session is recovering from an error state and is rescheduled for execution. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_STATUS_RESCHEDULED("session.status_rescheduled")` - `class BetaManagedAgentsSessionStatusRunningEvent:` Indicates the session is actively running and the agent is working. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_STATUS_RUNNING("session.status_running")` - `class BetaManagedAgentsSessionStatusIdleEvent:` Indicates the agent has paused and is awaiting user input. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `StopReason stopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `Type type` - `END_TURN("end_turn")` - `class BetaManagedAgentsSessionRequiresAction:` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `List eventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `Type type` - `REQUIRES_ACTION("requires_action")` - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `Type type` - `RETRIES_EXHAUSTED("retries_exhausted")` - `Type type` - `SESSION_STATUS_IDLE("session.status_idle")` - `class BetaManagedAgentsSessionStatusTerminatedEvent:` Indicates the session has terminated, either due to an error or completion. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_STATUS_TERMINATED("session.status_terminated")` - `class BetaManagedAgentsSessionThreadCreatedEvent:` Emitted when a subagent is spawned as a new thread. Written to the parent thread's output stream so clients observing the session see child creation. - `String id` Unique identifier for this event. - `String agentName` Name of the callable agent the thread runs. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String sessionThreadId` Public `sthr_` ID of the newly created thread. - `Type type` - `SESSION_THREAD_CREATED("session.thread_created")` - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent:` Emitted when an outcome evaluation cycle begins. - `String id` Unique identifier for this event. - `long iteration` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `String outcomeId` The `outc_` ID of the outcome being evaluated. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SPAN_OUTCOME_EVALUATION_START("span.outcome_evaluation_start")` - `class BetaManagedAgentsSpanOutcomeEvaluationEndEvent:` Emitted when an outcome evaluation cycle completes. Carries the verdict and aggregate token usage. A verdict of `needs_revision` means another evaluation cycle follows; `satisfied`, `max_iterations_reached`, `failed`, or `interrupted` are terminal — no further evaluation cycles follow. - `String id` Unique identifier for this event. - `String explanation` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `long iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `String outcomeEvaluationStartId` The id of the corresponding `span.outcome_evaluation_start` event. - `String outcomeId` The `outc_` ID of the outcome being evaluated. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String result` Evaluation verdict. 'satisfied': criteria met, session goes idle. 'needs_revision': criteria not met, another revision cycle follows. 'max_iterations_reached': evaluation budget exhausted with criteria still unmet — one final acknowledgment turn follows before the session goes idle, but no further evaluation runs. 'failed': grader determined the rubric does not apply to the deliverables. 'interrupted': user sent an interrupt while evaluation was in progress. - `Type type` - `SPAN_OUTCOME_EVALUATION_END("span.outcome_evaluation_end")` - `BetaManagedAgentsSpanModelUsage usage` Token usage for a single model request. - `long cacheCreationInputTokens` Tokens used to create prompt cache in this request. - `long cacheReadInputTokens` Tokens read from prompt cache in this request. - `long inputTokens` Input tokens consumed by this request. - `long outputTokens` Output tokens generated by this request. - `Optional speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `STANDARD("standard")` - `FAST("fast")` - `class BetaManagedAgentsSpanModelRequestStartEvent:` Emitted when a model request is initiated by the agent. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SPAN_MODEL_REQUEST_START("span.model_request_start")` - `class BetaManagedAgentsSpanModelRequestEndEvent:` Emitted when a model request completes. - `String id` Unique identifier for this event. - `Optional isError` Whether the model request resulted in an error. - `String modelRequestStartId` The id of the corresponding `span.model_request_start` event. - `BetaManagedAgentsSpanModelUsage modelUsage` Token usage for a single model request. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SPAN_MODEL_REQUEST_END("span.model_request_end")` - `class BetaManagedAgentsSpanOutcomeEvaluationOngoingEvent:` Periodic heartbeat emitted while an outcome evaluation cycle is in progress. Distinguishes 'evaluation is actively running' from 'evaluation is stuck' between the corresponding `span.outcome_evaluation_start` and `span.outcome_evaluation_end` events. - `String id` Unique identifier for this event. - `long iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `String outcomeId` The `outc_` ID of the outcome being evaluated. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SPAN_OUTCOME_EVALUATION_ONGOING("span.outcome_evaluation_ongoing")` - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `String id` Unique identifier for this event. - `String description` What the agent should produce. Copied from the input event. - `Optional maxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `String outcomeId` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Rubric rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `String fileId` ID of the rubric file. - `Type type` - `FILE("file")` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `String content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `Type type` - `TEXT("text")` - `Type type` - `USER_DEFINE_OUTCOME("user.define_outcome")` - `class BetaManagedAgentsSessionDeletedEvent:` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_DELETED("session.deleted")` - `class BetaManagedAgentsSessionThreadStatusRunningEvent:` A session thread has begun executing. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `String id` Unique identifier for this event. - `String agentName` Name of the agent the thread runs. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String sessionThreadId` Public sthr_ ID of the thread that started running. - `Type type` - `SESSION_THREAD_STATUS_RUNNING("session.thread_status_running")` - `class BetaManagedAgentsSessionThreadStatusIdleEvent:` A session thread has yielded and is awaiting input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `String id` Unique identifier for this event. - `String agentName` Name of the agent the thread runs. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String sessionThreadId` Public sthr_ ID of the thread that went idle. - `StopReason stopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionRequiresAction:` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `Type type` - `SESSION_THREAD_STATUS_IDLE("session.thread_status_idle")` - `class BetaManagedAgentsSessionThreadStatusTerminatedEvent:` A session thread has terminated and will accept no further input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `String id` Unique identifier for this event. - `String agentName` Name of the agent the thread runs. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String sessionThreadId` Public sthr_ ID of the thread that terminated. - `Type type` - `SESSION_THREAD_STATUS_TERMINATED("session.thread_status_terminated")` - `class BetaManagedAgentsUserToolResultEvent:` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `String id` Unique identifier for this event. - `String toolUseId` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type type` - `USER_TOOL_RESULT("user.tool_result")` - `Optional> content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `Optional isError` Whether the tool execution resulted in an error. - `Optional processedAt` A timestamp in RFC 3339 format - `Optional sessionThreadId` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `class BetaManagedAgentsSessionThreadStatusRescheduledEvent:` A session thread hit a transient error and is retrying automatically. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `String id` Unique identifier for this event. - `String agentName` Name of the agent the thread runs. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String sessionThreadId` Public sthr_ ID of the thread that is retrying. - `Type type` - `SESSION_THREAD_STATUS_RESCHEDULED("session.thread_status_rescheduled")` - `class BetaManagedAgentsSessionUpdatedEvent:` Emitted when an UpdateSession request changed at least one field. Carries only the fields that changed; absent fields were not part of the update. The new configuration applies from the next turn. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_UPDATED("session.updated")` - `Optional agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `String id` - `Optional description` - `List mcpServers` - `String name` - `Type type` - `URL("url")` - `String url` - `BetaManagedAgentsModelConfig model` Model identifier and configuration. - `BetaManagedAgentsModel id` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `CLAUDE_OPUS_4_8("claude-opus-4-8")` Frontier intelligence for long-running agents and coding - `CLAUDE_OPUS_4_7("claude-opus-4-7")` Frontier intelligence for long-running agents and coding - `CLAUDE_OPUS_4_6("claude-opus-4-6")` Most intelligent model for building agents and coding - `CLAUDE_SONNET_4_6("claude-sonnet-4-6")` Best combination of speed and intelligence - `CLAUDE_HAIKU_4_5("claude-haiku-4-5")` Fastest model with near-frontier intelligence - `CLAUDE_HAIKU_4_5_20251001("claude-haiku-4-5-20251001")` Fastest model with near-frontier intelligence - `CLAUDE_OPUS_4_5("claude-opus-4-5")` Premium model combining maximum intelligence with practical performance - `CLAUDE_OPUS_4_5_20251101("claude-opus-4-5-20251101")` Premium model combining maximum intelligence with practical performance - `CLAUDE_SONNET_4_5("claude-sonnet-4-5")` High-performance model for agents and coding - `CLAUDE_SONNET_4_5_20250929("claude-sonnet-4-5-20250929")` High-performance model for agents and coding - `Optional speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `STANDARD("standard")` - `FAST("fast")` - `Optional multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `List agents` Full `agent` definitions the coordinator may spawn as session threads. - `String id` - `Optional description` - `List mcpServers` - `String name` - `Type type` - `String url` - `BetaManagedAgentsModelConfig model` Model identifier and configuration. - `String name` - `List skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `String skillId` - `Type type` - `ANTHROPIC("anthropic")` - `String version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `String skillId` - `Type type` - `CUSTOM("custom")` - `String version` - `Optional system` - `List tools` - `class BetaManagedAgentsAgentToolset20260401:` - `List configs` - `boolean enabled` - `Name name` Built-in agent tool identifier. - `BASH("bash")` - `EDIT("edit")` - `READ("read")` - `WRITE("write")` - `GLOB("glob")` - `GREP("grep")` - `WEB_FETCH("web_fetch")` - `WEB_SEARCH("web_search")` - `PermissionPolicy permissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `Type type` - `ALWAYS_ALLOW("always_allow")` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `Type type` - `ALWAYS_ASK("always_ask")` - `BetaManagedAgentsAgentToolsetDefaultConfig defaultConfig` Resolved default configuration for agent tools. - `boolean enabled` - `PermissionPolicy permissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `Type type` - `AGENT_TOOLSET_20260401("agent_toolset_20260401")` - `class BetaManagedAgentsMcpToolset:` - `List configs` - `boolean enabled` - `String name` - `PermissionPolicy permissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `BetaManagedAgentsMcpToolsetDefaultConfig defaultConfig` Resolved default configuration for all tools from an MCP server. - `boolean enabled` - `PermissionPolicy permissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `String mcpServerName` - `Type type` - `MCP_TOOLSET("mcp_toolset")` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `String description` - `BetaManagedAgentsCustomToolInputSchema inputSchema` JSON Schema for custom tool input parameters. - `Optional properties` JSON Schema properties defining the tool's input parameters. - `Optional> required` List of required property names. - `Optional type` Must be 'object' for tool input schemas. - `OBJECT("object")` - `String name` - `Type type` - `CUSTOM("custom")` - `Type type` - `AGENT("agent")` - `long version` - `Type type` - `COORDINATOR("coordinator")` - `String name` - `List skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `Optional system` - `List tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `Type type` - `AGENT("agent")` - `long version` - `Optional metadata` The session's full metadata bag after the update. Present when the update set non-empty metadata; absent when metadata was unchanged or cleared to empty. - `Optional title` The session's new title. Present only when the update changed it. ### Example ```java package com.anthropic.example; import com.anthropic.client.AnthropicClient; import com.anthropic.client.okhttp.AnthropicOkHttpClient; import com.anthropic.models.beta.sessions.threads.events.EventListPage; import com.anthropic.models.beta.sessions.threads.events.EventListParams; public final class Main { private Main() {} public static void main(String[] args) { AnthropicClient client = AnthropicOkHttpClient.fromEnv(); EventListParams params = EventListParams.builder() .sessionId("sesn_011CZkZAtmR3yMPDzynEDxu7") .threadId("sthr_011CZkZVWa6oIjw0rgXZpnBt") .build(); EventListPage page = client.beta().sessions().threads().events().list(params); } } ``` #### Response ```json { "data": [ { "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ], "next_page": "next_page" } ``` ## Stream Session Thread Events `BetaManagedAgentsStreamSessionThreadEvents beta().sessions().threads().events().streamStreaming(EventStreamParamsparams, RequestOptionsrequestOptions = RequestOptions.none())` **get** `/v1/sessions/{session_id}/threads/{thread_id}/stream` Stream Session Thread Events ### Parameters - `EventStreamParams params` - `String sessionId` - `Optional threadId` - `Optional> betas` Optional header to specify the beta version(s) you want to use. - `MESSAGE_BATCHES_2024_09_24("message-batches-2024-09-24")` - `PROMPT_CACHING_2024_07_31("prompt-caching-2024-07-31")` - `COMPUTER_USE_2024_10_22("computer-use-2024-10-22")` - `COMPUTER_USE_2025_01_24("computer-use-2025-01-24")` - `PDFS_2024_09_25("pdfs-2024-09-25")` - `TOKEN_COUNTING_2024_11_01("token-counting-2024-11-01")` - `TOKEN_EFFICIENT_TOOLS_2025_02_19("token-efficient-tools-2025-02-19")` - `OUTPUT_128K_2025_02_19("output-128k-2025-02-19")` - `FILES_API_2025_04_14("files-api-2025-04-14")` - `MCP_CLIENT_2025_04_04("mcp-client-2025-04-04")` - `MCP_CLIENT_2025_11_20("mcp-client-2025-11-20")` - `DEV_FULL_THINKING_2025_05_14("dev-full-thinking-2025-05-14")` - `INTERLEAVED_THINKING_2025_05_14("interleaved-thinking-2025-05-14")` - `CODE_EXECUTION_2025_05_22("code-execution-2025-05-22")` - `EXTENDED_CACHE_TTL_2025_04_11("extended-cache-ttl-2025-04-11")` - `CONTEXT_1M_2025_08_07("context-1m-2025-08-07")` - `CONTEXT_MANAGEMENT_2025_06_27("context-management-2025-06-27")` - `MODEL_CONTEXT_WINDOW_EXCEEDED_2025_08_26("model-context-window-exceeded-2025-08-26")` - `SKILLS_2025_10_02("skills-2025-10-02")` - `FAST_MODE_2026_02_01("fast-mode-2026-02-01")` - `OUTPUT_300K_2026_03_24("output-300k-2026-03-24")` - `USER_PROFILES_2026_03_24("user-profiles-2026-03-24")` - `ADVISOR_TOOL_2026_03_01("advisor-tool-2026-03-01")` - `MANAGED_AGENTS_2026_04_01("managed-agents-2026-04-01")` - `CACHE_DIAGNOSIS_2026_04_07("cache-diagnosis-2026-04-07")` - `THINKING_TOKEN_COUNT_2026_05_13("thinking-token-count-2026-05-13")` ### Returns - `class BetaManagedAgentsStreamSessionThreadEvents: A class that can be one of several variants.union` Server-sent event in a single thread's stream. - `class BetaManagedAgentsUserMessageEvent:` A user message event in the session conversation. - `String id` Unique identifier for this event. - `List content` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock:` Regular text content. - `String text` The text content. - `Type type` - `TEXT("text")` - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `Source source` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource:` Base64-encoded image data. - `String data` Base64-encoded image data. - `String mediaType` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `Type type` - `BASE64("base64")` - `class BetaManagedAgentsUrlImageSource:` Image referenced by URL. - `Type type` - `URL("url")` - `String url` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource:` Image referenced by file ID. - `String fileId` ID of a previously uploaded file. - `Type type` - `FILE("file")` - `Type type` - `IMAGE("image")` - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `Source source` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource:` Base64-encoded document data. - `String data` Base64-encoded document data. - `String mediaType` MIME type of the document (e.g., "application/pdf"). - `Type type` - `BASE64("base64")` - `class BetaManagedAgentsPlainTextDocumentSource:` Plain text document content. - `String data` The plain text content. - `MediaType mediaType` MIME type of the text content. Must be "text/plain". - `TEXT_PLAIN("text/plain")` - `Type type` - `TEXT("text")` - `class BetaManagedAgentsUrlDocumentSource:` Document referenced by URL. - `Type type` - `URL("url")` - `String url` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource:` Document referenced by file ID. - `String fileId` ID of a previously uploaded file. - `Type type` - `FILE("file")` - `Type type` - `DOCUMENT("document")` - `Optional context` Additional context about the document for the model. - `Optional title` The title of the document. - `Type type` - `USER_MESSAGE("user.message")` - `Optional processedAt` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent:` An interrupt event that pauses agent execution and returns control to the user. - `String id` Unique identifier for this event. - `Type type` - `USER_INTERRUPT("user.interrupt")` - `Optional processedAt` A timestamp in RFC 3339 format - `Optional sessionThreadId` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `class BetaManagedAgentsUserToolConfirmationEvent:` A tool confirmation event that approves or denies a pending tool execution. - `String id` Unique identifier for this event. - `Result result` UserToolConfirmationResult enum - `ALLOW("allow")` - `DENY("deny")` - `String toolUseId` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type type` - `USER_TOOL_CONFIRMATION("user.tool_confirmation")` - `Optional denyMessage` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `Optional processedAt` A timestamp in RFC 3339 format - `Optional sessionThreadId` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent:` Event sent by the client providing the result of a custom tool execution. - `String id` Unique identifier for this event. - `String customToolUseId` The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type type` - `USER_CUSTOM_TOOL_RESULT("user.custom_tool_result")` - `Optional> content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `BetaManagedAgentsSearchResultCitations citations` Citation settings for a search result. - `boolean enabled` Whether citations are enabled for this search result. - `List content` Array of text content blocks from the search result. - `String text` The text content. - `Type type` - `TEXT("text")` - `String source` The URL source of the search result. - `String title` The title of the search result. - `Type type` - `SEARCH_RESULT("search_result")` - `Optional isError` Whether the tool execution resulted in an error. - `Optional processedAt` A timestamp in RFC 3339 format - `Optional sessionThreadId` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `class BetaManagedAgentsAgentCustomToolUseEvent:` Event emitted when the agent calls a custom tool. The session goes idle until the client sends a `user.custom_tool_result` event with the result. - `String id` Unique identifier for this event. - `Input input` Input parameters for the tool call. - `String name` Name of the custom tool being called. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_CUSTOM_TOOL_USE("agent.custom_tool_use")` - `Optional sessionThreadId` When set, this event was cross-posted from a subagent's thread to surface its custom tool use on the primary thread's stream. Empty on the thread's own events. Echo this on a `user.custom_tool_result` event to route the result back. - `class BetaManagedAgentsAgentMessageEvent:` An agent response event in the session conversation. - `String id` Unique identifier for this event. - `List content` Array of text blocks comprising the agent response. - `String text` The text content. - `Type type` - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_MESSAGE("agent.message")` - `class BetaManagedAgentsAgentThinkingEvent:` Indicates the agent is making forward progress via extended thinking. A progress signal, not a content carrier. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_THINKING("agent.thinking")` - `class BetaManagedAgentsAgentMcpToolUseEvent:` Event emitted when the agent invokes a tool provided by an MCP server. - `String id` Unique identifier for this event. - `Input input` Input parameters for the tool call. - `String mcpServerName` Name of the MCP server providing the tool. - `String name` Name of the MCP tool being used. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_MCP_TOOL_USE("agent.mcp_tool_use")` - `Optional evaluatedPermission` AgentEvaluatedPermission enum - `ALLOW("allow")` - `ASK("ask")` - `DENY("deny")` - `Optional sessionThreadId` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentMcpToolResultEvent:` Event representing the result of an MCP tool execution. - `String id` Unique identifier for this event. - `String mcpToolUseId` The id of the `agent.mcp_tool_use` event this result corresponds to. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_MCP_TOOL_RESULT("agent.mcp_tool_result")` - `Optional> content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `Optional isError` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentToolUseEvent:` Event emitted when the agent invokes a built-in agent tool. - `String id` Unique identifier for this event. - `Input input` Input parameters for the tool call. - `String name` Name of the agent tool being used. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_TOOL_USE("agent.tool_use")` - `Optional evaluatedPermission` AgentEvaluatedPermission enum - `ALLOW("allow")` - `ASK("ask")` - `DENY("deny")` - `Optional sessionThreadId` When set, this event was cross-posted from a subagent's thread to surface its permission request on the primary thread's stream. Empty on the thread's own events. Echo this on a `user.tool_confirmation` event to route the approval back. - `class BetaManagedAgentsAgentToolResultEvent:` Event representing the result of an agent tool execution. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String toolUseId` The id of the `agent.tool_use` event this result corresponds to. - `Type type` - `AGENT_TOOL_RESULT("agent.tool_result")` - `Optional> content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `Optional isError` Whether the tool execution resulted in an error. - `class BetaManagedAgentsAgentThreadMessageReceivedEvent:` Delivery event written to the target thread's input stream when an agent-to-agent message arrives. - `String id` Unique identifier for this event. - `List content` Message content blocks. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `String fromSessionThreadId` Public `sthr_` ID of the thread that sent the message. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_THREAD_MESSAGE_RECEIVED("agent.thread_message_received")` - `Optional fromAgentName` Name of the callable agent this message came from. Absent when received from the primary agent. - `class BetaManagedAgentsAgentThreadMessageSentEvent:` Observability event emitted to the sender's output stream when an agent-to-agent message is sent. - `String id` Unique identifier for this event. - `List content` Message content blocks. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String toSessionThreadId` Public `sthr_` ID of the thread the message was sent to. - `Type type` - `AGENT_THREAD_MESSAGE_SENT("agent.thread_message_sent")` - `Optional toAgentName` Name of the callable agent this message was sent to. Absent when sent to the primary agent. - `class BetaManagedAgentsAgentThreadContextCompactedEvent:` Indicates that context compaction (summarization) occurred during the session. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `AGENT_THREAD_CONTEXT_COMPACTED("agent.thread_context_compacted")` - `class BetaManagedAgentsSessionErrorEvent:` An error event indicating a problem occurred during session execution. - `String id` Unique identifier for this event. - `Error error` An unknown or unexpected error occurred during session execution. A fallback variant; clients that don't recognize a new error code can match on `retry_status` and `message` alone. - `class BetaManagedAgentsUnknownError:` An unknown or unexpected error occurred during session execution. A fallback variant; clients that don't recognize a new error code can match on `retry_status` and `message` alone. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `Type type` - `RETRYING("retrying")` - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `Type type` - `EXHAUSTED("exhausted")` - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `TERMINAL("terminal")` - `Type type` - `UNKNOWN_ERROR("unknown_error")` - `class BetaManagedAgentsModelOverloadedError:` The model is currently overloaded. Emitted after automatic retries are exhausted. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `MODEL_OVERLOADED_ERROR("model_overloaded_error")` - `class BetaManagedAgentsModelRateLimitedError:` The model request was rate-limited. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `MODEL_RATE_LIMITED_ERROR("model_rate_limited_error")` - `class BetaManagedAgentsModelRequestFailedError:` A model request failed for a reason other than overload or rate-limiting. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `MODEL_REQUEST_FAILED_ERROR("model_request_failed_error")` - `class BetaManagedAgentsMcpConnectionFailedError:` Failed to connect to an MCP server. - `String mcpServerName` Name of the MCP server that failed to connect. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `MCP_CONNECTION_FAILED_ERROR("mcp_connection_failed_error")` - `class BetaManagedAgentsMcpAuthenticationFailedError:` Authentication to an MCP server failed. - `String mcpServerName` Name of the MCP server that failed authentication. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `MCP_AUTHENTICATION_FAILED_ERROR("mcp_authentication_failed_error")` - `class BetaManagedAgentsBillingError:` The caller's organization or workspace cannot make model requests — out of credits or spend limit reached. Retrying with the same credentials will not succeed; the caller must resolve the billing state. - `String message` Human-readable error description. - `RetryStatus retryStatus` What the client should do next in response to this error. - `class BetaManagedAgentsRetryStatusRetrying:` The server is retrying automatically. Client should wait; the same error type may fire again as retrying, then once as exhausted when the retry budget runs out. - `class BetaManagedAgentsRetryStatusExhausted:` This turn is dead; queued inputs are flushed and the session returns to idle. Client may send a new prompt. - `class BetaManagedAgentsRetryStatusTerminal:` The session encountered a terminal error and will transition to `terminated` state. - `Type type` - `BILLING_ERROR("billing_error")` - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_ERROR("session.error")` - `class BetaManagedAgentsSessionStatusRescheduledEvent:` Indicates the session is recovering from an error state and is rescheduled for execution. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_STATUS_RESCHEDULED("session.status_rescheduled")` - `class BetaManagedAgentsSessionStatusRunningEvent:` Indicates the session is actively running and the agent is working. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_STATUS_RUNNING("session.status_running")` - `class BetaManagedAgentsSessionStatusIdleEvent:` Indicates the agent has paused and is awaiting user input. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `StopReason stopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `Type type` - `END_TURN("end_turn")` - `class BetaManagedAgentsSessionRequiresAction:` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `List eventIds` The ids of events the agent is blocked on. Resolving fewer than all re-emits `session.status_idle` with the remainder. - `Type type` - `REQUIRES_ACTION("requires_action")` - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `Type type` - `RETRIES_EXHAUSTED("retries_exhausted")` - `Type type` - `SESSION_STATUS_IDLE("session.status_idle")` - `class BetaManagedAgentsSessionStatusTerminatedEvent:` Indicates the session has terminated, either due to an error or completion. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_STATUS_TERMINATED("session.status_terminated")` - `class BetaManagedAgentsSessionThreadCreatedEvent:` Emitted when a subagent is spawned as a new thread. Written to the parent thread's output stream so clients observing the session see child creation. - `String id` Unique identifier for this event. - `String agentName` Name of the callable agent the thread runs. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String sessionThreadId` Public `sthr_` ID of the newly created thread. - `Type type` - `SESSION_THREAD_CREATED("session.thread_created")` - `class BetaManagedAgentsSpanOutcomeEvaluationStartEvent:` Emitted when an outcome evaluation cycle begins. - `String id` Unique identifier for this event. - `long iteration` 0-indexed revision cycle. 0 is the first evaluation; 1 is the re-evaluation after the first revision; etc. - `String outcomeId` The `outc_` ID of the outcome being evaluated. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SPAN_OUTCOME_EVALUATION_START("span.outcome_evaluation_start")` - `class BetaManagedAgentsSpanOutcomeEvaluationEndEvent:` Emitted when an outcome evaluation cycle completes. Carries the verdict and aggregate token usage. A verdict of `needs_revision` means another evaluation cycle follows; `satisfied`, `max_iterations_reached`, `failed`, or `interrupted` are terminal — no further evaluation cycles follow. - `String id` Unique identifier for this event. - `String explanation` Human-readable explanation of the verdict. For `needs_revision`, describes which criteria failed and why. - `long iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `String outcomeEvaluationStartId` The id of the corresponding `span.outcome_evaluation_start` event. - `String outcomeId` The `outc_` ID of the outcome being evaluated. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String result` Evaluation verdict. 'satisfied': criteria met, session goes idle. 'needs_revision': criteria not met, another revision cycle follows. 'max_iterations_reached': evaluation budget exhausted with criteria still unmet — one final acknowledgment turn follows before the session goes idle, but no further evaluation runs. 'failed': grader determined the rubric does not apply to the deliverables. 'interrupted': user sent an interrupt while evaluation was in progress. - `Type type` - `SPAN_OUTCOME_EVALUATION_END("span.outcome_evaluation_end")` - `BetaManagedAgentsSpanModelUsage usage` Token usage for a single model request. - `long cacheCreationInputTokens` Tokens used to create prompt cache in this request. - `long cacheReadInputTokens` Tokens read from prompt cache in this request. - `long inputTokens` Input tokens consumed by this request. - `long outputTokens` Output tokens generated by this request. - `Optional speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `STANDARD("standard")` - `FAST("fast")` - `class BetaManagedAgentsSpanModelRequestStartEvent:` Emitted when a model request is initiated by the agent. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SPAN_MODEL_REQUEST_START("span.model_request_start")` - `class BetaManagedAgentsSpanModelRequestEndEvent:` Emitted when a model request completes. - `String id` Unique identifier for this event. - `Optional isError` Whether the model request resulted in an error. - `String modelRequestStartId` The id of the corresponding `span.model_request_start` event. - `BetaManagedAgentsSpanModelUsage modelUsage` Token usage for a single model request. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SPAN_MODEL_REQUEST_END("span.model_request_end")` - `class BetaManagedAgentsSpanOutcomeEvaluationOngoingEvent:` Periodic heartbeat emitted while an outcome evaluation cycle is in progress. Distinguishes 'evaluation is actively running' from 'evaluation is stuck' between the corresponding `span.outcome_evaluation_start` and `span.outcome_evaluation_end` events. - `String id` Unique identifier for this event. - `long iteration` 0-indexed revision cycle, matching the corresponding `span.outcome_evaluation_start`. - `String outcomeId` The `outc_` ID of the outcome being evaluated. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SPAN_OUTCOME_EVALUATION_ONGOING("span.outcome_evaluation_ongoing")` - `class BetaManagedAgentsUserDefineOutcomeEvent:` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `String id` Unique identifier for this event. - `String description` What the agent should produce. Copied from the input event. - `Optional maxIterations` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `String outcomeId` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Rubric rubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric:` Rubric referenced by a file uploaded via the Files API. - `String fileId` ID of the rubric file. - `Type type` - `FILE("file")` - `class BetaManagedAgentsTextRubric:` Rubric content provided inline as text. - `String content` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `Type type` - `TEXT("text")` - `Type type` - `USER_DEFINE_OUTCOME("user.define_outcome")` - `class BetaManagedAgentsSessionDeletedEvent:` Emitted when a session has been deleted. Terminates any active event stream — no further events will be emitted for this session. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_DELETED("session.deleted")` - `class BetaManagedAgentsSessionThreadStatusRunningEvent:` A session thread has begun executing. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `String id` Unique identifier for this event. - `String agentName` Name of the agent the thread runs. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String sessionThreadId` Public sthr_ ID of the thread that started running. - `Type type` - `SESSION_THREAD_STATUS_RUNNING("session.thread_status_running")` - `class BetaManagedAgentsSessionThreadStatusIdleEvent:` A session thread has yielded and is awaiting input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `String id` Unique identifier for this event. - `String agentName` Name of the agent the thread runs. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String sessionThreadId` Public sthr_ ID of the thread that went idle. - `StopReason stopReason` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionEndTurn:` The agent completed its turn naturally and is ready for the next user message. - `class BetaManagedAgentsSessionRequiresAction:` The agent is idle waiting on one or more blocking user-input events (tool confirmation, custom tool result, etc.). Resolving all of them transitions the session back to running. - `class BetaManagedAgentsSessionRetriesExhausted:` The turn ended because the retry budget was exhausted (`max_iterations` hit or an error escalated to `retry_status: 'exhausted'`). - `Type type` - `SESSION_THREAD_STATUS_IDLE("session.thread_status_idle")` - `class BetaManagedAgentsSessionThreadStatusTerminatedEvent:` A session thread has terminated and will accept no further input. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `String id` Unique identifier for this event. - `String agentName` Name of the agent the thread runs. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String sessionThreadId` Public sthr_ ID of the thread that terminated. - `Type type` - `SESSION_THREAD_STATUS_TERMINATED("session.thread_status_terminated")` - `class BetaManagedAgentsUserToolResultEvent:` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `String id` Unique identifier for this event. - `String toolUseId` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type type` - `USER_TOOL_RESULT("user.tool_result")` - `Optional> content` The result content returned by the tool. - `class BetaManagedAgentsTextBlock:` Regular text content. - `class BetaManagedAgentsImageBlock:` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock:` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock:` A block containing a web search result. - `Optional isError` Whether the tool execution resulted in an error. - `Optional processedAt` A timestamp in RFC 3339 format - `Optional sessionThreadId` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `class BetaManagedAgentsSessionThreadStatusRescheduledEvent:` A session thread hit a transient error and is retrying automatically. Emitted on the thread's own stream and cross-posted to the primary stream for child threads. - `String id` Unique identifier for this event. - `String agentName` Name of the agent the thread runs. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `String sessionThreadId` Public sthr_ ID of the thread that is retrying. - `Type type` - `SESSION_THREAD_STATUS_RESCHEDULED("session.thread_status_rescheduled")` - `class BetaManagedAgentsSessionUpdatedEvent:` Emitted when an UpdateSession request changed at least one field. Carries only the fields that changed; absent fields were not part of the update. The new configuration applies from the next turn. - `String id` Unique identifier for this event. - `LocalDateTime processedAt` A timestamp in RFC 3339 format - `Type type` - `SESSION_UPDATED("session.updated")` - `Optional agent` Resolved `agent` definition for a `session`. Snapshot of the `agent` at `session` creation time. - `String id` - `Optional description` - `List mcpServers` - `String name` - `Type type` - `URL("url")` - `String url` - `BetaManagedAgentsModelConfig model` Model identifier and configuration. - `BetaManagedAgentsModel id` The model that will power your agent. See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options. - `CLAUDE_OPUS_4_8("claude-opus-4-8")` Frontier intelligence for long-running agents and coding - `CLAUDE_OPUS_4_7("claude-opus-4-7")` Frontier intelligence for long-running agents and coding - `CLAUDE_OPUS_4_6("claude-opus-4-6")` Most intelligent model for building agents and coding - `CLAUDE_SONNET_4_6("claude-sonnet-4-6")` Best combination of speed and intelligence - `CLAUDE_HAIKU_4_5("claude-haiku-4-5")` Fastest model with near-frontier intelligence - `CLAUDE_HAIKU_4_5_20251001("claude-haiku-4-5-20251001")` Fastest model with near-frontier intelligence - `CLAUDE_OPUS_4_5("claude-opus-4-5")` Premium model combining maximum intelligence with practical performance - `CLAUDE_OPUS_4_5_20251101("claude-opus-4-5-20251101")` Premium model combining maximum intelligence with practical performance - `CLAUDE_SONNET_4_5("claude-sonnet-4-5")` High-performance model for agents and coding - `CLAUDE_SONNET_4_5_20250929("claude-sonnet-4-5-20250929")` High-performance model for agents and coding - `Optional speed` Inference speed mode. `fast` provides significantly faster output token generation at premium pricing. Not all models support `fast`; invalid combinations are rejected at create time. - `STANDARD("standard")` - `FAST("fast")` - `Optional multiagent` Resolved coordinator topology with full agent definitions for each roster member. - `List agents` Full `agent` definitions the coordinator may spawn as session threads. - `String id` - `Optional description` - `List mcpServers` - `String name` - `Type type` - `String url` - `BetaManagedAgentsModelConfig model` Model identifier and configuration. - `String name` - `List skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `String skillId` - `Type type` - `ANTHROPIC("anthropic")` - `String version` - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `String skillId` - `Type type` - `CUSTOM("custom")` - `String version` - `Optional system` - `List tools` - `class BetaManagedAgentsAgentToolset20260401:` - `List configs` - `boolean enabled` - `Name name` Built-in agent tool identifier. - `BASH("bash")` - `EDIT("edit")` - `READ("read")` - `WRITE("write")` - `GLOB("glob")` - `GREP("grep")` - `WEB_FETCH("web_fetch")` - `WEB_SEARCH("web_search")` - `PermissionPolicy permissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `Type type` - `ALWAYS_ALLOW("always_allow")` - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `Type type` - `ALWAYS_ASK("always_ask")` - `BetaManagedAgentsAgentToolsetDefaultConfig defaultConfig` Resolved default configuration for agent tools. - `boolean enabled` - `PermissionPolicy permissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `Type type` - `AGENT_TOOLSET_20260401("agent_toolset_20260401")` - `class BetaManagedAgentsMcpToolset:` - `List configs` - `boolean enabled` - `String name` - `PermissionPolicy permissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `BetaManagedAgentsMcpToolsetDefaultConfig defaultConfig` Resolved default configuration for all tools from an MCP server. - `boolean enabled` - `PermissionPolicy permissionPolicy` Permission policy for tool execution. - `class BetaManagedAgentsAlwaysAllowPolicy:` Tool calls are automatically approved without user confirmation. - `class BetaManagedAgentsAlwaysAskPolicy:` Tool calls require user confirmation before execution. - `String mcpServerName` - `Type type` - `MCP_TOOLSET("mcp_toolset")` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `String description` - `BetaManagedAgentsCustomToolInputSchema inputSchema` JSON Schema for custom tool input parameters. - `Optional properties` JSON Schema properties defining the tool's input parameters. - `Optional> required` List of required property names. - `Optional type` Must be 'object' for tool input schemas. - `OBJECT("object")` - `String name` - `Type type` - `CUSTOM("custom")` - `Type type` - `AGENT("agent")` - `long version` - `Type type` - `COORDINATOR("coordinator")` - `String name` - `List skills` - `class BetaManagedAgentsAnthropicSkill:` A resolved Anthropic-managed skill. - `class BetaManagedAgentsCustomSkill:` A resolved user-created custom skill. - `Optional system` - `List tools` - `class BetaManagedAgentsAgentToolset20260401:` - `class BetaManagedAgentsMcpToolset:` - `class BetaManagedAgentsCustomTool:` A custom tool as returned in API responses. - `Type type` - `AGENT("agent")` - `long version` - `Optional metadata` The session's full metadata bag after the update. Present when the update set non-empty metadata; absent when metadata was unchanged or cleared to empty. - `Optional title` The session's new title. Present only when the update changed it. ### Example ```java package com.anthropic.example; import com.anthropic.client.AnthropicClient; import com.anthropic.client.okhttp.AnthropicOkHttpClient; import com.anthropic.core.http.StreamResponse; import com.anthropic.models.beta.sessions.threads.BetaManagedAgentsStreamSessionThreadEvents; import com.anthropic.models.beta.sessions.threads.events.EventStreamParams; public final class Main { private Main() {} public static void main(String[] args) { AnthropicClient client = AnthropicOkHttpClient.fromEnv(); EventStreamParams params = EventStreamParams.builder() .sessionId("sesn_011CZkZAtmR3yMPDzynEDxu7") .threadId("sthr_011CZkZVWa6oIjw0rgXZpnBt") .build(); StreamResponse betaManagedAgentsStreamSessionThreadEvents = client.beta().sessions().threads().events().streamStreaming(params); } } ``` #### Response ```json { "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ```