--- title: Send Events url: https://platform.claude.com/docs/en/api/cli/beta/sessions/events/send --- # Send Events `$ ant beta:sessions:events send` **POST** `/v1/sessions/{session_id}/events` Send Events ## Parameters - `--session-id: string` (path parameter) - `--event: array of BetaManagedAgentsEventParams` Events to send to the `session`. - `--beta: optional array of AnthropicBeta` (header parameter) This endpoint is in beta: requests must send `managed-agents-2026-04-01` in this header. - `--workspace-id: optional string` (header parameter) Optional header to select the Workspace for this request. The value is a Workspace ID (for example, `wrkspc_011CZkZaBF1tNoB5wlCeusgy`). Only needed for credentials that can act on more than one Workspace. A credential that belongs to a specific Workspace may omit it; if sent, it must match that Workspace. ## Returns - `beta_managed_agents_send_session_events: object` Events that were successfully sent to the session. - `data: optional array of BetaManagedAgentsUserMessageEvent or BetaManagedAgentsUserInterruptEvent or BetaManagedAgentsUserToolConfirmationEvent or 4 more` Sent events - `beta_managed_agents_user_message_event: object` A user message event in the session conversation. - `type: "user.message"` - `id: string` Unique identifier for this event. - `content: array of BetaManagedAgentsTextBlock or BetaManagedAgentsImageBlock or BetaManagedAgentsDocumentBlock or BetaManagedAgentsRedactedBlock` Array of content blocks comprising the user message. - `beta_managed_agents_text_block: object` Regular text content. - `type: "text"` - `text: string` The text content. minLength: 1 - `beta_managed_agents_image_block: object` Image content specified directly as base64 data or as a reference via a URL. - `type: "image"` - `source: BetaManagedAgentsBase64ImageSource or BetaManagedAgentsURLImageSource or BetaManagedAgentsFileImageSource` The source of the image data. - `beta_managed_agents_base64_image_source: object` Base64-encoded image data. - `type: "base64"` - `data: string` Base64-encoded image data. minLength: 1 - `media_type: string` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). minLength: 1 - `beta_managed_agents_url_image_source: object` Image referenced by URL. - `type: "url"` - `url: string` URL of the image to fetch. minLength: 1 - `beta_managed_agents_file_image_source: object` Image referenced by file ID. - `type: "file"` - `file_id: string` ID of a previously uploaded file. minLength: 1 - `beta_managed_agents_document_block: object` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type: "document"` - `source: BetaManagedAgentsBase64DocumentSource or BetaManagedAgentsPlainTextDocumentSource or BetaManagedAgentsURLDocumentSource or BetaManagedAgentsFileDocumentSource` The source of the document data. - `beta_managed_agents_base64_document_source: object` Base64-encoded document data. - `type: "base64"` - `data: string` Base64-encoded document data. minLength: 1 - `media_type: string` MIME type of the document (e.g., "application/pdf"). minLength: 1 - `beta_managed_agents_plain_text_document_source: object` Plain text document content. - `type: "text"` - `data: string` The plain text content. minLength: 1 - `media_type: "text/plain"` MIME type of the text content. Must be "text/plain". - `beta_managed_agents_url_document_source: object` Document referenced by URL. - `type: "url"` - `url: string` URL of the document to fetch. minLength: 1 - `beta_managed_agents_file_document_source: object` Document referenced by file ID. - `type: "file"` - `file_id: string` ID of a previously uploaded file. minLength: 1 - `context: optional string` Additional context about the document for the model. - `title: optional string` The title of the document. - `beta_managed_agents_redacted_block: object` Placeholder for content withheld by Anthropic model policy. - `type: "redacted"` - `processed_at: optional string` Timestamp when the agent finished processing this message. format: date-time - `beta_managed_agents_user_interrupt_event: object` An interrupt event that pauses agent execution and returns control to the user. - `type: "user.interrupt"` - `id: string` Unique identifier for this event. - `processed_at: optional string` Timestamp when the interrupt was processed. format: date-time - `session_thread_id: optional 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. - `beta_managed_agents_user_tool_confirmation_event: object` A tool confirmation event that approves or denies a pending tool execution. - `type: "user.tool_confirmation"` - `id: string` Unique identifier for this event. - `result: "allow" or "deny"` The confirmation result: 'allow' or 'deny'. - `"allow"` - `"deny"` - `tool_use_id: string` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=cli#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `deny_message: optional string` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. maxLength: 10000 - `processed_at: optional string` Timestamp when the confirmation was processed. format: date-time - `session_thread_id: optional string` Set by the server to the subagent thread this confirmation was routed to. Omitted when it was routed to the primary thread. - `beta_managed_agents_user_custom_tool_result_event: object` Event sent by the client providing the result of a custom tool execution. - `type: "user.custom_tool_result"` - `id: string` Unique identifier for this event. - `custom_tool_use_id: string` The id of the `agent.custom_tool_use` event this result corresponds to. It is also listed in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=cli#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: optional array of BetaManagedAgentsTextBlock or BetaManagedAgentsImageBlock or BetaManagedAgentsDocumentBlock or BetaManagedAgentsSearchResultBlock` The result content returned by the tool. - `beta_managed_agents_text_block: object` Regular text content. - `beta_managed_agents_image_block: object` Image content specified directly as base64 data or as a reference via a URL. - `beta_managed_agents_document_block: object` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `beta_managed_agents_search_result_block: object` A block containing a web search result. - `type: "search_result"` - `citations: object` Citation settings for this search result. - `enabled: boolean` Whether citations are enabled for this search result. - `content: array of BetaManagedAgentsSearchResultContent` Array of text content blocks from the search result. - `type: "text"` - `text: string` The text content. minLength: 1 - `source: string` The URL source of the search result. minLength: 1 - `title: string` The title of the search result. minLength: 1 - `is_error: optional boolean` Whether the tool execution resulted in an error. - `processed_at: optional string` Timestamp when this result was processed. format: date-time - `session_thread_id: optional string` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `beta_managed_agents_user_define_outcome_event: object` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `type: "user.define_outcome"` - `id: string` Unique identifier for this event. - `description: string` What the agent should produce. Copied from the input event. - `max_iterations: number` Evaluate-then-revise cycles before giving up. Default 3, max 20. format: int32 - `outcome_id: string` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `processed_at: string` Timestamp when the outcome was accepted. format: date-time - `rubric: BetaManagedAgentsFileRubric or BetaManagedAgentsTextRubric` How to grade the outcome. File rubrics are currently resolved to their text content; clients should handle both variants. - `beta_managed_agents_file_rubric: object` Rubric referenced by a file uploaded via the Files API. - `type: "file"` - `file_id: string` ID of the rubric file. - `beta_managed_agents_text_rubric: object` Rubric content provided inline as text. - `type: "text"` - `content: string` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `beta_managed_agents_user_tool_result_event: object` 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. - `type: "user.tool_result"` - `id: string` Unique identifier for this event. - `tool_use_id: string` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list?sdk_languages=cli#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `content: optional array of BetaManagedAgentsTextBlock or BetaManagedAgentsImageBlock or BetaManagedAgentsDocumentBlock or BetaManagedAgentsSearchResultBlock` The result content returned by the tool. - `beta_managed_agents_text_block: object` Regular text content. - `beta_managed_agents_image_block: object` Image content specified directly as base64 data or as a reference via a URL. - `beta_managed_agents_document_block: object` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `beta_managed_agents_search_result_block: object` A block containing a web search result. - `is_error: optional boolean` Whether the tool execution resulted in an error. - `processed_at: optional string` Timestamp when this result was processed. format: date-time - `session_thread_id: optional string` Set by the server to the subagent thread this result was routed to. Omitted when it was routed to the primary thread. - `beta_managed_agents_system_message_event: object` A mid-conversation system message event. Carries system-role content that is appended to the session as a `role: "system"` turn. - `type: "system.message"` - `id: string` Unique identifier for this event. - `content: array of BetaManagedAgentsSystemContentBlock` System content blocks. Text-only. - `type: "text"` - `text: string` The text content. minLength: 1 - `processed_at: optional string` Timestamp when this system message was processed. format: date-time ## Example ```bash ant beta:sessions:events send \ --api-key my-anthropic-api-key \ --session-id sesn_011CZkZAtmR3yMPDzynEDxu7 \ --event '{content: [{text: '\''Where is my order #1234?'\'', type: text}], type: user.message}' ``` ### Response (200) ```json { "data": [ { "id": "sevt_011CZkZGPp1iBcp4kaQSihUm", "content": [ { "text": "Where is my order #1234?", "type": "text" } ], "type": "user.message", "processed_at": "2026-03-15T10:00:00Z" } ] } ```