## Send Events `beta.sessions.events.send_(session_id, **kwargs) -> BetaManagedAgentsSendSessionEvents` **post** `/v1/sessions/{session_id}/events` Send Events ### Parameters - `session_id: String` - `events: Array[BetaManagedAgentsEventParams]` Events to send to the `session`. - `class BetaManagedAgentsUserMessageEventParams` Parameters for sending a user message to the session. - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock]` Array of content blocks for the user message. - `class BetaManagedAgentsTextBlock` Regular text content. - `text: String` The text content. - `type: :text` - `:text` - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `source: BetaManagedAgentsBase64ImageSource | BetaManagedAgentsURLImageSource | BetaManagedAgentsFileImageSource` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `data: String` Base64-encoded image data. - `media_type: String` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `type: :base64` - `:base64` - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: :url` - `:url` - `url: String` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `file_id: String` ID of a previously uploaded file. - `type: :file` - `:file` - `type: :image` - `:image` - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `source: BetaManagedAgentsBase64DocumentSource | BetaManagedAgentsPlainTextDocumentSource | BetaManagedAgentsURLDocumentSource | BetaManagedAgentsFileDocumentSource` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `data: String` Base64-encoded document data. - `media_type: String` MIME type of the document (e.g., "application/pdf"). - `type: :base64` - `:base64` - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `data: String` The plain text content. - `media_type: :"text/plain"` MIME type of the text content. Must be "text/plain". - `:"text/plain"` - `type: :text` - `:text` - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: :url` - `:url` - `url: String` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `file_id: String` ID of a previously uploaded file. - `type: :file` - `:file` - `type: :document` - `:document` - `context: String` Additional context about the document for the model. - `title: String` The title of the document. - `type: :"user.message"` - `:"user.message"` - `class BetaManagedAgentsUserInterruptEventParams` Parameters for sending an interrupt to pause the agent. - `type: :"user.interrupt"` - `:"user.interrupt"` - `session_thread_id: String` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `class BetaManagedAgentsUserToolConfirmationEventParams` Parameters for confirming or denying a tool execution request. - `result: :allow | :deny` UserToolConfirmationResult enum - `:allow` - `:deny` - `tool_use_id: String` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `type: :"user.tool_confirmation"` - `:"user.tool_confirmation"` - `deny_message: String` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `class BetaManagedAgentsUserCustomToolResultEventParams` Parameters for providing the result of a custom tool execution. - `custom_tool_use_id: String` The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `type: :"user.custom_tool_result"` - `:"user.custom_tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `citations: BetaManagedAgentsSearchResultCitations` Citation settings for a search result. - `enabled: bool` Whether citations are enabled for this search result. - `content: Array[BetaManagedAgentsSearchResultContent]` Array of text content blocks from the search result. - `text: String` The text content. - `type: :text` - `:text` - `source: String` The URL source of the search result. - `title: String` The title of the search result. - `type: :search_result` - `:search_result` - `is_error: bool` Whether the tool execution resulted in an error. - `class BetaManagedAgentsUserDefineOutcomeEventParams` Parameters for defining an outcome the agent should work toward. The agent begins work on receipt. - `description: String` What the agent should produce. This is the task specification. - `rubric: BetaManagedAgentsFileRubricParams | BetaManagedAgentsTextRubricParams` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubricParams` Rubric referenced by a file uploaded via the Files API. - `file_id: String` ID of the rubric file. - `type: :file` - `:file` - `class BetaManagedAgentsTextRubricParams` Rubric content provided inline as text. - `content: String` Rubric content. Plain text or markdown — the grader treats it as freeform text. Maximum 262144 characters. - `type: :text` - `:text` - `type: :"user.define_outcome"` - `:"user.define_outcome"` - `max_iterations: Integer` Eval→revision cycles before giving up. Default 3, max 20. - `class BetaManagedAgentsUserToolResultEventParams` Parameters for providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `tool_use_id: String` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `type: :"user.tool_result"` - `:"user.tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: bool` Whether the tool execution resulted in an error. - `class BetaManagedAgentsSystemMessageEventParams` Privileged context for the accompanying turn and all subsequent turns, appended to the session's system context as a `role: "system"` turn rather than replacing the top-level system prompt. At most one per request: it must be the final event and immediately follow the `user.message`, `user.tool_result`, or `user.custom_tool_result` it accompanies. Only supported on models that accept mid-conversation system messages. - `content: Array[BetaManagedAgentsSystemContentBlock]` System content blocks to append. Text-only. - `text: String` The text content. - `type: :text` - `:text` - `type: :"system.message"` - `:"system.message"` - `betas: Array[AnthropicBeta]` Optional header to specify the beta version(s) you want to use. - `String = String` - `AnthropicBeta = :"message-batches-2024-09-24" | :"prompt-caching-2024-07-31" | :"computer-use-2024-10-22" | 25 more` - `:"message-batches-2024-09-24"` - `:"prompt-caching-2024-07-31"` - `:"computer-use-2024-10-22"` - `:"computer-use-2025-01-24"` - `:"pdfs-2024-09-25"` - `:"token-counting-2024-11-01"` - `:"token-efficient-tools-2025-02-19"` - `:"output-128k-2025-02-19"` - `:"files-api-2025-04-14"` - `:"mcp-client-2025-04-04"` - `:"mcp-client-2025-11-20"` - `:"dev-full-thinking-2025-05-14"` - `:"interleaved-thinking-2025-05-14"` - `:"code-execution-2025-05-22"` - `:"extended-cache-ttl-2025-04-11"` - `:"context-1m-2025-08-07"` - `:"context-management-2025-06-27"` - `:"model-context-window-exceeded-2025-08-26"` - `:"skills-2025-10-02"` - `:"fast-mode-2026-02-01"` - `:"output-300k-2026-03-24"` - `:"user-profiles-2026-03-24"` - `:"advisor-tool-2026-03-01"` - `:"managed-agents-2026-04-01"` - `:"cache-diagnosis-2026-04-07"` - `:"thinking-token-count-2026-05-13"` - `:"server-side-fallback-2026-06-01"` - `:"fallback-credit-2026-06-01"` ### Returns - `class BetaManagedAgentsSendSessionEvents` Events that were successfully sent to the session. - `data: Array[BetaManagedAgentsUserMessageEvent | BetaManagedAgentsUserInterruptEvent | BetaManagedAgentsUserToolConfirmationEvent | 4 more]` Sent events - `class BetaManagedAgentsUserMessageEvent` A user message event in the session conversation. - `id: String` Unique identifier for this event. - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock]` Array of content blocks comprising the user message. - `class BetaManagedAgentsTextBlock` Regular text content. - `text: String` The text content. - `type: :text` - `:text` - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `source: BetaManagedAgentsBase64ImageSource | BetaManagedAgentsURLImageSource | BetaManagedAgentsFileImageSource` Union type for image source variants. - `class BetaManagedAgentsBase64ImageSource` Base64-encoded image data. - `data: String` Base64-encoded image data. - `media_type: String` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `type: :base64` - `:base64` - `class BetaManagedAgentsURLImageSource` Image referenced by URL. - `type: :url` - `:url` - `url: String` URL of the image to fetch. - `class BetaManagedAgentsFileImageSource` Image referenced by file ID. - `file_id: String` ID of a previously uploaded file. - `type: :file` - `:file` - `type: :image` - `:image` - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `source: BetaManagedAgentsBase64DocumentSource | BetaManagedAgentsPlainTextDocumentSource | BetaManagedAgentsURLDocumentSource | BetaManagedAgentsFileDocumentSource` Union type for document source variants. - `class BetaManagedAgentsBase64DocumentSource` Base64-encoded document data. - `data: String` Base64-encoded document data. - `media_type: String` MIME type of the document (e.g., "application/pdf"). - `type: :base64` - `:base64` - `class BetaManagedAgentsPlainTextDocumentSource` Plain text document content. - `data: String` The plain text content. - `media_type: :"text/plain"` MIME type of the text content. Must be "text/plain". - `:"text/plain"` - `type: :text` - `:text` - `class BetaManagedAgentsURLDocumentSource` Document referenced by URL. - `type: :url` - `:url` - `url: String` URL of the document to fetch. - `class BetaManagedAgentsFileDocumentSource` Document referenced by file ID. - `file_id: String` ID of a previously uploaded file. - `type: :file` - `:file` - `type: :document` - `:document` - `context: String` Additional context about the document for the model. - `title: String` The title of the document. - `type: :"user.message"` - `:"user.message"` - `processed_at: Time` A timestamp in RFC 3339 format - `class BetaManagedAgentsUserInterruptEvent` An interrupt event that pauses agent execution and returns control to the user. - `id: String` Unique identifier for this event. - `type: :"user.interrupt"` - `:"user.interrupt"` - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `class BetaManagedAgentsUserToolConfirmationEvent` A tool confirmation event that approves or denies a pending tool execution. - `id: String` Unique identifier for this event. - `result: :allow | :deny` UserToolConfirmationResult enum - `:allow` - `:deny` - `tool_use_id: String` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `type: :"user.tool_confirmation"` - `:"user.tool_confirmation"` - `deny_message: String` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `class BetaManagedAgentsUserCustomToolResultEvent` Event sent by the client providing the result of a custom tool execution. - `id: String` Unique identifier for this event. - `custom_tool_use_id: String` The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `type: :"user.custom_tool_result"` - `:"user.custom_tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `citations: BetaManagedAgentsSearchResultCitations` Citation settings for a search result. - `enabled: bool` Whether citations are enabled for this search result. - `content: Array[BetaManagedAgentsSearchResultContent]` Array of text content blocks from the search result. - `text: String` The text content. - `type: :text` - `:text` - `source: String` The URL source of the search result. - `title: String` The title of the search result. - `type: :search_result` - `:search_result` - `is_error: bool` Whether the tool execution resulted in an error. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `class BetaManagedAgentsUserDefineOutcomeEvent` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `id: String` Unique identifier for this event. - `description: String` What the agent should produce. Copied from the input event. - `max_iterations: Integer` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `outcome_id: String` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `processed_at: Time` A timestamp in RFC 3339 format - `rubric: BetaManagedAgentsFileRubric | BetaManagedAgentsTextRubric` Rubric for grading the quality of an outcome. - `class BetaManagedAgentsFileRubric` Rubric referenced by a file uploaded via the Files API. - `file_id: String` ID of the rubric file. - `type: :file` - `:file` - `class BetaManagedAgentsTextRubric` Rubric content provided inline as text. - `content: String` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `type: :text` - `:text` - `type: :"user.define_outcome"` - `:"user.define_outcome"` - `class BetaManagedAgentsUserToolResultEvent` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `id: String` Unique identifier for this event. - `tool_use_id: String` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `type: :"user.tool_result"` - `:"user.tool_result"` - `content: Array[BetaManagedAgentsTextBlock | BetaManagedAgentsImageBlock | BetaManagedAgentsDocumentBlock | BetaManagedAgentsSearchResultBlock]` The result content returned by the tool. - `class BetaManagedAgentsTextBlock` Regular text content. - `class BetaManagedAgentsImageBlock` Image content specified directly as base64 data or as a reference via a URL. - `class BetaManagedAgentsDocumentBlock` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `class BetaManagedAgentsSearchResultBlock` A block containing a web search result. - `is_error: bool` Whether the tool execution resulted in an error. - `processed_at: Time` A timestamp in RFC 3339 format - `session_thread_id: String` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `class BetaManagedAgentsSystemMessageEvent` A mid-conversation system message event. Carries system-role content that is appended to the session as a `role: "system"` turn. - `id: String` Unique identifier for this event. - `content: Array[BetaManagedAgentsSystemContentBlock]` System content blocks. Text-only. - `text: String` The text content. - `type: :text` - `:text` - `type: :"system.message"` - `:"system.message"` - `processed_at: Time` A timestamp in RFC 3339 format ### Example ```ruby require "anthropic" anthropic = Anthropic::Client.new(api_key: "my-anthropic-api-key") beta_managed_agents_send_session_events = anthropic.beta.sessions.events.send_( "sesn_011CZkZAtmR3yMPDzynEDxu7", events: [{content: [{text: "Where is my order #1234?", type: :text}], type: :"user.message"}] ) puts(beta_managed_agents_send_session_events) ``` #### 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" } ] } ```