## Send Events `client.Beta.Sessions.Events.Send(ctx, sessionID, params) (*BetaManagedAgentsSendSessionEvents, error)` **post** `/v1/sessions/{session_id}/events` Send Events ### Parameters - `sessionID string` - `params BetaSessionEventSendParams` - `Events param.Field[[]BetaManagedAgentsEventParamsUnionResp]` Body param: Events to send to the `session`. - `type BetaManagedAgentsUserMessageEventParamsResp struct{…}` Parameters for sending a user message to the session. - `Content []BetaManagedAgentsUserMessageEventParamsContentUnionResp` Array of content blocks for the user message. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `Text string` The text content. - `Type BetaManagedAgentsTextBlockType` - `const BetaManagedAgentsTextBlockTypeText BetaManagedAgentsTextBlockType = "text"` - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `Source BetaManagedAgentsImageBlockSourceUnion` Union type for image source variants. - `type BetaManagedAgentsBase64ImageSource struct{…}` Base64-encoded image data. - `Data string` Base64-encoded image data. - `MediaType string` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `Type BetaManagedAgentsBase64ImageSourceType` - `const BetaManagedAgentsBase64ImageSourceTypeBase64 BetaManagedAgentsBase64ImageSourceType = "base64"` - `type BetaManagedAgentsURLImageSource struct{…}` Image referenced by URL. - `Type BetaManagedAgentsURLImageSourceType` - `const BetaManagedAgentsURLImageSourceTypeURL BetaManagedAgentsURLImageSourceType = "url"` - `URL string` URL of the image to fetch. - `type BetaManagedAgentsFileImageSource struct{…}` Image referenced by file ID. - `FileID string` ID of a previously uploaded file. - `Type BetaManagedAgentsFileImageSourceType` - `const BetaManagedAgentsFileImageSourceTypeFile BetaManagedAgentsFileImageSourceType = "file"` - `Type BetaManagedAgentsImageBlockType` - `const BetaManagedAgentsImageBlockTypeImage BetaManagedAgentsImageBlockType = "image"` - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `Source BetaManagedAgentsDocumentBlockSourceUnion` Union type for document source variants. - `type BetaManagedAgentsBase64DocumentSource struct{…}` Base64-encoded document data. - `Data string` Base64-encoded document data. - `MediaType string` MIME type of the document (e.g., "application/pdf"). - `Type BetaManagedAgentsBase64DocumentSourceType` - `const BetaManagedAgentsBase64DocumentSourceTypeBase64 BetaManagedAgentsBase64DocumentSourceType = "base64"` - `type BetaManagedAgentsPlainTextDocumentSource struct{…}` Plain text document content. - `Data string` The plain text content. - `MediaType BetaManagedAgentsPlainTextDocumentSourceMediaType` MIME type of the text content. Must be "text/plain". - `const BetaManagedAgentsPlainTextDocumentSourceMediaTypeTextPlain BetaManagedAgentsPlainTextDocumentSourceMediaType = "text/plain"` - `Type BetaManagedAgentsPlainTextDocumentSourceType` - `const BetaManagedAgentsPlainTextDocumentSourceTypeText BetaManagedAgentsPlainTextDocumentSourceType = "text"` - `type BetaManagedAgentsURLDocumentSource struct{…}` Document referenced by URL. - `Type BetaManagedAgentsURLDocumentSourceType` - `const BetaManagedAgentsURLDocumentSourceTypeURL BetaManagedAgentsURLDocumentSourceType = "url"` - `URL string` URL of the document to fetch. - `type BetaManagedAgentsFileDocumentSource struct{…}` Document referenced by file ID. - `FileID string` ID of a previously uploaded file. - `Type BetaManagedAgentsFileDocumentSourceType` - `const BetaManagedAgentsFileDocumentSourceTypeFile BetaManagedAgentsFileDocumentSourceType = "file"` - `Type BetaManagedAgentsDocumentBlockType` - `const BetaManagedAgentsDocumentBlockTypeDocument BetaManagedAgentsDocumentBlockType = "document"` - `Context string` Additional context about the document for the model. - `Title string` The title of the document. - `Type BetaManagedAgentsUserMessageEventParamsType` - `const BetaManagedAgentsUserMessageEventParamsTypeUserMessage BetaManagedAgentsUserMessageEventParamsType = "user.message"` - `type BetaManagedAgentsUserInterruptEventParamsResp struct{…}` Parameters for sending an interrupt to pause the agent. - `Type BetaManagedAgentsUserInterruptEventParamsType` - `const BetaManagedAgentsUserInterruptEventParamsTypeUserInterrupt BetaManagedAgentsUserInterruptEventParamsType = "user.interrupt"` - `SessionThreadID string` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `type BetaManagedAgentsUserToolConfirmationEventParamsResp struct{…}` Parameters for confirming or denying a tool execution request. - `Result BetaManagedAgentsUserToolConfirmationEventParamsResult` UserToolConfirmationResult enum - `const BetaManagedAgentsUserToolConfirmationEventParamsResultAllow BetaManagedAgentsUserToolConfirmationEventParamsResult = "allow"` - `const BetaManagedAgentsUserToolConfirmationEventParamsResultDeny BetaManagedAgentsUserToolConfirmationEventParamsResult = "deny"` - `ToolUseID string` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type BetaManagedAgentsUserToolConfirmationEventParamsType` - `const BetaManagedAgentsUserToolConfirmationEventParamsTypeUserToolConfirmation BetaManagedAgentsUserToolConfirmationEventParamsType = "user.tool_confirmation"` - `DenyMessage string` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `type BetaManagedAgentsUserCustomToolResultEventParamsResp struct{…}` Parameters for providing the result of a custom tool execution. - `CustomToolUseID string` The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type BetaManagedAgentsUserCustomToolResultEventParamsType` - `const BetaManagedAgentsUserCustomToolResultEventParamsTypeUserCustomToolResult BetaManagedAgentsUserCustomToolResultEventParamsType = "user.custom_tool_result"` - `Content []BetaManagedAgentsUserCustomToolResultEventParamsContentUnionResp` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` A block containing a web search result. - `Citations BetaManagedAgentsSearchResultCitations` Citation settings for a search result. - `Enabled bool` Whether citations are enabled for this search result. - `Content []BetaManagedAgentsSearchResultContent` Array of text content blocks from the search result. - `Text string` The text content. - `Type BetaManagedAgentsSearchResultContentType` - `const BetaManagedAgentsSearchResultContentTypeText BetaManagedAgentsSearchResultContentType = "text"` - `Source string` The URL source of the search result. - `Title string` The title of the search result. - `Type BetaManagedAgentsSearchResultBlockType` - `const BetaManagedAgentsSearchResultBlockTypeSearchResult BetaManagedAgentsSearchResultBlockType = "search_result"` - `IsError bool` Whether the tool execution resulted in an error. - `type BetaManagedAgentsUserDefineOutcomeEventParamsResp struct{…}` 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 BetaManagedAgentsUserDefineOutcomeEventParamsRubricUnionResp` Rubric for grading the quality of an outcome. - `type BetaManagedAgentsFileRubricParamsResp struct{…}` Rubric referenced by a file uploaded via the Files API. - `FileID string` ID of the rubric file. - `Type BetaManagedAgentsFileRubricParamsType` - `const BetaManagedAgentsFileRubricParamsTypeFile BetaManagedAgentsFileRubricParamsType = "file"` - `type BetaManagedAgentsTextRubricParamsResp struct{…}` 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 BetaManagedAgentsTextRubricParamsType` - `const BetaManagedAgentsTextRubricParamsTypeText BetaManagedAgentsTextRubricParamsType = "text"` - `Type BetaManagedAgentsUserDefineOutcomeEventParamsType` - `const BetaManagedAgentsUserDefineOutcomeEventParamsTypeUserDefineOutcome BetaManagedAgentsUserDefineOutcomeEventParamsType = "user.define_outcome"` - `MaxIterations int64` Eval→revision cycles before giving up. Default 3, max 20. - `type BetaManagedAgentsUserToolResultEventParamsResp struct{…}` 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. - `ToolUseID string` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type BetaManagedAgentsUserToolResultEventParamsType` - `const BetaManagedAgentsUserToolResultEventParamsTypeUserToolResult BetaManagedAgentsUserToolResultEventParamsType = "user.tool_result"` - `Content []BetaManagedAgentsUserToolResultEventParamsContentUnionResp` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` A block containing a web search result. - `IsError bool` Whether the tool execution resulted in an error. - `type BetaManagedAgentsSystemMessageEventParamsResp struct{…}` 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 []BetaManagedAgentsSystemContentBlock` System content blocks to append. Text-only. - `Text string` The text content. - `Type BetaManagedAgentsSystemContentBlockType` - `const BetaManagedAgentsSystemContentBlockTypeText BetaManagedAgentsSystemContentBlockType = "text"` - `Type BetaManagedAgentsSystemMessageEventParamsType` - `const BetaManagedAgentsSystemMessageEventParamsTypeSystemMessage BetaManagedAgentsSystemMessageEventParamsType = "system.message"` - `Betas param.Field[[]AnthropicBeta]` Header param: Optional header to specify the beta version(s) you want to use. - `string` - `type AnthropicBeta string` - `const AnthropicBetaMessageBatches2024_09_24 AnthropicBeta = "message-batches-2024-09-24"` - `const AnthropicBetaPromptCaching2024_07_31 AnthropicBeta = "prompt-caching-2024-07-31"` - `const AnthropicBetaComputerUse2024_10_22 AnthropicBeta = "computer-use-2024-10-22"` - `const AnthropicBetaComputerUse2025_01_24 AnthropicBeta = "computer-use-2025-01-24"` - `const AnthropicBetaPDFs2024_09_25 AnthropicBeta = "pdfs-2024-09-25"` - `const AnthropicBetaTokenCounting2024_11_01 AnthropicBeta = "token-counting-2024-11-01"` - `const AnthropicBetaTokenEfficientTools2025_02_19 AnthropicBeta = "token-efficient-tools-2025-02-19"` - `const AnthropicBetaOutput128k2025_02_19 AnthropicBeta = "output-128k-2025-02-19"` - `const AnthropicBetaFilesAPI2025_04_14 AnthropicBeta = "files-api-2025-04-14"` - `const AnthropicBetaMCPClient2025_04_04 AnthropicBeta = "mcp-client-2025-04-04"` - `const AnthropicBetaMCPClient2025_11_20 AnthropicBeta = "mcp-client-2025-11-20"` - `const AnthropicBetaDevFullThinking2025_05_14 AnthropicBeta = "dev-full-thinking-2025-05-14"` - `const AnthropicBetaInterleavedThinking2025_05_14 AnthropicBeta = "interleaved-thinking-2025-05-14"` - `const AnthropicBetaCodeExecution2025_05_22 AnthropicBeta = "code-execution-2025-05-22"` - `const AnthropicBetaExtendedCacheTTL2025_04_11 AnthropicBeta = "extended-cache-ttl-2025-04-11"` - `const AnthropicBetaContext1m2025_08_07 AnthropicBeta = "context-1m-2025-08-07"` - `const AnthropicBetaContextManagement2025_06_27 AnthropicBeta = "context-management-2025-06-27"` - `const AnthropicBetaModelContextWindowExceeded2025_08_26 AnthropicBeta = "model-context-window-exceeded-2025-08-26"` - `const AnthropicBetaSkills2025_10_02 AnthropicBeta = "skills-2025-10-02"` - `const AnthropicBetaFastMode2026_02_01 AnthropicBeta = "fast-mode-2026-02-01"` - `const AnthropicBetaOutput300k2026_03_24 AnthropicBeta = "output-300k-2026-03-24"` - `const AnthropicBetaUserProfiles2026_03_24 AnthropicBeta = "user-profiles-2026-03-24"` - `const AnthropicBetaAdvisorTool2026_03_01 AnthropicBeta = "advisor-tool-2026-03-01"` - `const AnthropicBetaManagedAgents2026_04_01 AnthropicBeta = "managed-agents-2026-04-01"` - `const AnthropicBetaCacheDiagnosis2026_04_07 AnthropicBeta = "cache-diagnosis-2026-04-07"` - `const AnthropicBetaThinkingTokenCount2026_05_13 AnthropicBeta = "thinking-token-count-2026-05-13"` - `const AnthropicBetaServerSideFallback2026_06_01 AnthropicBeta = "server-side-fallback-2026-06-01"` - `const AnthropicBetaFallbackCredit2026_06_01 AnthropicBeta = "fallback-credit-2026-06-01"` ### Returns - `type BetaManagedAgentsSendSessionEvents struct{…}` Events that were successfully sent to the session. - `Data []BetaManagedAgentsSendSessionEventsDataUnion` Sent events - `type BetaManagedAgentsUserMessageEvent struct{…}` A user message event in the session conversation. - `ID string` Unique identifier for this event. - `Content []BetaManagedAgentsUserMessageEventContentUnion` Array of content blocks comprising the user message. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `Text string` The text content. - `Type BetaManagedAgentsTextBlockType` - `const BetaManagedAgentsTextBlockTypeText BetaManagedAgentsTextBlockType = "text"` - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `Source BetaManagedAgentsImageBlockSourceUnion` Union type for image source variants. - `type BetaManagedAgentsBase64ImageSource struct{…}` Base64-encoded image data. - `Data string` Base64-encoded image data. - `MediaType string` MIME type of the image (e.g., "image/png", "image/jpeg", "image/gif", "image/webp"). - `Type BetaManagedAgentsBase64ImageSourceType` - `const BetaManagedAgentsBase64ImageSourceTypeBase64 BetaManagedAgentsBase64ImageSourceType = "base64"` - `type BetaManagedAgentsURLImageSource struct{…}` Image referenced by URL. - `Type BetaManagedAgentsURLImageSourceType` - `const BetaManagedAgentsURLImageSourceTypeURL BetaManagedAgentsURLImageSourceType = "url"` - `URL string` URL of the image to fetch. - `type BetaManagedAgentsFileImageSource struct{…}` Image referenced by file ID. - `FileID string` ID of a previously uploaded file. - `Type BetaManagedAgentsFileImageSourceType` - `const BetaManagedAgentsFileImageSourceTypeFile BetaManagedAgentsFileImageSourceType = "file"` - `Type BetaManagedAgentsImageBlockType` - `const BetaManagedAgentsImageBlockTypeImage BetaManagedAgentsImageBlockType = "image"` - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `Source BetaManagedAgentsDocumentBlockSourceUnion` Union type for document source variants. - `type BetaManagedAgentsBase64DocumentSource struct{…}` Base64-encoded document data. - `Data string` Base64-encoded document data. - `MediaType string` MIME type of the document (e.g., "application/pdf"). - `Type BetaManagedAgentsBase64DocumentSourceType` - `const BetaManagedAgentsBase64DocumentSourceTypeBase64 BetaManagedAgentsBase64DocumentSourceType = "base64"` - `type BetaManagedAgentsPlainTextDocumentSource struct{…}` Plain text document content. - `Data string` The plain text content. - `MediaType BetaManagedAgentsPlainTextDocumentSourceMediaType` MIME type of the text content. Must be "text/plain". - `const BetaManagedAgentsPlainTextDocumentSourceMediaTypeTextPlain BetaManagedAgentsPlainTextDocumentSourceMediaType = "text/plain"` - `Type BetaManagedAgentsPlainTextDocumentSourceType` - `const BetaManagedAgentsPlainTextDocumentSourceTypeText BetaManagedAgentsPlainTextDocumentSourceType = "text"` - `type BetaManagedAgentsURLDocumentSource struct{…}` Document referenced by URL. - `Type BetaManagedAgentsURLDocumentSourceType` - `const BetaManagedAgentsURLDocumentSourceTypeURL BetaManagedAgentsURLDocumentSourceType = "url"` - `URL string` URL of the document to fetch. - `type BetaManagedAgentsFileDocumentSource struct{…}` Document referenced by file ID. - `FileID string` ID of a previously uploaded file. - `Type BetaManagedAgentsFileDocumentSourceType` - `const BetaManagedAgentsFileDocumentSourceTypeFile BetaManagedAgentsFileDocumentSourceType = "file"` - `Type BetaManagedAgentsDocumentBlockType` - `const BetaManagedAgentsDocumentBlockTypeDocument BetaManagedAgentsDocumentBlockType = "document"` - `Context string` Additional context about the document for the model. - `Title string` The title of the document. - `Type BetaManagedAgentsUserMessageEventType` - `const BetaManagedAgentsUserMessageEventTypeUserMessage BetaManagedAgentsUserMessageEventType = "user.message"` - `ProcessedAt Time` A timestamp in RFC 3339 format - `type BetaManagedAgentsUserInterruptEvent struct{…}` An interrupt event that pauses agent execution and returns control to the user. - `ID string` Unique identifier for this event. - `Type BetaManagedAgentsUserInterruptEventType` - `const BetaManagedAgentsUserInterruptEventTypeUserInterrupt BetaManagedAgentsUserInterruptEventType = "user.interrupt"` - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` If absent, interrupts every non-archived thread in a multiagent session (or the primary alone in a single-agent session). If present, interrupts only the named thread. - `type BetaManagedAgentsUserToolConfirmationEvent struct{…}` A tool confirmation event that approves or denies a pending tool execution. - `ID string` Unique identifier for this event. - `Result BetaManagedAgentsUserToolConfirmationEventResult` UserToolConfirmationResult enum - `const BetaManagedAgentsUserToolConfirmationEventResultAllow BetaManagedAgentsUserToolConfirmationEventResult = "allow"` - `const BetaManagedAgentsUserToolConfirmationEventResultDeny BetaManagedAgentsUserToolConfirmationEventResult = "deny"` - `ToolUseID string` The id of the `agent.tool_use` or `agent.mcp_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type BetaManagedAgentsUserToolConfirmationEventType` - `const BetaManagedAgentsUserToolConfirmationEventTypeUserToolConfirmation BetaManagedAgentsUserToolConfirmationEventType = "user.tool_confirmation"` - `DenyMessage string` Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` When set, the confirmation routes to this subagent's thread rather than the primary. Echo this from the `session_thread_id` on the `agent.tool_use` or `agent.mcp_tool_use` event that prompted the approval. - `type BetaManagedAgentsUserCustomToolResultEvent struct{…}` Event sent by the client providing the result of a custom tool execution. - `ID string` Unique identifier for this event. - `CustomToolUseID string` The id of the `agent.custom_tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type BetaManagedAgentsUserCustomToolResultEventType` - `const BetaManagedAgentsUserCustomToolResultEventTypeUserCustomToolResult BetaManagedAgentsUserCustomToolResultEventType = "user.custom_tool_result"` - `Content []BetaManagedAgentsUserCustomToolResultEventContentUnion` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` A block containing a web search result. - `Citations BetaManagedAgentsSearchResultCitations` Citation settings for a search result. - `Enabled bool` Whether citations are enabled for this search result. - `Content []BetaManagedAgentsSearchResultContent` Array of text content blocks from the search result. - `Text string` The text content. - `Type BetaManagedAgentsSearchResultContentType` - `const BetaManagedAgentsSearchResultContentTypeText BetaManagedAgentsSearchResultContentType = "text"` - `Source string` The URL source of the search result. - `Title string` The title of the search result. - `Type BetaManagedAgentsSearchResultBlockType` - `const BetaManagedAgentsSearchResultBlockTypeSearchResult BetaManagedAgentsSearchResultBlockType = "search_result"` - `IsError bool` Whether the tool execution resulted in an error. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Routes this result to a subagent thread. Copy from the `agent.custom_tool_use` event's `session_thread_id`. - `type BetaManagedAgentsUserDefineOutcomeEvent struct{…}` Echo of a `user.define_outcome` input event. Carries the server-generated `outcome_id` that subsequent `span.outcome_evaluation_*` events reference. - `ID string` Unique identifier for this event. - `Description string` What the agent should produce. Copied from the input event. - `MaxIterations int64` Evaluate-then-revise cycles before giving up. Default 3, max 20. - `OutcomeID string` Server-generated `outc_` ID for this outcome. Referenced by `span.outcome_evaluation_*` events and the session's `outcome_evaluations` list. - `ProcessedAt Time` A timestamp in RFC 3339 format - `Rubric BetaManagedAgentsUserDefineOutcomeEventRubricUnion` Rubric for grading the quality of an outcome. - `type BetaManagedAgentsFileRubric struct{…}` Rubric referenced by a file uploaded via the Files API. - `FileID string` ID of the rubric file. - `Type BetaManagedAgentsFileRubricType` - `const BetaManagedAgentsFileRubricTypeFile BetaManagedAgentsFileRubricType = "file"` - `type BetaManagedAgentsTextRubric struct{…}` Rubric content provided inline as text. - `Content string` Rubric content. Plain text or markdown — the grader treats it as freeform text. - `Type BetaManagedAgentsTextRubricType` - `const BetaManagedAgentsTextRubricTypeText BetaManagedAgentsTextRubricType = "text"` - `Type BetaManagedAgentsUserDefineOutcomeEventType` - `const BetaManagedAgentsUserDefineOutcomeEventTypeUserDefineOutcome BetaManagedAgentsUserDefineOutcomeEventType = "user.define_outcome"` - `type BetaManagedAgentsUserToolResultEvent struct{…}` Event sent by the client providing the result of an agent-toolset tool execution. Only valid on `self_hosted` environments, where sandbox-routed tools are executed by the client rather than the server. - `ID string` Unique identifier for this event. - `ToolUseID string` The id of the `agent.tool_use` event this result corresponds to, which can be found in the last `session.status_idle` [event's](https://platform.claude.com/docs/en/api/beta/sessions/events/list#beta_managed_agents_session_requires_action.event_ids) `stop_reason.event_ids` field. - `Type BetaManagedAgentsUserToolResultEventType` - `const BetaManagedAgentsUserToolResultEventTypeUserToolResult BetaManagedAgentsUserToolResultEventType = "user.tool_result"` - `Content []BetaManagedAgentsUserToolResultEventContentUnion` The result content returned by the tool. - `type BetaManagedAgentsTextBlock struct{…}` Regular text content. - `type BetaManagedAgentsImageBlock struct{…}` Image content specified directly as base64 data or as a reference via a URL. - `type BetaManagedAgentsDocumentBlock struct{…}` Document content, either specified directly as base64 data, as text, or as a reference via a URL. - `type BetaManagedAgentsSearchResultBlock struct{…}` A block containing a web search result. - `IsError bool` Whether the tool execution resulted in an error. - `ProcessedAt Time` A timestamp in RFC 3339 format - `SessionThreadID string` Routes this result to a subagent thread. Copy from the `agent.tool_use` event's `session_thread_id`. - `type BetaManagedAgentsSystemMessageEvent struct{…}` 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 []BetaManagedAgentsSystemContentBlock` System content blocks. Text-only. - `Text string` The text content. - `Type BetaManagedAgentsSystemContentBlockType` - `const BetaManagedAgentsSystemContentBlockTypeText BetaManagedAgentsSystemContentBlockType = "text"` - `Type BetaManagedAgentsSystemMessageEventType` - `const BetaManagedAgentsSystemMessageEventTypeSystemMessage BetaManagedAgentsSystemMessageEventType = "system.message"` - `ProcessedAt Time` A timestamp in RFC 3339 format ### Example ```go package main import ( "context" "fmt" "github.com/anthropics/anthropic-sdk-go" "github.com/anthropics/anthropic-sdk-go/option" ) func main() { client := anthropic.NewClient( option.WithAPIKey("my-anthropic-api-key"), ) betaManagedAgentsSendSessionEvents, err := client.Beta.Sessions.Events.Send( context.TODO(), "sesn_011CZkZAtmR3yMPDzynEDxu7", anthropic.BetaSessionEventSendParams{ Events: []anthropic.BetaManagedAgentsEventParamsUnion{anthropic.BetaManagedAgentsEventParamsUnion{ OfUserMessage: &anthropic.BetaManagedAgentsUserMessageEventParams{ Content: []anthropic.BetaManagedAgentsUserMessageEventParamsContentUnion{anthropic.BetaManagedAgentsUserMessageEventParamsContentUnion{ OfText: &anthropic.BetaManagedAgentsTextBlockParam{ Text: "Where is my order #1234?", Type: anthropic.BetaManagedAgentsTextBlockTypeText, }, }}, Type: anthropic.BetaManagedAgentsUserMessageEventParamsTypeUserMessage, }, }}, }, ) if err != nil { panic(err.Error()) } fmt.Printf("%+v\n", betaManagedAgentsSendSessionEvents.Data) } ``` #### 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" } ] } ```