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BetaManagedAgentsSendSessionEvents Beta.Sessions.Events.Send(parameters, cancellationToken = default)

POST/v1/sessions/{session_id}/events

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Parameters

EventSendParams parameters

required string sessionID

Path param: Path parameter session_id

required IReadOnlyList<BetaManagedAgentsEventParams> events

Body param: Events to send to the session.

class BetaManagedAgentsUserMessageEventParams { Type; Content; }

Parameters for sending a user message to the session.

class BetaManagedAgentsUserInterruptEventParams { Type; SessionThreadID; }

Parameters for sending an interrupt to pause the agent.

required Type Type

string? 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 BetaManagedAgentsUserToolConfirmationEventParams { Type; Result; ToolUseID; DenyMessage; }

Parameters for confirming or denying a tool execution request.

required Type Type

required Result Result

UserToolConfirmationResult enum

One of the following:

Allow("allow")

Deny("deny")

required 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 stop_reason.event_ids field.

minLength1

maxLength128

string? DenyMessage

Optional message providing context for a 'deny' decision. Only allowed when result is 'deny'.

maxLength10000

class BetaManagedAgentsUserCustomToolResultEventParams { Type; CustomToolUseID; Content; IsError; }

Parameters for providing the result of a custom tool execution.

class BetaManagedAgentsUserDefineOutcomeEventParams { Type; Description; Rubric; MaxIterations; }

Parameters for defining an outcome the agent should work toward. The agent begins work on receipt.

required Type Type

required string Description

What the agent should produce. This is the task specification.

required Rubric Rubric

Rubric for grading the quality of an outcome.

One of the following:

class BetaManagedAgentsFileRubricParams { Type; FileID; }

Rubric referenced by a file uploaded via the Files API.

required Type Type

required string FileID

ID of the rubric file.

class BetaManagedAgentsTextRubricParams { Type; Content; }

Rubric content provided inline as text.

required Type Type

required string Content

Rubric content. Plain text or markdown — the grader treats it as freeform text. Maximum 262144 characters.

maxLength262144

int? MaxIterations

Eval→revision cycles before giving up. Default 3, max 20.

formatint32

class BetaManagedAgentsUserToolResultEventParams { Type; ToolUseID; Content; IsError; }

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.

class BetaManagedAgentsSystemMessageEventParams { Type; Content; }

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.

required Type Type

required IReadOnlyList<BetaManagedAgentsSystemContentBlock> Content

System content blocks to append. Text-only.

required Type Type

required string Text

The text content.

minLength1

IReadOnlyList<AnthropicBeta> betas

Header param: Optional header to specify the beta version(s) you want to use.

MessageBatches2024_09_24("message-batches-2024-09-24")

PromptCaching2024_07_31("prompt-caching-2024-07-31")

ComputerUse2024_10_22("computer-use-2024-10-22")

ComputerUse2025_01_24("computer-use-2025-01-24")

Pdfs2024_09_25("pdfs-2024-09-25")

TokenCounting2024_11_01("token-counting-2024-11-01")

TokenEfficientTools2025_02_19("token-efficient-tools-2025-02-19")

Output128k2025_02_19("output-128k-2025-02-19")

FilesApi2025_04_14("files-api-2025-04-14")

McpClient2025_04_04("mcp-client-2025-04-04")

McpClient2025_11_20("mcp-client-2025-11-20")

DevFullThinking2025_05_14("dev-full-thinking-2025-05-14")

InterleavedThinking2025_05_14("interleaved-thinking-2025-05-14")

CodeExecution2025_05_22("code-execution-2025-05-22")

ExtendedCacheTtl2025_04_11("extended-cache-ttl-2025-04-11")

Context1m2025_08_07("context-1m-2025-08-07")

ContextManagement2025_06_27("context-management-2025-06-27")

ModelContextWindowExceeded2025_08_26("model-context-window-exceeded-2025-08-26")

Skills2025_10_02("skills-2025-10-02")

FastMode2026_02_01("fast-mode-2026-02-01")

Output300k2026_03_24("output-300k-2026-03-24")

UserProfiles2026_03_24("user-profiles-2026-03-24")

UserProfiles2026_08_18("user-profiles-2026-08-18")

UserProfiles2026_09_04("user-profiles-2026-09-04")

AdvisorTool2026_03_01("advisor-tool-2026-03-01")

ManagedAgents2026_04_01("managed-agents-2026-04-01")

CacheDiagnosis2026_04_07("cache-diagnosis-2026-04-07")

Dreaming2026_04_21("dreaming-2026-04-21")

ThinkingTokenCount2026_05_13("thinking-token-count-2026-05-13")

ServerSideFallback2026_06_01("server-side-fallback-2026-06-01")

ServerSideFallback2026_07_01("server-side-fallback-2026-07-01")

FallbackCredit2026_06_01("fallback-credit-2026-06-01")

FallbackCredit2026_07_01("fallback-credit-2026-07-01")

AgentMemory2026_07_22("agent-memory-2026-07-22")

MidConversationToolChanges2026_07_01("mid-conversation-tool-changes-2026-07-01")

Compact2026_01_12("compact-2026-01-12")

ComputerUse2025_11_24("computer-use-2025-11-24")

McpTunnels2026_06_22("mcp-tunnels-2026-06-22")

StructuredOutputs2025_11_13("structured-outputs-2025-11-13")

TaskBudgets2026_03_13("task-budgets-2026-03-13")

ThinkingDisplayUpdates2026_08_18("thinking-display-updates-2026-08-18")

CEUserManagement2026_07_13("ce-user-management-2026-07-13")

MidConversationOutputConfig2026_07_01("mid-conversation-output-config-2026-07-01")

ThinkingBindingControls2026_08_01("thinking-binding-controls-2026-08-01")

MidConversationSystemClearAt2026_08_21("mid-conversation-system-clear-at-2026-08-21")

Compact2026_09_04("compact-2026-09-04")

string workspaceID

Header param: 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

class BetaManagedAgentsSendSessionEvents { Data; }

Events that were successfully sent to the session.

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EventSendParams parameters = new()
{
    SessionID = "sesn_011CZkZAtmR3yMPDzynEDxu7",
    Events =
    [
        new BetaManagedAgentsUserMessageEventParams()
        {
            Content =
            [
                new BetaManagedAgentsTextBlock()
                {
                    Text = "Where is my order #1234?",
                    Type = Type.Text,
                },
            ],
            Type = Type.UserMessage,
        },
    ],
};

var betaManagedAgentsSendSessionEvents = await client.Beta.Sessions.Events.Send(parameters);

Console.WriteLine(betaManagedAgentsSendSessionEvents);

Response 200

{
  "data": [
    {
      "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy",
      "content": [
        {
          "text": "Where is my order #1234?",
          "type": "text"
        }
      ],
      "type": "user.message",
      "processed_at": "2026-03-15T10:00:00Z"
    }
  ]
}

Returns Examples

Response 200

{
  "data": [
    {
      "id": "sevt_011CZkZGOp0iBcp4kaQSihUmy",
      "content": [
        {
          "text": "Where is my order #1234?",
          "type": "text"
        }
      ],
      "type": "user.message",
      "processed_at": "2026-03-15T10:00:00Z"
    }
  ]
}