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.

One of the following:

class BetaManagedAgentsUserMessageEventParams { content, type }

Parameters for sending a user message to the session.

class BetaManagedAgentsUserInterruptEventParams { type, session_thread_id }

Parameters for sending an interrupt to pause the agent.

type: :"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 { result, tool_use_id, type, deny_message }

Parameters for confirming or denying a tool execution request.

result: :allow | :deny

UserToolConfirmationResult enum

One of the following:

: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 stop_reason.event_ids field.

minLength1

maxLength128

type: :"user.tool_confirmation"

deny_message: String

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

maxLength10000

class BetaManagedAgentsUserCustomToolResultEventParams { custom_tool_use_id, type, content, is_error }

Parameters for providing the result of a custom tool execution.

class BetaManagedAgentsUserDefineOutcomeEventParams { description, rubric, type, max_iterations }

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

class BetaManagedAgentsUserToolResultEventParams { tool_use_id, type, content, is_error }

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 { content, type }

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 { text, type }]

System content blocks to append. Text-only.

text: String

The text content.

minLength1

type: :text

type: :"system.message"

betas: Array[AnthropicBeta]

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

One of the following:

String = String

AnthropicBeta = :"message-batches-2024-09-24" | :"prompt-caching-2024-07-31" | :"computer-use-2024-10-22" | 38 more

One of the following:

:"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"

:"user-profiles-2026-08-18"

:"advisor-tool-2026-03-01"

:"managed-agents-2026-04-01"

:"cache-diagnosis-2026-04-07"

:"dreaming-2026-04-21"

:"thinking-token-count-2026-05-13"

:"server-side-fallback-2026-06-01"

:"server-side-fallback-2026-07-01"

:"fallback-credit-2026-06-01"

:"fallback-credit-2026-07-01"

:"agent-memory-2026-07-22"

:"mid-conversation-tool-changes-2026-07-01"

:"compact-2026-01-12"

:"computer-use-2025-11-24"

:"mcp-tunnels-2026-06-22"

:"structured-outputs-2025-11-13"

:"task-budgets-2026-03-13"

:"thinking-display-updates-2026-08-18"

:"ce-user-management-2026-07-13"

Returns

class BetaManagedAgentsSendSessionEvents { data }

Events that were successfully sent to the session.

Send Events

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)

{
  "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

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