Beta Managed Agents Agent Custom Tool Use Event

• BetaManagedAgentsAgentCustomToolUseEvent object

  Event emitted when the agent calls a custom tool. The session goes idle until the client sends a user.custom_tool_result event with the result.

  • type: "agent.custom_tool_use"

  • id: string

    Unique identifier for this event.

  • input: map[unknown]

    Input parameters for the tool call.

  • name: string

    Name of the custom tool being called.

  • processed_at: string

    A timestamp in RFC 3339 format

    format: date-time

  • session_thread_id: optional string or null

    When set, this event was cross-posted from a subagent's thread to surface its custom tool use on the primary thread's stream. Empty on the thread's own events. Echo this on a user.custom_tool_result event to route the result back.