Beta Managed Agents System Message Event Params

• BetaManagedAgentsSystemMessageEventParams object

  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.

  • type: "system.message"

  • content: array of BetaManagedAgentsSystemContentBlock

    System content blocks to append. Text-only.

    • type: "text"

    • text: string

      The text content.

      minLength: 1