Beta Managed Agents System Message Event

• BetaManagedAgentsSystemMessageEvent object

  A mid-conversation system message event. Carries system-role content that is appended to the session as a role: "system" turn.

  • type: "system.message"

  • id: string

    Unique identifier for this event.

  • content: array of BetaManagedAgentsSystemContentBlock

    System content blocks. Text-only.

    • type: "text"

    • text: string

      The text content.

      minLength: 1

  • processed_at: optional string or null

    A timestamp in RFC 3339 format

    format: date-time