Create a new brand agent (advertiser account). This creates the top-level container that will own campaigns, creatives, audiences, standards, and measurement sources.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
MCP session identifier (UUID). Initialize your session by sending a POST request to this endpoint with method: "initialize" in the JSON-RPC body, then reuse the same session ID for all subsequent tool requests.
Request body for brand_agent_create