Initialize a new MCP session. This must be called before using any tools. Send a POST request to the MCP endpoint with method: "initialize" in the JSON-RPC body. The session ID should be generated as a UUID and included in the mcp-session-id header for all subsequent requests.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
MCP session identifier (UUID). Generate a new UUID for session initialization.