{
  "a2a": [
    {
      "message_type": "document.route.request",
      "schema": {
        "type": "object",
        "properties": {
          "docId": {
            "type": "string"
          },
          "targetRole": {
            "type": "string"
          }
        },
        "required": [
          "docId",
          "targetRole"
        ]
      }
    }
  ]
}