POST /
{
  "jsonrpc": "2.0",
  "id": "1",
  "method": "SendMessage",
  "params": {
    "message": {
      "messageId": "m-1",
      "role": "ROLE_USER",
      "parts": [
        {
          "text": "record"
        }
      ]
    },
    "configuration": {
      "blocking": true
    }
  }
}

Response:
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "task": {
      "id": "<id-1>",
      "contextId": "<id-2>",
      "status": {
        "state": "TASK_STATE_COMPLETED",
        "timestamp": "<time>"
      },
      "artifacts": [
        {
          "artifactId": "definition",
          "name": "definition",
          "description": "",
          "parts": [
            {
              "text": "A record is a final class that is a transparent",
              "metadata": {},
              "filename": "",
              "mediaType": ""
            },
            {
              "text": " carrier for its components.",
              "metadata": {},
              "filename": "",
              "mediaType": ""
            }
          ],
          "metadata": {},
          "extensions": []
        }
      ],
      "history": [],
      "metadata": {}
    }
  }
}