### 1 · GetTask: full history
POST /a2a/jsonrpc HTTP/1.1
Host: localhost:41242
Content-Type: application/json
A2A-Version: 1.0

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "GetTask",
  "params": {
    "id": "e5c95b09-6d4b-4b3b-8693-91e81472d12f"
  }
}

HTTP/1.1 200 OK
Content-Type: application/json

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "id": "e5c95b09-6d4b-4b3b-8693-91e81472d12f",
    "contextId": "49c5a238-4158-455d-8d63-b2cb39c0ecac",
    "status": {
      "state": "TASK_STATE_COMPLETED",
      "message": {
        "messageId": "cdf017cb-27ab-4cd1-9b83-6d0995c9da8b",
        "contextId": "49c5a238-4158-455d-8d63-b2cb39c0ecac",
        "taskId": "e5c95b09-6d4b-4b3b-8693-91e81472d12f",
        "role": "ROLE_AGENT",
        "parts": [
          {
            "text": "2 findings"
          }
        ]
      },
      "timestamp": "2026-10-06T09:00:01.250Z"
    },
    "history": [
      {
        "messageId": "14a03569-d26b-4496-92e5-dfe8cb1855fe",
        "contextId": "49c5a238-4158-455d-8d63-b2cb39c0ecac",
        "taskId": "e5c95b09-6d4b-4b3b-8693-91e81472d12f",
        "role": "ROLE_USER",
        "parts": [
          {
            "text": "Review this diff of payments-api."
          },
          {
            "raw": "LS0tIGEvcGF5bWVudHMvcmVmdW5kcy5weQorKysgYi9wYXltZW50cy9yZWZ1bmRzLnB5CkBAIC00MCwzICs0MCw0IEBAIGRlZiBwYXJ0aWFsX3JlZnVuZChjaGFyZ2UsIGFtb3VudCk6Ci0gICAgbmV0ID0gYW1vdW50IC0gZmVlKGNoYXJnZSkKKyAgICBuZXQgPSBpbnQoYW1vdW50KSAtIGZlZShjaGFyZ2UpCg==",
            "filename": "refunds.diff",
            "mediaType": "text/x-diff"
          }
        ]
      },
      {
        "messageId": "46494a30-e224-4d71-8d6f-50c110597e3b",
        "contextId": "49c5a238-4158-455d-8d63-b2cb39c0ecac",
        "taskId": "e5c95b09-6d4b-4b3b-8693-91e81472d12f",
        "role": "ROLE_AGENT",
        "parts": [
          {
            "text": "Which base branch should I compare this diff against?"
          }
        ]
      },
      {
        "messageId": "096d3737-42f9-4039-8320-a4737c2b3abe",
        "contextId": "49c5a238-4158-455d-8d63-b2cb39c0ecac",
        "taskId": "e5c95b09-6d4b-4b3b-8693-91e81472d12f",
        "role": "ROLE_USER",
        "parts": [
          {
            "text": "main"
          }
        ]
      },
      {
        "messageId": "8f9ee658-e185-409a-9294-8d4d97ef77bb",
        "contextId": "49c5a238-4158-455d-8d63-b2cb39c0ecac",
        "taskId": "e5c95b09-6d4b-4b3b-8693-91e81472d12f",
        "role": "ROLE_AGENT",
        "parts": [
          {
            "text": "Comparing the diff against main"
          }
        ]
      }
    ],
    "artifacts": [
      {
        "artifactId": "review",
        "name": "review.json",
        "parts": [
          {
            "text": "2 findings in payments/refunds.py"
          },
          {
            "data": {
              "base": "main",
              "findings": [
                {
                  "file": "payments/refunds.py",
                  "line": 42,
                  "severity": "high",
                  "finding": "Partial refunds round the amount down before the fee is subtracted."
                },
                {
                  "file": "payments/refunds.py",
                  "line": 57,
                  "severity": "low",
                  "finding": "The new branch has no test."
                }
              ]
            },
            "mediaType": "application/json"
          }
        ]
      }
    ]
  }
}

### 2 · GetTask: last message only
POST /a2a/jsonrpc HTTP/1.1
Host: localhost:41242
Content-Type: application/json
A2A-Version: 1.0

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "GetTask",
  "params": {
    "id": "e5c95b09-6d4b-4b3b-8693-91e81472d12f",
    "historyLength": 1
  }
}

HTTP/1.1 200 OK
Content-Type: application/json

{
  "jsonrpc": "2.0",
  "id": 2,
  "result": {
    "id": "e5c95b09-6d4b-4b3b-8693-91e81472d12f",
    "contextId": "49c5a238-4158-455d-8d63-b2cb39c0ecac",
    "status": {
      "state": "TASK_STATE_COMPLETED",
      "message": {
        "messageId": "cdf017cb-27ab-4cd1-9b83-6d0995c9da8b",
        "contextId": "49c5a238-4158-455d-8d63-b2cb39c0ecac",
        "taskId": "e5c95b09-6d4b-4b3b-8693-91e81472d12f",
        "role": "ROLE_AGENT",
        "parts": [
          {
            "text": "2 findings"
          }
        ]
      },
      "timestamp": "2026-10-06T09:00:01.250Z"
    },
    "history": [
      {
        "messageId": "8f9ee658-e185-409a-9294-8d4d97ef77bb",
        "contextId": "49c5a238-4158-455d-8d63-b2cb39c0ecac",
        "taskId": "e5c95b09-6d4b-4b3b-8693-91e81472d12f",
        "role": "ROLE_AGENT",
        "parts": [
          {
            "text": "Comparing the diff against main"
          }
        ]
      }
    ],
    "artifacts": [
      {
        "artifactId": "review",
        "name": "review.json",
        "parts": [
          {
            "text": "2 findings in payments/refunds.py"
          },
          {
            "data": {
              "base": "main",
              "findings": [
                {
                  "file": "payments/refunds.py",
                  "line": 42,
                  "severity": "high",
                  "finding": "Partial refunds round the amount down before the fee is subtracted."
                },
                {
                  "file": "payments/refunds.py",
                  "line": 57,
                  "severity": "low",
                  "finding": "The new branch has no test."
                }
              ]
            },
            "mediaType": "application/json"
          }
        ]
      }
    ]
  }
}