### 1 · GetTask: an id that does not exist
POST /a2a/jsonrpc HTTP/1.1
Host: localhost:41241
Content-Type: application/json
A2A-Version: 1.0

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "GetTask",
  "params": {
    "id": "00000000-0000-4000-8000-000000000000"
  }
}

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32001,
    "message": "Task not found",
    "data": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "reason": "TASK_NOT_FOUND",
        "domain": "a2a-protocol.org",
        "metadata": {
          "taskId": "00000000-0000-4000-8000-000000000000"
        }
      }
    ]
  }
}

### 2 · SendMessage: no A2A-Version header
POST /a2a/jsonrpc HTTP/1.1
Host: localhost:41241
Content-Type: application/json

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "SendMessage",
  "params": {
    "message": {
      "messageId": "db5b5fab-8f4d-4e27-9da1-494c73cf256d",
      "role": "ROLE_USER",
      "parts": [
        {
          "text": "Run the unit tests"
        }
      ]
    }
  }
}

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

{
  "jsonrpc": "2.0",
  "id": 2,
  "error": {
    "code": -32009,
    "message": "Protocol version not supported",
    "data": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "reason": "VERSION_NOT_SUPPORTED",
        "domain": "a2a-protocol.org",
        "metadata": {
          "requested": "0.3 (no header)",
          "supported": "1.0"
        }
      }
    ]
  }
}

### 3 · SendMessage: a v0.3 method name
POST /a2a/jsonrpc HTTP/1.1
Host: localhost:41241
Content-Type: application/json
A2A-Version: 1.0

{
  "jsonrpc": "2.0",
  "id": 3,
  "method": "message/send",
  "params": {
    "message": {
      "messageId": "73ab4876-7734-47c1-87fd-e805ec99108d",
      "role": "ROLE_USER",
      "parts": [
        {
          "text": "Run the unit tests"
        }
      ]
    }
  }
}

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

{
  "jsonrpc": "2.0",
  "id": 3,
  "error": {
    "code": -32601,
    "message": "Method not found"
  }
}

### 4 · SendMessage: no messageId
POST /a2a/jsonrpc HTTP/1.1
Host: localhost:41241
Content-Type: application/json
A2A-Version: 1.0

{
  "jsonrpc": "2.0",
  "id": 4,
  "method": "SendMessage",
  "params": {
    "message": {
      "role": "ROLE_USER",
      "parts": [
        {
          "text": "Run the unit tests"
        }
      ]
    }
  }
}

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

{
  "jsonrpc": "2.0",
  "id": 4,
  "error": {
    "code": -32602,
    "message": "Invalid parameters",
    "data": [
      {
        "@type": "type.googleapis.com/google.rpc.BadRequest",
        "fieldViolations": [
          {
            "field": "message.messageId",
            "description": "messageId is required"
          }
        ]
      }
    ]
  }
}

### 5 · SendMessage: an image part
POST /a2a/jsonrpc HTTP/1.1
Host: localhost:41242
Content-Type: application/json
A2A-Version: 1.0

{
  "jsonrpc": "2.0",
  "id": 5,
  "method": "SendMessage",
  "params": {
    "message": {
      "messageId": "309d6b79-965e-4a32-9ae4-45508201e2bd",
      "role": "ROLE_USER",
      "parts": [
        {
          "url": "https://example.com/screenshot.png",
          "mediaType": "image/png"
        }
      ]
    }
  }
}

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

{
  "jsonrpc": "2.0",
  "id": 5,
  "error": {
    "code": -32005,
    "message": "Content type not supported",
    "data": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "reason": "CONTENT_TYPE_NOT_SUPPORTED",
        "domain": "a2a-protocol.org",
        "metadata": {
          "mediaType": "image/png"
        }
      }
    ]
  }
}

### 6 · CreateTaskPushNotificationConfig: not supported
POST /a2a/jsonrpc HTTP/1.1
Host: localhost:41242
Content-Type: application/json
A2A-Version: 1.0

{
  "jsonrpc": "2.0",
  "id": 6,
  "method": "CreateTaskPushNotificationConfig",
  "params": {
    "taskId": "00000000-0000-4000-8000-000000000000",
    "url": "http://localhost:41250/a2a-events"
  }
}

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

{
  "jsonrpc": "2.0",
  "id": 6,
  "error": {
    "code": -32003,
    "message": "Push notifications are not supported",
    "data": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "reason": "PUSH_NOTIFICATION_NOT_SUPPORTED",
        "domain": "a2a-protocol.org"
      }
    ]
  }
}

### 7 · a malformed body
POST /a2a/jsonrpc HTTP/1.1
Host: localhost:41241
Content-Type: application/json
A2A-Version: 1.0

{"jsonrpc": "2.0", "method": 

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

{
  "jsonrpc": "2.0",
  "id": null,
  "error": {
    "code": -32700,
    "message": "Invalid JSON payload"
  }
}