### 1 · agent card
GET /.well-known/agent-card.json HTTP/1.1
Host: 127.0.0.1:8082

HTTP/1.1 200 OK
Access-Control-Allow-Origin: *
Content-Type: application/json
Date: <http-date>

{
  "supportedInterfaces": [
    {
      "url": "http://127.0.0.1:8082/invoke",
      "protocolBinding": "JSONRPC",
      "protocolVersion": "1.0"
    }
  ],
  "capabilities": {
    "streaming": true
  },
  "defaultInputModes": [],
  "defaultOutputModes": [],
  "description": "Answers every message with the word pong.",
  "name": "pong",
  "skills": [
    {
      "description": "Answers every message with the word pong.",
      "id": "pong_",
      "name": "",
      "tags": [
        "llm",
        "docker agent"
      ]
    }
  ],
  "version": "v1.149.0"
}

### 2 · SendMessage (A2A 1.0 names)
POST /invoke HTTP/1.1
Host: 127.0.0.1:8082
A2A-Version: 1.0
Content-Type: application/json

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "SendMessage",
  "params": {
    "message": {
      "messageId": "m101-0001",
      "role": "ROLE_USER",
      "parts": [
        {
          "text": "ping"
        }
      ]
    }
  }
}

HTTP/1.1 200 OK
Content-Type: application/json
Date: <http-date>

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "task": {
      "id": "<uuid>",
      "artifacts": [
        {
          "artifactId": "<uuid>",
          "metadata": {
            "adk_partial": true
          },
          "parts": [
            {
              "data": {},
              "metadata": {
                "adk_partial": true
              }
            }
          ]
        },
        {
          "artifactId": "<uuid>",
          "parts": [
            {
              "text": "pong"
            }
          ]
        }
      ],
      "contextId": "<uuid>",
      "history": [
        {
          "messageId": "m101-0001",
          "parts": [
            {
              "text": "ping"
            }
          ],
          "role": "ROLE_USER"
        }
      ],
      "metadata": {
        "adk_app_name": "pong",
        "adk_session_id": "<uuid>",
        "adk_user_id": "A2A_USER_<uuid>",
        "https://google.github.io/adk-docs/a2a/a2a-extension/": true
      },
      "status": {
        "state": "TASK_STATE_COMPLETED",
        "timestamp": "<ts>"
      }
    }
  }
}

### 3 · GetTask
POST /invoke HTTP/1.1
Host: 127.0.0.1:8082
A2A-Version: 1.0
Content-Type: application/json

{
  "jsonrpc": "2.0",
  "id": 3,
  "method": "GetTask",
  "params": {
    "id": "<uuid>"
  }
}

HTTP/1.1 200 OK
Content-Type: application/json
Date: <http-date>

{
  "jsonrpc": "2.0",
  "id": 3,
  "result": {
    "id": "<uuid>",
    "artifacts": [
      {
        "artifactId": "<uuid>",
        "metadata": {
          "adk_partial": true
        },
        "parts": [
          {
            "data": {},
            "metadata": {
              "adk_partial": true
            }
          }
        ]
      },
      {
        "artifactId": "<uuid>",
        "parts": [
          {
            "text": "pong"
          }
        ]
      }
    ],
    "contextId": "<uuid>",
    "history": [
      {
        "messageId": "m101-0001",
        "parts": [
          {
            "text": "ping"
          }
        ],
        "role": "ROLE_USER"
      }
    ],
    "metadata": {
      "adk_app_name": "pong",
      "adk_session_id": "<uuid>",
      "adk_user_id": "A2A_USER_<uuid>",
      "https://google.github.io/adk-docs/a2a/a2a-extension/": true
    },
    "status": {
      "state": "TASK_STATE_COMPLETED",
      "timestamp": "<ts>"
    }
  }
}