{
  "type": "init",
  "payload": {
    "model": "claude-sonnet-4-5-20250929",
    "systemPrompt": "You are a helpful assistant.",
    "maxTurns": 10,
    "tools": [],
    "mcpServers": []
  }
}

{
  "type": "prompt",
  "payload": {
    "message": "What is 2 + 2?",
    "model": "claude-sonnet-4-5-20250929"
  }
}

{
  "type": "sdk_message",
  "payload": {
    "type": "user",
    "message": "Hello, Claude!"
  }
}

{
  "type": "tool_result",
  "payload": {
    "callId": "call_abc123",
    "result": {
      "content": [
        { "type": "text", "text": "Result data" }
      ],
      "isError": false
    }
  }
}

{
  "type": "control",
  "payload": {
    "action": "close"
  }
}

{
  "type": "ping",
  "payload": {
    "timestamp": 1704067200000
  }
}

{
  "type": "control",
  "payload": {
    "action": "ready",
    "data": {
      "sessionId": "session_abc123"
    }
  }
}

{
  "type": "sdk_message",
  "payload": {
    "type": "assistant",
    "subtype": "text",
    "text": "Hello! "
  }
}

{
  "type": "tool_call",
  "payload": {
    "id": "call_abc123",
    "name": "get_weather",
    "input": {
      "city": "Paris"
    }
  }
}

{
  "type": "result",
  "payload": {
    "type": "result",
    "subtype": "success",
    "text": "The answer is 4.",
    "total_cost_usd": 0.0012,
    "duration_secs": 1.5,
    "session_id": "session_abc123",
    "usage": {
      "input_tokens": 50,
      "output_tokens": 20
    }
  }
}

{
  "type": "error",
  "payload": {
    "code": "BUDGET_EXCEEDED",
    "message": "AI budget exceeded for this period",
    "details": {
      "budgetType": "ai",
      "used": 1000000,
      "limit": 1000000
    }
  }
}

{
  "type": "pong",
  "payload": {
    "timestamp": 1704067200000
  }
}