# JSON-RPC (llmcpp)

**JSON-RPC** identifies requests and their replies. An external agent can call the compiler's `get_task` tool using this JSON-RPC 2.0 message:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_task",
    "arguments": {}
  }
}
```

The method selects an MCP operation; its parameters select the compiler tool. The response carries the same `id`, allowing the agent to match it to this request. The actual stream carries each message as one line; the example is expanded for readability.

The separate `llm/generate` request asks the agent to implement a target. Tool requests can occur while that request remains active. Notifications, such as initialization completion, omit the request identifier because they do not expect a reply.