Practical MCP with FastMCP & LangChain

Ping (Client & Server Side)

The ping mechanism is a simple diagnostic tool used by either the client or the server to confirm that the other party is still connected and responsive. It acts as the "heartbeat" of the session.

Ping follows a standard request/response pattern. Unlike notifications, it requires a unique id and expects a formal reply.

Here is an example of a ping request:

{
  "jsonrpc": "2.0",
  "id": "ping_xyz123",
  "method": "ping"
}

And the corresponding response would be: