Cancelling a Call Tool Request from Client

[asheshvidyut]

Question

Hey Team,
I have a question regarding cancelling the tool call from client when the MCP server is created from FastMCP class.

I see the test - test_cancel_handling but this one uses low level server.

My question is specifically on how we can get the request_id which the client needs for cancelling the call tool request on server.

await client.send_notification(
        ClientNotification(
            CancelledNotification(
                params=CancelledNotificationParams(
                    requestId={request_id},
                    reason="Reson",
              ),
          )
     )
)

Do we have to get the request id from call_tool request? like below?

  request_id = None
  mcp = FastMCP(
      name="Simple gRPC Server",
  )
  @mcp.tool()
  def get_temperature(city: str, ctx: Context[ServerSession, None]) -> float:
      # fetching request id from context 
      request_id = ctx.request_context.request_id
      return 22.5
  

Or is there another way?

Additional Context

No response