curl --request POST \
  --url http://localhost:8080/mcp \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "<string>",
  "params": {},
  "id": "<string>"
}
'

{
  "jsonrpc": "2.0",
  "result": {},
  "error": {
    "code": 123,
    "message": "<string>"
  },
  "id": "<string>"
}