{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://git.eeqj.de/sneak/chat/schema/c2s/ping.json",
  "title": "C2S Ping",
  "description": "Client keepalive. Server responds with a pong.",
  "type": "object",
  "properties": {
    "token": {
      "type": "string",
      "description": "Optional opaque token echoed back in the pong response."
    }
  },
  "additionalProperties": false
}