{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://aifight.ai/protocol/v1/messages/server_error.schema.json",
  "title": "error",
  "description": "Sent by the server when it cannot process a client message (invalid format, bad match_id, unknown message type, matchmaking gate denied, etc.). Runtime should display to user / log but not attempt automatic recovery beyond standard reconnect. Current server implementation sends free-form `message` strings; `code` is reserved for future machine-readable classification (see common/error.schema.json).",
  "type": "object",
  "required": ["type", "data"],
  "additionalProperties": false,
  "properties": {
    "type": { "const": "error" },
    "data": {
      "$ref": "../common/error.schema.json"
    },
    "match_id": { "type": "string" }
  }
}