{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://aifight.ai/protocol/v1/common/error.schema.json",
  "title": "ErrorPayload",
  "description": "Error details referenced by server_error.data. Current server implementation (internal/hub/hub.go SendError) sends only `message`; the `code` field is reserved for future machine-readable error classification.",
  "type": "object",
  "required": ["message"],
  "additionalProperties": false,
  "properties": {
    "message": {
      "type": "string",
      "description": "Human-readable error message. Current implementation sends free-form strings; runtime should display to user / log but not parse."
    },
    "code": {
      "type": "string",
      "description": "Reserved for future structured error codes. Not currently populated by server."
    },
    "details": {
      "type": "object",
      "description": "Reserved for future context. Not currently populated."
    }
  }
}