description: Error response
content:
  application/json:
    schema:
      type: object
      properties:
        error:
          oneOf:
            - type: string
              description: Simple error message
            - $ref: '../schemas/errors/ErrorObject.yaml'
              description: Structured error with type and message
    examples:
      simpleError:
        summary: Simple error message
        value:
          error: Invalid flow ID
      structuredError:
        summary: Structured error
        value:
          error:
            type: gateway-error
            message: Timeout