type: object
description: |
  WebSocket error message envelope.

  Sent when a request fails. Contains the request ID and error details.
required:
  - id
  - error
properties:
  id:
    type: string
    description: |
      Request identifier from the original request that failed.
    examples:
      - req-123
      - request-abc-456
  error:
    type: object
    description: Error information
    required:
      - type
      - message
    properties:
      type:
        type: string
        description: Error type/category
        examples:
          - gateway-error
          - service-error
          - timeout
      message:
        type: string
        description: Human-readable error message
        examples:
          - Flow not found
          - Service timeout
          - Invalid request format