overlay: 1.0.0
info:
  title: API Evangelist enhancements — Finalcad One Libraries API
  version: 1.0.0
extends: ../openapi/finalcad-libraries-openapi.yml
x-generated: '2026-08-17'
x-method: generated
x-source: openapi/finalcad-libraries-openapi.yml, conventions/finalcad-conventions.yml
x-note: Captures API Evangelist's enhancements over the derived contract without mutating it — the cross-cutting
  semantics Finalcad documents in prose (idempotency posture, pagination and change feed, error envelope, Accept-Language)
  plus the deprecations Finalcad announces in release notes but never encodes. 5 paths in the target document.
actions:
- target: $.info
  description: Record that the contract is a derivation of the provider's Postman collection, not a provider-published
    OpenAPI.
  update:
    x-api-evangelist:
      profile: https://apis.io/provider/finalcad
      derived-from: collections/finalcad.postman_collection.json
      provider-publishes-openapi: false
- target: $.info
  description: Attach the cross-cutting semantics Finalcad documents in prose but does not encode in any contract.
  update:
    x-conventions:
      idempotency:
        supported: false
        retry-signal: api_code suffix — _ERR{n} rolled back (safe to replay), _WRN{n} did not (replay duplicates)
        partial-success-status: 206
      pagination:
        style: cursor+offset
        cursor-param: continuous_token
        response-fields:
        - need_to_relaunch
        - continuous_token
        - count
        - total_count
        default-limit: 50
        offset-constraint: offset must be a multiple of limit
        doubles-as-change-feed: true
      rate-limits:
        published: false
        headers: []
      error-envelope:
        rfc9457: false
        fields:
        - statut
        - api_code
        - message
        - data
        gateway-shape: '{"message": "..."} with no api_code on 401/403'
      detail: conventions/finalcad-conventions.yml
- target: $.components.parameters
  description: Declare the Accept-Language header Finalcad documents globally under 'Language selection'.
  update:
    AcceptLanguage:
      name: Accept-Language
      in: header
      required: false
      schema:
        type: string
        default: en
      description: Language the API operates in. Allowed values come from GET /languages. Default English (en).
- target: $.paths.*.*
  description: Every operation accepts the documented Accept-Language header.
  update:
    x-accepts-language: true
- target: $.paths.*.get
  description: Mark reads as agent-safe; writes are deliberately left unmarked because there is no idempotency key.
  update:
    x-agentic-access:
      action-class: read
      consequence: connected