API Evangelist enhancements for the ITU Proximity to Fibre Node API

overlay: 1.0.0
info:
  title: API Evangelist enhancements for the ITU Proximity to Fibre Node API
  version: 1.0.0
extends: openapi/itu-proximity-openapi.yml
x-apievangelist-note: >-
  ITU presents this API as a demonstration on a single ITU-D page with no reference documentation.
  The document this overlay extends was derived by API Evangelist from that page, from ITU's public
  web client, and from confirmed live calls. This overlay carries the operating annotations.
actions:
- target: $.info
  update:
    x-apievangelist-provenance: derived from ITU's demonstration page + public web client + live confirmed calls, 2026-07-26
    x-apievangelist-stability: demonstration — ITU's own wording; may be withdrawn without notice
    x-apievangelist-support: none published
- target: $.info
  update:
    x-apievangelist-artifacts:
      authentication: authentication/itu-authentication.yml
      conventions: conventions/itu-conventions.yml
      errors: errors/itu-problem-types.yml
      sandbox: sandbox/itu-sandbox.yml
      skills: skills/_index.yml
- target: $.components.securitySchemes.functionKey
  update:
    x-apievangelist-key-warning: >-
      The function key is embedded in ITU's public web client, so it is a shared demonstration
      credential rather than a per-consumer secret. There is no signup, no rotation policy, and no
      notice channel — an integration will break silently if ITU rotates it.
- target: $.paths['/route-calcdistancetonode'].post
  update:
    x-apievangelist-async-warning: >-
      Batch-in / artifact-out. The response is a bare URL to a generated ZIP; there is no job id, no
      status endpoint, no callback, and no documented retention for the artifact. Fetch the ZIP
      immediately and persist it yourself.
    x-apievangelist-error-warning: >-
      A malformed CSV returns HTTP 500, not 400. A missing or invalid ?code= returns HTTP 401 with
      an empty body.
- target: $.paths['/route-calc10kmintersection'].post
  update:
    x-apievangelist-async-warning: >-
      Same batch-in / artifact-out contract as calcDistanceToNode. Output column is `in10km`
      (0 = no, 1 = yes) per ITU's own client.