API Evangelist enrichment overlay — Microsoft Graph ChangeNotifications

overlay: 1.0.0
info:
  title: API Evangelist enrichment overlay — Microsoft Graph ChangeNotifications
  version: 1.0.0
extends: ../openapi/_original/azure-ad-graph-changenotifications-openapi.yml
x-provenance:
  generated: '2026-09-06'
  method: generated
  source: Derived from the artifacts in all/azure-ad/; the underlying OpenAPI is Microsoft's and is never
    mutated.
  note: This overlay records API Evangelist enrichment on top of the harvested first-party spec. It adds
    runtime semantics Microsoft documents in prose but does not express in the contract — the error envelope,
    the throttling model and its missing Retry-After header, the absence of an idempotency key, and the
    30-day soft-delete reversal window.
actions:
- target: $.info
  description: Attach the runtime contract an agent needs but the spec does not state.
  update:
    x-api-evangelist:
      provider: azure-ad
      workload: ChangeNotifications
      operations: 6
      artifacts:
        authentication: authentication/azure-ad-authentication.yml
        scopes: scopes/azure-ad-scopes.yml
        conventions: conventions/azure-ad-conventions.yml
        errors: errors/azure-ad-problem-types.yml
        rate_limits: rate-limits/azure-ad-rate-limits.yml
        lifecycle: lifecycle/azure-ad-lifecycle.yml
        data_model: data-model/azure-ad-data-model.yml
    x-error-format:
      rfc9457: false
      media_type: application/json
      envelope: '{"error":{"code","message","innerError","details"}}'
      branch_on: error.code
      docs: https://learn.microsoft.com/en-us/graph/errors
    x-rate-limits:
      status: 429
      algorithm: token bucket over ResourceUnits per application+tenant pair
      retry_after_header: false
      retry_after_note: Identity and Access resources do NOT return Retry-After on 429. Use exponential
        backoff.
      docs: https://learn.microsoft.com/en-us/graph/throttling-limits
    x-idempotency:
      coverage: none
      header: null
      concurrency_control: If-Match / ETag, 412 Precondition Failed
      note: No idempotency key exists. A retried POST can create a duplicate object.
    x-pagination:
      style: opaque cursor
      next_field: '@odata.nextLink'
      count_field: '@odata.count'
      advanced_query_header: 'ConsistencyLevel: eventual (required for $search and $count)'
    x-deprecation-policy:
      notice_period: 24 months
      sunset_header: false
      announced_at: https://developer.microsoft.com/en-us/graph/changelog
- target: $.servers.*
  description: Name the production host explicitly for readers of the split documents.
  update:
    x-environment: production
- target: $.info
  description: Point at the event catalogue this subscription surface drives.
  update:
    x-event-catalog: asyncapi/azure-ad-change-notifications-webhooks.yml