API Evangelist enhancements for D&B Direct+ Authentication Data File API

# OpenAPI Overlay 1.0.0 - API Evangelist enhancements. Never mutate the original spec.
overlay: 1.0.0
info:
  title: API Evangelist enhancements for D&B Direct+ Authentication Data File API
  version: 1.0.0
extends: openapi/dun-and-bradstreet-data-file-api-openapi.yml
x-generated: '2026-08-13'
x-method: generated
x-source: openapi/dun-and-bradstreet-data-file-api-openapi.yml
actions:
- target: $.info
  description: API Evangelist provenance and artifact cross-links for this Direct+ surface.
  update:
    x-apievangelist-provider: dun-and-bradstreet
    x-apievangelist-source: openapi/_original/dnb-direct-plus-openapi-original.yml
    x-apievangelist-artifacts:
      authentication: authentication/dun-and-bradstreet-authentication.yml
      conventions: conventions/dun-and-bradstreet-conventions.yml
      errors: errors/dun-and-bradstreet-problem-types.yml
      data-model: data-model/dun-and-bradstreet-data-model.yml
      lifecycle: lifecycle/dun-and-bradstreet-lifecycle.yml
      rate-limits: rate-limits/dun-and-bradstreet-rate-limits.yml
      mcp: mcp/dun-and-bradstreet-mcp.yml
- target: $.info
  description: 'Record the observed error envelope: Direct+ does not use RFC 9457 problem+json.'
  update:
    x-error-envelope:
      format: proprietary
      shape: '{transactionDetail,error:{errorCode,errorMessage,errorDetails[]}}'
      catalog: errors/dun-and-bradstreet-problem-types.yml
      rfc9457: false
- target: $.info
  description: Record that Direct+ publishes no idempotency contract, so agent retries are not replay-safe.
  update:
    x-idempotency:
      supported: false
      header: null
      source: conventions/dun-and-bradstreet-conventions.yml
- target: $.servers[0]
  description: Confirm the production host against a live probe rather than the docs.
  update:
    x-verified:
      probed: '2026-08-13'
      http_status_on_unauthenticated_call: 401
      note: plus.dnb.com answers 401 on real routes and 404 on unknown routes.
- target: $.paths['/v1/file'].post
  description: Bind submitBatchFile to the derived artifacts that describe its runtime semantics.
  update:
    x-agentic-access: agentic-access/dun-and-bradstreet-agentic-access.yml
    x-errors: errors/dun-and-bradstreet-problem-types.yml
- target: $.paths['/v1/file/{fileId}/status'].get
  description: Bind getBatchFileStatus to the derived artifacts that describe its runtime semantics.
  update:
    x-agentic-access: agentic-access/dun-and-bradstreet-agentic-access.yml
    x-errors: errors/dun-and-bradstreet-problem-types.yml
- target: $.paths['/v1/file/{fileId}/download'].get
  description: Bind downloadBatchFileResults to the derived artifacts that describe its runtime semantics.
  update:
    x-agentic-access: agentic-access/dun-and-bradstreet-agentic-access.yml
    x-errors: errors/dun-and-bradstreet-problem-types.yml