API Evangelist enhancements for LALAL.AI Batch Stem Separation Voice Change API

overlay: 1.0.0
info:
  title: API Evangelist enhancements for LALAL.AI Batch Stem Separation Voice Change API
  version: 1.0.0
extends: openapi/lalal-ai-voice-change-api-openapi.yml
x-generated: '2026-08-13'
x-method: generated
x-source: Derived from the repo artifacts and live probes of https://www.lalal.ai on 2026-08-13. Does not mutate
  the harvested spec.
actions:
- target: $.info
  description: Stamp API Evangelist provenance and link the derived artifacts back to the contract.
  update:
    x-apievangelist-provider: lalal-ai
    x-apievangelist-source: https://www.lalal.ai/api/v1/openapi.json
    x-apievangelist-harvested: '2026-05-25'
    x-apievangelist-reviewed: '2026-08-13'
    x-apievangelist-artifacts:
      authentication: authentication/lalal-ai-authentication.yml
      conventions: conventions/lalal-ai-conventions.yml
      errors: errors/lalal-ai-problem-types.yml
      lifecycle: lifecycle/lalal-ai-lifecycle.yml
      data_model: data-model/lalal-ai-data-model.yml
      rate_limits: rate-limits/lalal-ai-rate-limits.yml
      plans: plans/lalal-ai-plans-pricing.yml
      skills: skills/_index.yml
- target: $.info
  description: Record the runtime semantics observed by probe that the published contract does not state.
  update:
    x-request-id-header: x-request-id
    x-error-envelope:
      fields:
      - detail
      - code
      rfc9457: false
    x-missing-credential-status: 403
    x-async-model: submit-then-poll via POST /api/v1/check/; no webhooks or callbacks
    x-failed-task-http-status: 200
- target: $.components.securitySchemes.ApiKeyHeaderAuth
  description: Document the credential model the spec declares but does not describe.
  update:
    description: 'Account license key. Long-lived, unscoped, not rotatable through the API. A missing or invalid
      key returns HTTP 403 with {"detail": "Provide license key in ''X-License-Key'' header"} and no WWW-Authenticate
      challenge.'
    x-credential-scope: account
    x-test-credential: false
- target: $.paths.*.post
  description: Flag that mutating operations accept a caller-supplied uuid4 idempotency_key in the request body
    (not an Idempotency-Key header), and that reuse after the task starts returns idempotency_key_used.
  update:
    x-idempotency:
      supported: true
      field: idempotency_key
      location: body
      format: uuid4
      scope: until the task starts processing
      on_reuse_code: idempotency_key_used