API Evangelist enhancements for the Neutrino API

overlay: 1.0.0
info:
  title: API Evangelist enhancements for the Neutrino API
  version: 1.0.0
extends: openapi/neutrino-api-openapi-3.1.json
x-generated: '2026-08-09'
x-method: generated
x-source: openapi/neutrino-api-openapi-3.1.json
x-description: >-
  Non-destructive enhancements to Neutrino API's published OpenAPI 3.1
  definition. The original is never mutated. Everything asserted here is either
  a pointer to an artifact in this repo or a fact taken verbatim from the
  provider's own documentation — the overlay adds no operations, parameters or
  schemas that Neutrino API does not publish.
actions:
  - target: $.info
    update:
      x-apievangelist:
        catalog: https://apis.io/neutrino-api
        provider: Neutrino API
        maintainer: Kin Lane <kin@apievangelist.com>
        source: https://www.neutrinoapi.com/api/openapi-3.1.json
        discovery: https://www.neutrinoapi.com/.well-known/api-catalog
        artifacts:
          - apis.yml
          - authentication/neutrino-api-authentication.yml
          - changelog/neutrino-api-changelog.yml
          - conformance/neutrino-api-conformance.yml
          - conventions/neutrino-api-conventions.yml
          - data-model/neutrino-api-data-model.yml
          - errors/neutrino-api-problem-types.yml
          - lifecycle/neutrino-api-lifecycle.yml
          - llms/neutrino-api-llms.txt
          - mcp/neutrino-api-mcp.yml
          - packages/neutrino-api-packages.yml
          - security/neutrino-api-domain-security.yml
          - skills/_index.yml
          - well-known/neutrino-api-well-known.yml
  - target: $.info
    update:
      x-conventions:
        output_format_param: output-format
        output_case_param: output-case
        output_case_default: kebab
        note: >-
          Response FIELD NAMES change with the request's output-case option. The
          schemas in this document describe the kebab-case default. Pin
          output-case explicitly in generated clients.
        detail: conventions/neutrino-api-conventions.yml
  - target: $.info
    update:
      x-error-catalog:
        format: neutrino-api-error
        rfc9457: false
        envelope: '{ "api-error": integer, "api-error-msg": string }'
        note: >-
          HTTP status is coarse (400 for nearly every failure, 403 for auth, 500
          for faults). The numeric api-error code is the field to branch on.
          An unrouted path returns 400 with api-error 45, not a 404.
        codes: errors/neutrino-api-problem-types.yml
        docs: https://www.neutrinoapi.com/api/api-errors/
  - target: $.info
    update:
      x-rate-limits:
        model: per-endpoint daily quota by plan
        reset: rolling 24 hours from the first request of the day
        response_headers: false
        signalled_by: [api-error 2, api-error 16, api-error 31]
        docs: https://www.neutrinoapi.com/plans/
  - target: $.info
    update:
      x-lifecycle:
        versioning: none — the API is unversioned on the wire
        sunset_header: false
        deprecated_endpoints_absent_from_spec:
          - /user-agent-info
          - /html5-render
          - /sms-message
          - /html-extract-tags
          - /code-highlight
        note: >-
          Every operation in this document is deprecated:false because the five
          legacy endpoints are excluded from the specification entirely. Their
          only deprecation signal is an HTML banner in the docs and api-error 18
          on the wire.
        detail: lifecycle/neutrino-api-lifecycle.yml
  - target: $.info
    update:
      x-undocumented-in-spec:
        - path: /multi
          method: POST
          name: Batch Processing
          docs: https://www.neutrinoapi.com/api/batch-processing/
          note: >-
            Documented and live, but absent from this specification, so no
            generated client supports it. Accepts a JSON body with a `data`
            array of up to 2500 request objects, each carrying an `endpoint`
            field. Fourteen endpoints are batch-enabled. Recorded here as a
            known spec/documentation divergence — NOT modelled, because API
            Evangelist does not author operations on a provider's behalf.
  - target: $.servers
    update:
      x-endpoint-selection:
        note: >-
          The seven servers are not environments or regions in the usual sense —
          they are the deployment and compliance control surface. eu./aus./usa.
          are geofences that guarantee in-boundary processing; aws./gcp. pin a
          single cloud; neutrinoapi.com is a backup on a separate TLD.
        docs: https://www.neutrinoapi.com/api/multicloud/
  - target: $.components.securitySchemes
    update:
      x-authentication:
        combined_header: 'API-Key: <user-id>:<api-key>'
        also_accepted_as: [query parameter, POST body field]
        oauth: false
        key_restriction: >-
          Keys can be restricted to specific endpoints in the account dashboard;
          there is no machine-readable scope vocabulary.
        docs: https://www.neutrinoapi.com/api/api-basics/
        detail: authentication/neutrino-api-authentication.yml
  - target: $.components.schemas.APIError
    update:
      x-catalog: errors/neutrino-api-problem-types.yml
      x-note: >-
        Referenced by the 400, 403, 500 and default response of all 28
        operations. api-error is the discriminating value.