Datadog API Rules

# datadog — Spectral ruleset (strengthened)
# Plain Spectral. Existing hand-authored rules preserved; measured rules added
# from this provider's own OpenAPI conventions by strengthen_ruleset.py,
# then self-validated against the spec.
#
# Provenance:
#   - servers-https-only: 88% of servers already https (warn)
#   - path-params-casing: snake @ 100% (n=349)
#   - operationid-casing: pascal @ 94% (n=558)
#   - schema-names-casing: pascal @ 100% (n=2789)
#   - schema-properties-casing: snake @ 94% (n=5938)
#   - security: global (root) — NOT emitting operation-security-required
#   - error-schema-defined: APIErrorResponse
#   - operation-documents-403: 92% adherence
#   - operation-documents-429: 94% adherence
#   - pagination params observed: ['count', 'limit', 'page', 'page_size', 'size']
#   - merge: kept 19 existing, added 6 measured, upgraded 0
#   - added: operationid-casing, schema-names-casing, schema-properties-casing, error-schema-defined, operation-documents-403, operation-documents-429
extends:
  - spectral:oas
rules:
  info-title-required:
    severity: error
    given: $.info
    then:
      field: title
      function: truthy
  info-title-format:
    severity: warn
    given: $.info.title
    then:
      function: pattern
      functionOptions:
        match: '^Datadog '
  info-description-required:
    severity: error
    given: $.info
    then:
      field: description
      function: truthy
  info-version-required:
    severity: error
    given: $.info
    then:
      field: version
      function: truthy
  servers-defined:
    severity: error
    given: $
    then:
      field: servers
      function: truthy
  servers-https-only:
    severity: error
    given: $.servers[*].url
    then:
      function: pattern
      functionOptions:
        match: ^https://
  paths-no-trailing-slash:
    severity: error
    given: $.paths
    then:
      field: '@key'
      function: pattern
      functionOptions:
        notMatch: \/$
  paths-version-prefix:
    severity: info
    given: $.paths
    then:
      field: '@key'
      function: pattern
      functionOptions:
        match: ^\/api\/v[0-9]|^\/v[0-9]
  operation-description-required:
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: description
      function: truthy
  operation-operationid-required:
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: operationId
      function: truthy
  operation-operationid-unique:
    severity: error
    given: $
    then:
      function: oasOpId
  operation-tags-required:
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: tags
      function: truthy
  tags-title-case:
    severity: info
    given: $.tags[*].name
    then:
      function: pattern
      functionOptions:
        match: ^[A-Z][a-zA-Z0-9]*(\s[A-Za-z0-9]+)*$
  parameter-description-required:
    severity: error
    given: $.paths[*][get,post,put,patch,delete].parameters[*]
    then:
      field: description
      function: truthy
  response-success-required:
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      function: schema
      functionOptions:
        schema:
          anyOf:
          - required:
            - '200'
          - required:
            - '201'
          - required:
            - '204'
  response-description-required:
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses[*]
    then:
      field: description
      function: truthy
  security-schemes-defined:
    severity: warn
    given: $.components
    then:
      field: securitySchemes
      function: truthy
  get-no-request-body:
    severity: error
    given: $.paths[*].get
    then:
      field: requestBody
      function: falsy
  no-empty-descriptions:
    severity: error
    given: $..description
    then:
      function: truthy
  operationid-casing:
    description: Operation IDs should be PascalCase (the dominant convention in this API).
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].operationId
    then:
      function: pattern
      functionOptions:
        match: ^[A-Z][A-Za-z0-9]*$
  schema-names-casing:
    description: Component schema names should be PascalCase (the dominant convention in this API).
    severity: warn
    given: $.components.schemas
    then:
      field: '@key'
      function: pattern
      functionOptions:
        match: ^[A-Z][A-Za-z0-9]*$
  schema-properties-casing:
    description: Schema properties should be snake_case (the dominant convention in this API).
    severity: warn
    given: $.components.schemas[*].properties
    then:
      field: '@key'
      function: casing
      functionOptions:
        type: snake
  error-schema-defined:
    description: A shared error schema (APIErrorResponse) should be defined for error payloads.
    severity: warn
    given: $.components.schemas
    then:
      field: APIErrorResponse
      function: truthy
  operation-documents-403:
    description: Operations should document a 403 response (documented on 92% of this API's operations).
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      field: '403'
      function: truthy
  operation-documents-429:
    description: Operations should document a 429 response (documented on 94% of this API's operations).
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      field: '429'
      function: truthy