Application Research API Rules

# application-research — 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: 90% of servers already https (warn)
#   - path-params-casing: camel @ 80% (n=132)
#   - query-params-casing: snake @ 67% (n=102)
#   - operationid-casing: camel @ 71% (n=103)
#   - schema-names-casing: pascal @ 100% (n=311)
#   - schema-properties-casing: snake @ 64% (n=1241)
#   - security: global (root) — NOT emitting operation-security-required
#   - error-schema-defined: Error
#   - pagination params observed: ['limit', 'offset']
#   - merge: kept 19 existing, added 7 measured, upgraded 0
#   - added: servers-https-only, query-params-casing, operationid-casing, schema-names-casing, schema-properties-casing, security-schemes-defined, error-schema-defined
extends:
  - spectral:oas
rules:
  info-title-required:
    description: API title must be present
    severity: error
    given: $.info
    then:
      field: title
      function: truthy
  info-version-required:
    description: API version must be specified
    severity: error
    given: $.info
    then:
      field: version
      function: truthy
  info-description-required:
    description: API description should be present
    severity: warn
    given: $.info
    then:
      field: description
      function: minLength
      functionOptions:
        min: 20
  info-license-required:
    description: License should be specified (research specs use Apache 2.0)
    severity: warn
    given: $.info
    then:
      field: license
      function: truthy
  openapi-version-3:
    description: OpenAPI version must be 3.0.x or 3.1.x
    severity: error
    given: $
    then:
      field: openapi
      function: pattern
      functionOptions:
        match: ^3\.
  servers-required:
    description: At least one server must be defined
    severity: error
    given: $
    then:
      field: servers
      function: truthy
  servers-description-required:
    description: Each server must have a description
    severity: warn
    given: $.servers[*]
    then:
      field: description
      function: truthy
  paths-kebab-case:
    description: Path segments must use kebab-case
    severity: warn
    given: $.paths
    then:
      field: '@key'
      function: pattern
      functionOptions:
        match: ^(/[a-z0-9{}/_-]+)+$
  paths-no-trailing-slash:
    description: Paths must not end with trailing slash
    severity: warn
    given: $.paths
    then:
      field: '@key'
      function: pattern
      functionOptions:
        notMatch: /$
  operation-summary-required:
    description: Every operation must have a summary
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: summary
      function: truthy
  operation-id-required:
    description: Every operation must have an operationId
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: operationId
      function: truthy
  operation-description-required:
    description: Every operation must have a description
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: description
      function: truthy
  operation-tags-required:
    description: Every operation must have at least one tag
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: tags
      function: truthy
  parameter-description-required:
    description: Every parameter must have a description
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].parameters[*]
    then:
      field: description
      function: truthy
  operation-success-response-required:
    description: Every operation must have a 2xx response
    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:
    description: Every response must have a description
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses[*]
    then:
      field: description
      function: truthy
  schema-title-required:
    description: Component schemas must have a title
    severity: warn
    given: $.components.schemas[*]
    then:
      field: title
      function: truthy
  http-get-no-request-body:
    description: GET operations must not have a request body
    severity: error
    given: $.paths[*].get
    then:
      field: requestBody
      function: falsy
  no-empty-descriptions:
    description: Descriptions must not be empty strings
    severity: warn
    given: $..description
    then:
      function: pattern
      functionOptions:
        match: .+
  servers-https-only:
    description: Server URLs must use HTTPS.
    severity: warn
    given: $.servers[*].url
    then:
      function: pattern
      functionOptions:
        match: ^https://
  query-params-casing:
    description: Query parameters should be snake_case (the dominant convention in this API).
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].parameters[?(@.in=='query')]
    then:
      field: name
      function: casing
      functionOptions:
        type: snake
  operationid-casing:
    description: Operation IDs should be camelCase (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: info
    given: $.components.schemas[*].properties
    then:
      field: '@key'
      function: casing
      functionOptions:
        type: snake
  security-schemes-defined:
    description: Security schemes should be defined in components.
    severity: warn
    given: $.components
    then:
      field: securitySchemes
      function: truthy
  error-schema-defined:
    description: A shared error schema (Error) should be defined for error payloads.
    severity: warn
    given: $.components.schemas
    then:
      field: Error
      function: truthy