Taxi - Describe How Your APIs and Data Relate API Rules

# taxi — 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: 100% of servers already https (error)
#   - servers-expected-domain: 1/1 servers on taxilang.org
#   - path-params-casing: snake @ 100% (n=4)
#   - query-params-casing: snake @ 100% (n=4)
#   - operationid-casing: camel @ 100% (n=11)
#   - schema-names-casing: pascal @ 100% (n=18)
#   - schema-properties-casing: snake @ 100% (n=68)
#   - error-schema-defined: Error
#   - pagination params observed: ['limit']
#   - merge: kept 8 existing, added 8 measured, upgraded 0
#   - added: servers-https-only, servers-expected-domain, path-params-casing, query-params-casing, schema-names-casing, schema-properties-casing, error-schema-defined, no-empty-descriptions
extends:
  - spectral:oas
rules:
  taxi-operation-ids-camel-case:
    description: Operation IDs must use camelCase
    message: operationId '{{value}}' must use camelCase
    severity: warn
    given: $.paths[*][*].operationId
    then:
      function: pattern
      functionOptions:
        match: ^[a-z][a-zA-Z0-9]*$
  taxi-path-kebab-case:
    description: Path segments must use kebab-case
    message: 'Path segment must use kebab-case: {{path}}'
    severity: warn
    given: $.paths[*]~
    then:
      function: pattern
      functionOptions:
        match: ^(/[a-z0-9{}-]+)*$
  taxi-operation-summary-exists:
    description: All operations must have a summary
    message: Operation at '{{path}}' is missing a summary
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: summary
      function: truthy
  taxi-operation-description-exists:
    description: All operations must have a description
    message: Operation at '{{path}}' is missing a description
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: description
      function: truthy
  taxi-response-200-exists:
    description: All operations must define a 200 response
    message: Operation at '{{path}}' must define a 200/201 success response
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      function: schema
      functionOptions:
        schema:
          anyOf:
          - required:
            - '200'
          - required:
            - '201'
  taxi-tags-title-case:
    description: Tags must use Title Case
    message: Tag '{{value}}' must use Title Case
    severity: warn
    given: $.tags[*].name
    then:
      function: pattern
      functionOptions:
        match: ^[A-Z][a-zA-Z0-9 ]*$
  taxi-info-license:
    description: API must include license information (open source)
    message: Open source API must include license info
    severity: warn
    given: $.info
    then:
      field: license
      function: truthy
  taxi-schema-descriptions:
    description: Component schemas must have descriptions
    message: Schema '{{path}}' is missing a description
    severity: warn
    given: $.components.schemas[*]
    then:
      field: description
      function: truthy
  servers-https-only:
    description: Server URLs must use HTTPS.
    severity: error
    given: $.servers[*].url
    then:
      function: pattern
      functionOptions:
        match: ^https://
  servers-expected-domain:
    description: Server URLs should be on the taxilang.org domain.
    severity: warn
    given: $.servers[*].url
    then:
      function: pattern
      functionOptions:
        match: taxilang\.org
  path-params-casing:
    description: Path parameters should be snake_case (the dominant convention in this API).
    severity: warn
    given: $.paths[*].parameters[?(@.in=='path')].name
    then:
      function: casing
      functionOptions:
        type: snake
  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
  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: casing
      functionOptions:
        type: pascal
  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 (Error) should be defined for error payloads.
    severity: warn
    given: $.components.schemas
    then:
      field: Error
      function: truthy
  no-empty-descriptions:
    description: Descriptions must not be empty strings.
    severity: warn
    given: $..description
    then:
      function: truthy