FOLIO API Rules

# authorship: generated by API Evangelist tooling (derive-rules.py, 2026-10-09). x-method: generated
# Every rule below was MEASURED against FOLIO's own contract before it was written; a rule is present only
# when the contract satisfies it at 80% or more. Severity: 100% -> error, >= 90% -> warn, else info.
# Provenance:
#   - operation-has-operationid: 99%
#   - operationid-casing-camel: 97%
#   - operation-has-success-response: 100%
#   - operation-declares-4xx: 89%
#   - path-no-trailing-slash: 100%
#   - path-params-in-braces: 100%
#   - write-declares-request-body: 85%
#   - property-name-casing-camel: 100%
x-method: generated
x-generator: derive-rules.py
x-generated: '2026-10-09'
x-source:
- openapi/folio-edge-caiasoft-openapi.yml
- openapi/folio-edge-courses-openapi.yml
- openapi/folio-edge-dcb-openapi.yml
- openapi/folio-edge-dematic-openapi.yml
- openapi/folio-edge-erm-openapi.yml
extends:
- - spectral:oas
  - recommended
formats:
- oas3
rules:
  operation-has-operationid:
    description: 'Every operation declares an operationId (measured: 99% of this contract)'
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: operationId
      function: truthy
  operationid-casing-camel:
    description: 'operationIds are camelCase (measured: 97% of this contract)'
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].operationId
    then:
      function: casing
      functionOptions:
        type: camel
  operation-has-success-response:
    description: 'Every operation declares a 2xx response (measured: 100% of this contract)'
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      function: schema
      functionOptions:
        schema:
          type: object
          patternProperties:
            ^2\d\d$: {}
          minProperties: 1
  operation-declares-4xx:
    description: 'Every operation declares at least one 4xx response (measured: 89% of this contract)'
    severity: info
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      function: schema
      functionOptions:
        schema:
          type: object
          patternProperties:
            ^4\d\d$: {}
          minProperties: 1
  path-no-trailing-slash:
    description: 'Paths carry no trailing slash (measured: 100% of this contract)'
    severity: warn
    given: $.paths[*]~
    then:
      function: pattern
      functionOptions:
        notMatch: ./$
  path-params-in-braces:
    description: 'Path parameters use {braces}, not :colon (measured: 100% of this contract)'
    severity: error
    given: $.paths[*]~
    then:
      function: pattern
      functionOptions:
        notMatch: ':'
  write-declares-request-body:
    description: 'POST and PUT declare a request body (measured: 85% of this contract)'
    severity: info
    given: $.paths[*][post,put]
    then:
      field: requestBody
      function: truthy
  property-name-casing-camel:
    description: 'Schema property names are camel case (measured: 100% of this contract)'
    severity: warn
    given: $.components.schemas[*].properties[*]~
    then:
      function: casing
      functionOptions:
        type: camel