API Evangelist enhancements for the Gray Swan AI (Cygnal) API

overlay: 1.0.0
info:
  title: API Evangelist enhancements for the Gray Swan AI (Cygnal) API
  version: 1.0.0
extends: ../openapi/gray-swan-cygnal-openapi.json
x-provenance:
  generated: '2026-07-19'
  method: generated
  source: openapi/gray-swan-cygnal-openapi.json + docs.grayswan.ai
  note: >-
    Non-destructive overlay capturing enrichments discovered from the Cygnal
    docs that are absent from the raw spec (API-key security scheme, policy
    selector headers, provider description). Never mutates the original spec.
actions:
  - target: $.info
    update:
      description: >-
        Cygnal is Gray Swan AI's real-time AI security proxy. It fronts LLM
        providers (OpenAI, Anthropic, Gemini formats) with input/output
        filtering and threat monitoring for jailbreaks and prompt injection,
        and manages enforcement Policies with versioning. Drop-in: change only
        the base URL. Auth via the grayswan-api-key header plus a policy-id or
        agent-id selector.
      x-authentication:
        scheme: apiKey
        header: grayswan-api-key
        docs: https://docs.grayswan.ai/cygnal/creating-completions
  - target: $.components
    update:
      securitySchemes:
        GraySwanApiKey:
          type: apiKey
          in: header
          name: grayswan-api-key
          description: First-party API key from https://platform.grayswan.ai
  - target: $.paths['/cygnal/v1/chat/completions'].post
    update:
      x-required-headers:
        - name: grayswan-api-key
          required: true
        - name: policy-id
          required: conditional
          description: Required unless agent-id is supplied; no default policy.
        - name: agent-id
          required: conditional
      x-rate-limits:
        free_tier: 200000 tokens/min, 10000000 tokens/day
        over_quota: proxied without filtering