generated: '2026-07-19'
method: searched
source: live probes of /.well-known/* across Grammarly hosts
hosts:
- host: https://www.grammarly.com
  documents:
  - path: /.well-known/security.txt
    status: 200
    file: grammarly-security.txt
  - path: /.well-known/openid-configuration
    status: 404
  - path: /.well-known/oauth-authorization-server
    status: 404
  - path: /.well-known/api-catalog
    status: 404
  - path: /.well-known/ai-plugin.json
    status: 404
- host: https://developer.grammarly.com
  documents:
  - path: /.well-known/security.txt
    status: 404
  - path: /.well-known/openid-configuration
    status: 404
- host: https://api.grammarly.com
  documents:
  - path: /.well-known/security.txt
    status: 403
  - path: /.well-known/oauth-authorization-server
    status: 404
- host: https://auth.grammarly.com
  documents:
  - path: /.well-known/oauth-authorization-server
    status: 404
  - path: /.well-known/openid-configuration
    status: 403
notes: >-
  Only www.grammarly.com publishes a /.well-known/security.txt (RFC 9116). The
  API and auth hosts return 403/404 for well-known discovery documents; no
  OIDC/OAuth authorization-server metadata or api-catalog is published.