- A user's own key goes only to https://api.anthropic.com, https://api.openai.com/v1
or an origin listed in STC_AI_ALLOWED_BASE_URLS / the server config's
allowedBaseUrls; anything else is a 400, and a stored key whose origin was
later removed stops being used.
- User-scope provider calls never follow redirects, and their errors reach the
user only as the HTTP status plus a fixed message; the full text is logged.
- The admin's server-scope provider may still use any base URL.
- Admin UI: allowed origins field; MCP stdio env editable, HTTP headers kept.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
