OidcDeskCredential authenticates a bearer through the validation scheme only
(never the default scheme; the cookie authenticates nothing on /api/desk and a
bearer authenticates no cookie page) and returns sub, audience and scopes. The
desk keeps judging audience, scope and per-request Active membership.
The issuer registers desk.read/desk.answer and stamps audience bifrost-desk on
tokens that carry one; client permissions are what limit scopes, so the MAS
client can neither ask for them nor use its chat token on the desk. A Desk
section without Bifrost:Oidc now fails startup in StartupConfigurationValidator.
Packages: OpenIddict.Validation.AspNetCore and .ServerIntegration 7.7.1.
No production Ratatoskr client is seeded.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
