Register

Dynamic Client Registration (RFC 7591).

Claude's connector flow attempts DCR and reports a registration failure rather than falling back, so this has to exist for the "paste a URL" path to work at all.

No client record is stored. Authorization is anchored on the user's Google login and on the redirect_uri allowlist, neither of which a client_id would strengthen: the codes are single-use, short-lived and PKCE-bound. Issuing an identifier without persisting one keeps that honest rather than implying a registry we don't consult.