- c2-core: POST /discord/link-codes (org owner/admin) mints a single-use,
10-minute code; minting revokes the org's older codes. The bot redeems it
via POST /discord/guilds/{id}/link/redeem (service key) inside one
Firestore transaction, so two servers racing for one code cannot both win
and a server linked to org A refuses org B's code. GET/DELETE
/discord/linked-guilds lists/unlinks the caller's org's servers; unlink
stops that server's streams. Rate-limited (mint per user, redeem per
server and per Discord user); every mint/link/refusal/unlink audited.
- resolve_guild_org: an explicitly unlinked server no longer falls back to
DISCORD_UNLINKED_GUILD_ORG_ID. Linking away from the fallback org stops
the streams it had running for that org.
- Discord bot: /drb link code: (Manage Server, enforced at runtime too);
GatedTree answers every other command in an unlinked server with how to
link (autocomplete returns nothing). With the default fallback org set,
nothing is gated — unchanged behaviour.
- Frontend: "Linked Discord servers" card on Settings -> Organization —
generate code with countdown + copy, polls for the new link, unlink.
- 16 tests: single-use, two-server race, one-server/two-org race, expiry,
revoked/malformed codes, wrong-org takeover, idempotent relink, rate
limits, fallback stop, scoped list, unlink without fallback.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
