## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work.
> - Connection intents need secure provider implementations to complete
setup.
> - Some providers use managed OAuth or external credential brokers.
> - Those tokens must stay out of durable Paperclip state and fail
closed when refresh fails.
> - This pull request adds managed connector backends and the required
storage contract.
> - The benefit is safer provider setup with governed credential
lifecycles.
## Linked Issues or Issue Description
Refs #11965
This is stack 8 of 11. It depends on stack 7 and replaces another
reviewable part of #11965.
## What Changed
- Add managed Google Workspace and external connector backends.
- Add Vercel Connect support without storing provider bearer tokens.
- Add replay-safe migration 0232 and its generated snapshot.
- Fail closed and clear stale token bindings when organization OAuth
refresh needs reauthorization.
## Verification
- `pnpm --filter @paperclipai/server typecheck`
- `pnpm --filter @paperclipai/server exec vitest run
src/__tests__/tool-access-service.test.ts`
- Result: 194 tests passed.
- `pnpm --filter @paperclipai/db check:migrations`
- `pnpm build`
- `pnpm exec vitest run --project @paperclipai/server
server/src/services/remote-url-credentials.test.ts` (5 passed, including
URL userinfo vault extraction)
## Risks
- Broker metadata errors can block provider setup.
- OAuth refresh failure disables the shared organization connection
until reauthorization.
- Migration 0232 is generated, ordered after 0231, and safe to replay.
> I checked `ROADMAP.md`. This stack continues the existing app
connection work from #11965 and does not duplicate another planned item.
## Model Used
OpenAI Codex, GPT-5. The runtime model ID and context window were not
exposed. The model used reasoning, tool use, and code execution.
## Checklist
- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have linked the public source pull request with `Refs #`
- [x] I have not referenced internal or instance-local Paperclip issues
or links
- [x] My branch name describes the change and contains no internal
Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] All Paperclip CI gates are green
- [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge
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