## Thinking Path
> - Paperclip is the open source app people use to manage AI agents for
work.
> - Agent authentication uses server sessions, plugin workers, and
browser login panels.
> - A page reload loses an active login session, and one worker permits
only one login terminal.
> - These limits cause lost work and prevent two owners from logging in
through one worker.
> - This pull request lets the browser resume active sessions and lets
workers serve concurrent login terminals.
> - The benefit is reliable login recovery with a bounded process-wide
route limit.
## Linked Issues or Issue Description
**What existing behavior does this improve?**
It improves agent credential login recovery and concurrent login
terminal handling.
**Subsystem affected**
Cross-cutting (multiple of the above).
**Current behavior**
A page reload loses the active login session. A shared plugin worker
rejects a second login terminal.
**Proposed behavior**
The browser reads and resumes the owner's active session. A worker
supports multiple login terminal routes under a process-wide ceiling.
**Reason and benefit**
Owners keep login progress after a reload. Two owners can log in through
one worker without removing the route limit.
**Breaking changes**
None. The change adds owner-scoped read routes and changes login
terminal concurrency.
## What Changed
- Replace the single worker login route with maps keyed by host route
and worker session identifiers.
- Add a process-wide login route ceiling and release each reserved slot
on every exit path.
- Add owner-scoped active-session reads with consistent negative
responses and private cache control.
- Keep the device-login prompt while the session has an active public
status.
- Add a durable setup-token cancel fallback for a lost in-memory
session.
- Resume active sessions when the agent configuration or onboarding
panel mounts.
- Remove routine unmount cancellation and keep explicit Cancel behavior.
## Verification
- `pnpm --filter @paperclip/server test` — server route, service, and
plugin-worker-manager suites.
- `pnpm --filter @paperclip/plugin-sdk test` — worker RPC host suite.
- `cd ui && npx vitest run
src/components/AgentConfigForm.render.test.tsx
src/components/OnboardingWizard.test.tsx`.
- `cd ui && npx tsc -b`.
- `tests/e2e/onboarding.spec.ts` — reload during login.
- CI must pass on this pull request.
## Risks
The change affects agent authentication and the sandbox-to-host
boundary. Route cleanup must release every reserved slot. Owner checks
must prevent cross-owner session access. Tests cover route cleanup,
owner scope, reload recovery, and concurrent worker routes.
## Model Used
Codex, OpenAI GPT-5, tool use and code review support. The
implementation author owns the exact model details for the code changes.
## 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 described the issue in-PR with the relevant issue-template
fields
- [x] I have not referenced internal/instance-local Paperclip issues or
links
- [x] My branch name describes the change and contains no internal
Paperclip ticket id
- [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 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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Co-authored-by: Paperclip <noreply@paperclip.ing>
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