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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - The web UI holds live websocket connections for run events, coordinates cross-tab polling through a leader-election store, and renders app chrome (sidebar, providers) around a routed outlet > - When the backend is still cold-starting (managed hosting wake, server restart, reverse proxy up before the app), the event websockets refuse connections and the first SPA load mounts against a dead backend > - In that state the mount cascade can exceed React's nested update limit (minified error #185); the crash originates in shell hooks outside the routed error boundary, so React unmounts the entire root to a blank page, and the dead page keeps retrying the websocket on a flat 1.5s timer until the user hard-refreshes > - This pull request removes the wasted nested commits from the shared-polling subscription path, adds exponential backoff to the transcript websocket reconnect, and adds a last-resort app-shell error boundary > - The benefit is that a cold or briefly unreachable backend degrades to a recoverable state instead of a blank page that hammers the server ## Linked Issues or Issue Description No existing issue. Description follows the bug template: **What happened?** On the first load against a backend that was still starting, the app showed its loading animation and then a blank page. The console showed repeated `WebSocket connection to 'wss://…/api/companies/<id>/events/ws' failed` lines and `Uncaught Error: Minified React error #185` with a stack through the shared-polling coordinator's `subscribe`. The websocket retries continued indefinitely on the dead page. A manual refresh fixed it. **Expected behavior** A backend that is briefly unreachable degrades gracefully: websocket reconnects back off, the UI keeps rendering from cache, and even a worst-case crash shows a reload prompt instead of a blank page. **Steps to reproduce** 1. Serve the UI while the backend API is still starting (websocket upgrades and API calls refused). 2. Load any company page with several shared-polling consumers mounted (dashboard with sidebar). 3. Observe repeated websocket failures; on affected loads the page goes blank with React error #185. ## What Changed - `ui/src/hooks/useSharedPolling.ts`: coordinator snapshot notifications now keep the previous state object when leadership did not change, so React bails out instead of scheduling a nested re-render. `subscribe` invokes its listener synchronously from inside the mount effect with a fresh object each time; before this change every mount and notify burned nested-update budget even with no value change — the crash frame in the field report was exactly this `subscribe → setState` call. - `ui/src/components/transcript/useLiveRunTranscripts.ts`: the live event websocket reconnect backs off exponentially (1.5s → 15s cap, reset on successful open), mirroring `LiveUpdatesProvider`, instead of a flat 1.5s retry. - `ui/src/components/AppErrorBoundary.tsx` (+ wiring in `ui/src/main.tsx`): a dependency-free boundary above the router and providers. `RouteErrorBoundary` only guards the routed `<Outlet />`; a crash in the shell around it had no boundary, so React unmounted the root to a blank page. The boundary renders a reload prompt with the error message. - Tests: `useSharedPollingSnapshot.test.tsx` (mount costs no extra commit — fails against the previous code; a real leadership change re-renders exactly once and ticks stay quiet), a backoff test in `useLiveRunTranscripts.test.tsx` (delays grow 1.5s → 3s → 6s and reset after a successful open), and `AppErrorBoundary.test.tsx` (render throw, effect throw, healthy pass-through). ## Verification - `pnpm vitest run` in `ui/` over the touched suites (shared polling, cross-tab poll, transcripts, boundary): 34 tests pass. - `pnpm typecheck` in `ui/` — clean. - The snapshot regression test was verified to fail against the pre-change hook (extra commit per mount). - Not reproduced end-to-end: the exact 50-update cascade from the field crash needs a live cold backend; the change removes the identified per-mount/per-notify nested commits at the reported crash frame, bounds the reconnect load, and guarantees the shell can no longer blank the page. ## Risks Low risk. The snapshot change only suppresses re-renders whose state is value-identical; leadership changes propagate exactly as before. The backoff only lengthens retry delays after consecutive failures and resets on success. The new boundary renders children untouched unless an error reaches it; behavior on healthy loads is unchanged. Self-hosted deployments see the same code paths — the cold-backend window simply rarely occurs there. ## Model Used - Claude (Anthropic), Claude Fable 5 (`claude-fable-5`), via Claude Code CLI with extended thinking and tool use (code search, edit, test execution; diagnosis included mapping the production minified stack to source). ## 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 either (a) linked existing issues with `Fixes: #` / `Closes #` / `Refs #` OR (b) described the issue in-PR following the relevant issue template - [x] I have not referenced internal/instance-local Paperclip issues or links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip` URLs) - [x] My branch name describes the change (e.g. `docs/...`, `fix/...`) 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 - [ ] All Paperclip CI gates are green - [ ] 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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README.md
@paperclipai/ui
Published static assets for the Paperclip board UI.
What gets published
The npm package contains the production build under dist/. It does not ship the UI source tree or workspace-only dependencies.
Storybook
Storybook config, stories, and fixtures live under ui/storybook/.
pnpm --filter @paperclipai/ui storybook
pnpm --filter @paperclipai/ui build-storybook
Typical use
Install the package, then serve or copy the built files from node_modules/@paperclipai/ui/dist.