## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - In task chat, a person can edit a queued message before the agent receives it > - The server rejects an edit with 409 when the queue changed in another session > - The composer kept the text, but it showed no reason, so the edit looked stuck > - This pull request shows the reason under the editor > - The benefit is that the person knows the edit was not saved and what to do next ## Linked Issues or Issue Description **What happened** Two sessions edited the same queued message. The older save got `409 queued_comment_revision_conflict`. The composer still said "Editing queued message" and showed no error. **Expected behavior** The composer tells the person that the queue changed in another session, keeps the text, and lets them save again. **Steps to reproduce** 1. Queue a message on a task with a running agent. 2. Open the task in two tabs and start editing the queued message in both. 3. Save in the second tab, then save in the first tab. 4. See no error in the first tab. ## What Changed - `TaskChatComposer` shows a save failure for a queued message edit in its existing `role="alert"` line (`data-testid="task-chat-queued-edit-error"`). The error clears when the edit ends or a new save starts. - `api/errors.ts` has copy for `queued_comment_revision_conflict`, `queued_comment_stale_queue`, `queued_comment_stale_target` and `queued_comment_not_pending`. - The existing queue refresh after a 409 updates the revision, so a second save works. ## Verification - Red then green: `cd ui && npx vitest run src/components/task-chat/TaskChatComposer.test.tsx` (new test `shows why a concurrent queue change rejected the save and keeps the edit` fails on `master`; all 146 pass with the change). - `npx vitest run src/components/TaskChatThread.test.tsx src/api/errors.test.ts` (479 passed). - `pnpm check:token-gates`: all gates clean. - `tsc --noEmit -p ui`: no errors outside unrelated Storybook files. ## Risks - Low risk. UI copy only, no new API. A stale edit now shows a short error line in addition to the "Queued message changed" label. ## Model Used - Anthropic Claude Opus 5.5 (`claude-opus-5-5`), tool use and code execution in Claude Code. ## 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 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
@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.
Editor dependency identity
Keep the root and workspace overrides for @codemirror/state,
@codemirror/view, and @lezer/common aligned. CodeMirror requires shared
extension identity, while Lezer parsers and syntax highlighters require shared
NodeProp IDs. Multiple Lezer copies can crash code-block highlighting with
tags is not iterable. src/lib/codemirror-single-instance.test.ts checks the
installed dependency graph and highlights sample code through the editor's real
language dependencies. GitHub Actions owns regeneration of pnpm-lock.yaml.