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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - Managed worktrees can run a Paperclip development server for each task > - The managed runtime used the built UI when its service did not set the UI development middleware option > - This made new UI source changes require a manual build instead of a hot reload > - The runtime must supply the development default while it must keep an explicit operator choice > - This pull request enables the UI development middleware for new managed Paperclip development services > - The benefit is that UI edits appear in the managed worktree browser without a manual build ## Linked Issues or Issue Description **What happened?** A new managed Paperclip development worktree served the built UI by default. An operator had to set `PAPERCLIP_UI_DEV_MIDDLEWARE=true` before UI source changes could hot reload. **Expected behavior** New managed Paperclip development worktrees must enable the UI development middleware by default. An explicit `PAPERCLIP_UI_DEV_MIDDLEWARE=false` value must continue to disable it. **Steps to reproduce** 1. Start a managed Paperclip development service without `PAPERCLIP_UI_DEV_MIDDLEWARE`. 2. Open its UI. 3. Change a UI source file. 4. Observe that the browser does not receive the change until the UI is built again. **Paperclip version or commit** This was reproduced on `317394456` from `master`. **Deployment mode** Local development with a managed worktree runtime. ## What Changed - Set `PAPERCLIP_UI_DEV_MIDDLEWARE=true` for managed `paperclip-dev` services when the service does not set a value. - Keep explicit service values, including `false`. - Add a regression test and document the default and the opt-out. ## Verification - `pnpm --filter @paperclipai/server exec vitest run src/__tests__/workspace-runtime.test.ts -t "enables UI dev middleware by default"` - `pnpm -r typecheck` - `pnpm build` - `pnpm test:run` completed with 5,397 passing tests. Four existing runtime-port tests could not use ports `42000` and `52000` because a live managed runtime owns those ports on this host. The new regression test passed separately. ## Risks - Risk is low. The change applies only to managed services named `paperclip-dev`. - A service can keep the built UI by setting `PAPERCLIP_UI_DEV_MIDDLEWARE=false`. - There is no database or API contract change. > For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and discuss it in `#dev` before opening the PR. Feature PRs that overlap with planned core work may need to be redirected — check the roadmap first. See `CONTRIBUTING.md`. ## Model Used OpenAI Codex, `gpt-5.6-sol`, hosted Codex context window, high reasoning, tool use, code execution, and multi-file repository editing. ## 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 - [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 --------- Co-authored-by: Paperclip <noreply@paperclip.ing>