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Adds an optional Cloud-only HTML snippet so operators can load Plain’s standard chat bubble. **6 files, 16 implementation lines added; 102 additions including tests and docs.** ## Thinking Path > - Paperclip serves Cloud and self-hosted users. > - Closed beta users need a way to report problems. > - Plain provides a ready-made chat widget. > - Cloud operators can load it through a generic deployment setting. > - Self-hosted instances ignore that setting. ## Linked Issues or Issue Description **Subsystem affected** Server-served UI HTML. **Problem or motivation** Enable a chat bubble in Cloud without adding a support feature to the React app. **Proposed solution** Insert trusted `PAPERCLIP_CLOUD_UI_SNIPPET` HTML before `</body>` when the existing Cloud-managed predicate is true. The setting is off by default. Related Cloud-gated integration: #12190. ## What Changed Review the [final diff](https://github.com/paperclipai/paperclip/pull/13168/files) in this order: 1. `server/src/cloud-ui-snippet.ts`: the eight-line Cloud gate and HTML insertion. 2. `server/src/static-index-html.ts` and `server/src/app.ts`: apply it to static root/index, SPA routes, and Vite HTML. 3. Two test files and `doc/cloud-ui-snippet.md`: boundary checks and setup instructions. React UI, customer identity, and database behavior are unchanged. The existing feedback flag remains. Plain chat is anonymous; no Paperclip name, email, or organization is supplied. ## Verification - **Greptile: 5/5**, no actionable findings, reviewed commit `04bb44515`. - **[CI passed](https://github.com/paperclipai/paperclip/actions/runs/34535763243)**, including build, typecheck, server tests, and end-to-end tests. - Local: six focused tests, full typecheck, and build passed. The full local suite has not produced a final result; CI is the completed full verification. - Staging deployment and live chat testing remain to be done. ### Staging setup Set **one server environment variable**, `PAPERCLIP_CLOUD_UI_SNIPPET`, to: ```html <script> (function(d) { var script = d.createElement('script'); script.src = 'https://chat.cdn-plain.com/index.js'; script.onload = function() { Plain.init({ appId: 'liveChatApp_01M26J213F6RR53YRARZVAFCZZ' }); }; d.head.appendChild(script); })(document); </script> ``` This is the public staging app ID. **No API key or signing secret is needed.** Deploy to staging and restart the app with this setting. Test `/`, `/index.html`, and an organization dashboard; send a message and confirm a support reply returns. Production rollout is separate. [Plain embed docs](https://www.plain.com/docs/product/channels/chat) · [Configuration and rollback](https://github.com/paperclipai/paperclip/blob/04bb4451510b124f21b6771b7a8163faad61d8ec/doc/cloud-ui-snippet.md) ## Risks Only trusted operators should set this value. The HTML is public and scripts execute in the app origin; do not include secrets or user-provided HTML. Plain owns the anonymous browser session, with no Paperclip account-switch integration. To roll back, unset the variable, restart, and refresh open tabs. ## Model Used OpenAI Codex (GPT-6), with repository inspection and code execution. Exact runtime model identifier and context size are not exposed in this session. ## 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 and contains no internal Paperclip ticket id or instance-derived details - [ ] 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> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>