# Free ship-safe rules for Cursor: Pretty much stops the 5 mistakes AI-written web apps keep shipping **URL:** \ **Category:** Built for Cursor\ **Tags:** web-dev, rules\ **Created:** [October 25, 2026, 11:02pm UTC](https://forum.cursor.com/t/free-ship-safe-rules-for-cursor-pretty-much-stops-the-5-mistakes-ai-written-web-apps-keep-shipping/176139 "2026-10-25T23:02:56Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![X-WallStreet-Trucker](https://avatars.discourse-cdn.com/v4/letter/x/8491ac/32.png) [@X-WallStreet-Trucker](https://forum.cursor.com/u/X-WallStreet-Trucker)\ **Post date:** [October 25, 2026, 11:02pm UTC](https://forum.cursor.com/t/free-ship-safe-rules-for-cursor-pretty-much-stops-the-5-mistakes-ai-written-web-apps-keep-shipping/176139/1 "2026-10-25T23:02:56Z")
Disclosure: I run AgentCartridge, which sells paid rules packs. This rules file is free and needs no signup. The page also has a link to one of our paid packs further down. Whenever I let the agent write web app code, it kept making/repeating the same five mistakes, so I wrote a rules file that addresses those mistakes: 1. Secrets in client code or the repo (for example a key behind a NEXT\_PUBLIC\_ or VITE\_ variable, or a committed .env) 2. Missing security headers (CSP, HSTS, nosniff, Referrer-Policy) 3. Weak HTTPS assumptions (http:// URLs, cookies without Secure/HttpOnly/SameSite) 4. Broken asset and link paths (local file paths, wrong-case file names, links to routes that no longer exist) 5. Fat client bundles (importing a whole library for one function) Setup: save it as .cursor/rules/ship-safe.mdc with alwaysApply: true. The same body also works pasted into CLAUDE.md or AGENTS.md. Then ask the agent to review your current code against it once. The full file is on the page, so you can copy it directly: [Ship-Safe Rules for Cursor & Claude Code: Stop 5 Common Vibe-Coding Fails | AgentCartridge](https://agentcartridge.com/rules/ship-safe) If one of the rules is wrong for your stack or too strict, let me know and I’ll fix it. ---
**Author:** ![discourse\_ai\_spam](https://avatars.discourse-cdn.com/v4/letter/d/c68b51/32.png) [@discourse\_ai\_spam](https://forum.cursor.com/u/discourse_ai_spam)\ **Post date:** [October 25, 2026, 11:02pm UTC](https://forum.cursor.com/t/free-ship-safe-rules-for-cursor-pretty-much-stops-the-5-mistakes-ai-written-web-apps-keep-shipping/176139/2 "2026-10-25T23:02:58Z")
Unlisted on October 25, 2026, 11:02pm UTC ---
**Author:** ![system](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/system/32/99069_2.png) [@system](https://forum.cursor.com/u/system)\ **Post date:** [October 26, 2026, 4:07am UTC](https://forum.cursor.com/t/free-ship-safe-rules-for-cursor-pretty-much-stops-the-5-mistakes-ai-written-web-apps-keep-shipping/176139/5 "2026-10-26T04:07:28Z")
Listed on October 26, 2026, 4:07am UTC