This one hooks into Vercel's living web interface guidelines and runs them against your code. Instead of manually checking accessibility, responsive design, or UX patterns, you just point it at your files and it fetches the latest rules from GitHub, then outputs violations in a clean file:line format. It's meant for those "review my UI" or "check this against best practices" moments. The smart bit is that it pulls fresh guidelines every time, so you're not auditing against stale rules. Useful if you're shipping web interfaces and want a second pair of eyes that knows what Vercel considers good practice, especially around the details that are easy to miss in a PR.
npx skills add https://github.com/bytedance/deer-flow --skill web-design-guidelines