Vercel releases public prompt to guide AI web design
Vercel has released a new public prompt file, design.md, meant to help AI agents generate web pages that match Vercel’s design style, even if those agents can’t access Vercel’s internal code. In tests with Codex running GPT-5.5, using design.md led to 57% fewer known failure modes across six sample pages. Every test page still had at least one major failure, though, so it’s progress—not perfection.
- design.md is freely available to any agent or developer
- Tested in over 200 automated runs on six sample pages
- Known errors dropped from 91 to 39 with design.md
- Each test page still failed at least once
- Vercel says encoding human judgment helps but isn't foolproof
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