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Vercel publishes design.md at a public URL and measured 57% fewer mechanical failures in agent-built pages
Vercel described how its coding agents produce on-brand pages by loading a design.md from vercel.com/design.md alongside a bounded stylesheet at vercel.com/geist/vercel-brand.css, so agents pick from existing CSS classes and tokens instead of inventing typography and spacing. In a controlled test generating three scenarios twice, pages built with design.md had 39 mechanical failures against 91 without, a 57% reduction. The technique that carries the load is writing observable decisions ('evidence tables use full available width') rather than vague directives, plus a list of named anti-patterns; Vercel is upfront that only six pages were tested and the checks only catch previously-documented failures.
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