Give an agent a brand's DESIGN.md and compare how color, typography, and spacing rules change the actual UI output. It is a practical way to test design-system promptability.

A Chrome extension that extracts webpage styles into DESIGN.md.
A community library for finding and downloading design-system files AI can read.
A reference for Vercel's design tokens and UI rules.
A design reference library that pairs UI screenshots with MD files.
Figma context for agent tools