DESIGN.md Skill DESIGN.md is Google's open spec (Apache-2.0, ) for describing a visual identity to coding agents. One file combines: - YAML front matter — machine-readable design tokens (normative values) - Markdown body — human-readable rationale, organized into canonical sections Tokens give exact values. Prose tells agents why those values exist and how to apply them. The CLI ( ) lints structure + WCAG contrast, diffs versions for regressions, and exports to Tailwind or W3C DTCG JSON. When to use this skill - User asks for a DESIGN.md file, design tokens, or a design system spec - User wan…