DESIGN.md Skill

DESIGN.md is Google's open spec (Apache-2.0, google-labs-code/design.md) 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 (npx @google/design.md) 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 wants consistent UI/brand across multiple projects or tools
• User pastes an existing DESIGN.md and asks to lint, diff, export, or extend it
• User asks to port a style guide into a format agents can consume
• User wants contrast / WCAG accessibility validation on their color palette