What problem does it solve? Teams struggle to keep visual identity consistent across projects and coding agents. This Skill creates and validates DESIGN.md files — Google's open spec that combines machine-readable design tokens with human-readable rationale — so colors, typography, and components stay single-sourced and accessible. ## Core Features & Use Cases - Authoring: Generate a complete DESIGN.md with YAML token frontmatter (colors, typography, rounded, spacing, components) and canonical Markdown sections in the enforced order. - Linting & Accessibility: Run npx @google/design.md lint to catch broken token references, duplicate sections, invalid values, and WCAG AA/AAA contrast failures. - Export & Diff: Convert tokens to Tailwind theme JSON or W3C DTCG JSON, and diff two versions to detect regressions. - Use Case: A user pastes their brand palette and asks for a design system; the Skill writes DESIGN.md, lints it for contrast issues, and exports tailwind.theme.json for their existing project. ## Quick Start Create a DESIGN.md design token spec for my brand with a blue accent color, then lint it and export a Tailwind theme.