Google's open-source DESIGN.md gives AI agents a prompt-ready blueprint for brand-consistent design

Google open-sourced DESIGN.md from its Stitch design tool, releasing a machine-readable blueprint for AI-assisted design under Apache 2.0.

The format pairs YAML design tokens with explanatory notes, aiming to help AI systems apply brand rules consistently across tools and platforms.

Google also added CLI commands for validation, comparison, and export, while keeping the project in alpha.

The project emphasizes accessibility and interoperability, including validation against standards such as WCAG and alignment with broader token workflows like W3C DTCG and Tailwind.