What Is DESIGN.md? A Practical Guide to Design Systems for AI Agents

Short summary

DESIGN.md is an open Google Labs format that lets you describe your design system to AI coding agents in a single, version-controlled file using YAML tokens and markdown rules. It eliminates the need to re-explain your brand identity to Claude Code, Cursor, or other agents on every interaction. Once created, any UI an agent generates starts from your design system instead of generic defaults.

• •Open format pairing YAML design tokens with markdown design rationale
• •Eliminates repetitive re-explanation of design systems to AI agents
• •Works with Claude Code, Cursor, Kiro, Windsurf — no build pipeline required

Generated with AI, which can make mistakes.