Every time I start a new project in Claude Code, I spend the first 20 minutes re-explaining my design system.

Same tokens. Same spacing logic. Same brand rules. Every single session.

Google just open-sourced DESIGN.md, the format behind their Stitch tool. It lets you export your design system rules as a structured file that any AI tool can read and apply. Brand identity, component logic, design tokens, all captured in a format that travels with your project.

The problem was never that AI generates ugly interfaces. The problem was that AI had no memory of what your brand actually is. You were rebuilding that context from scratch every session.

DESIGN.md is the persistent layer that was missing.

Grab the spec from the Stitch GitHub repo. Create a DESIGN.md file for your active project. Drop it into your next Claude Code session with "read this before generating any UI." See what happens to the output quality.