Stitch’s DESIGN.md lets you package up your project’s design rules—colors, typography, spacing—into a single file you can export or import across projects. That means when you kick off a new UI build, Stitch already knows what each color or font is meant for, and it applies your brand’s look without copying rules by hand. It also runs checks against WCAG standards, so you catch accessibility issues before they reach users. Google just open-sourced the draft specification for DESIGN.md. Now any design tool or platform can read those rules directly, rather than relying on AI to guess intent. You get a shared visual language: agents know that your #0057FF is always a primary button, not just “blue,” and they can enforce contrast ratios automatically. To see it at work, Google Labs lead David East walks through a demo in a new video. He shows how to generate DESIGN.md files from Scratch, tweak values, then feed them back into Stitch. If you want to try it or suggest changes, the spec lives on GitHub under an open license. Between the explicit rules and built-in accessibility checks, DESIGN.md could cut down design hand-offs and rework. Teams can spend less time rewriting style guides and more time building features that match brand and compliance straight away.