Design systemDesign Systems
Material Design 3
Google's design system, documented in exhaustive, agent-readable detail.

What it is
Material Design 3 (Material You) is Google's open design system covering colour, typography, elevation, motion, layout and every standard component, with guidance on when and how to use each. Code implementations exist for Android, Flutter and the web.
Why it’s here
You probably don't want your product to look like Material. You absolutely want to read how it reasons about colour roles, elevation and motion. The docs are a masterclass in explaining design decisions.
Best for
- learning design-system thinking
- colour roles
- motion guidelines
- Android apps
Can my agent use this?
Agent good agent friendlinessYes. The guidelines are public and well-structured. Link specific pages ("follow Material's guidance on elevation") rather than the whole system.
Good: Publicly accessible and useful to reference, but the agent will need to interpret it rather than install it.
Access methods
- Docs
- GitHub
- Public website
Related resources
Apple Human Interface Guidelines 
Apple Human Interface Guidelines
Apple's guidance on designing for iOS, macOS, watchOS and visionOS.
good agent friendlinessDesign systemFreeVercel Geist 
Vercel Geist
Vercel's design system: the reference for the modern developer-tool look.
good agent friendlinessDesign systemFreeStaff pickDESIGN.md Specification 
DESIGN.md Specification
Google Labs' open format for describing a visual identity to a coding agent.
excellent agent friendlinessDocumentationFreeOpen sourceStaff pickdesignmd.supply 
designmd.supply
Pre-generated DESIGN.md style guides for the world's best-known brands, MIT licensed.
excellent agent friendlinessCollectionFreeOpen source