What problem does it solve? Building UIs that correctly follow Google's Material Design 3 spec requires knowing dozens of design tokens, component variants, adaptive layout rules, and platform differences, which is error-prone when done from memory. ## Core Features & Use Cases - Token and component guidance: Covers the full md.sys token system (color, typography, shape, elevation, motion) and 30+ components with Compose and @material/web mappings. - Adaptive layout patterns: Provides canonical layouts (feed, list-detail, supporting pane), window size classes, foldable posture handling, and responsive navigation patterns. - MD3 compliance audit: Scores an app or page across 10 categories (color, typography, shape, accessibility, etc.) and produces a prioritized fix report. - Use Case: Ask for a responsive app shell with a navigation rail on tablets and bottom bar on phones, and receive spec-correct Compose or web code using proper tokens. ## Quick Start Use the material-3 skill to build a Jetpack Compose settings screen with dynamic color and a navigation bar.