14 Apple HIG skills (foundations, platforms, patterns, inputs, technologies, and 8 component categories) plus an MCP server (hig_list_skills / hig_lookup / hig_audit) and a Bun-based CLI auditor that detects 348 HIG patterns across SwiftUI, UIKit, React, Vue, Svelte, Angular, Compose, Flutter, and React Native.
Add the marketplace (inside Claude Code):
/plugin marketplace add raintree-technology/hig-doctorInstall the plugin:
/plugin install apple-hig-skillsDesign fluency for frontend development. 1 skill with 23 commands (/impeccable polish, /impeccable audit, /impeccable critique, etc.) and curated anti-pattern detection.
Curated upstream: Vercel-Labs React/Next.js skills — performance best practices, composition patterns (compound components, render props), and React Native / Expo conventions for mobile.
Build agents that speak your UI