Review custom components and layouts against shadcn design patterns, theme styles (Maia, Vega, Lyra, Nova, Mira), component structure, composability, and Radix UI best practices. Use when planning new components, reviewing existing components, auditing spacing, checking component structure, or verifying shadcn best practices alignment.
Discover existing shadcn components from registries before building custom. Use PROACTIVELY when about to build any UI component, page section, or layout. Use when user explicitly asks to find/search components. Searches 1,500+ components across official and community registries including @shadcn, @blocks, @reui, @animate-ui, @diceui, Magic UI, and 30+ specialty registries. Provides install commands and code examples. Works best with shadcn MCP configured, but provides manual guidance without it.