frontend▌

Build Next.js 16 apps with async route params, Server Components, Cache Components, and Partial Prerendering. \n \n Covers 25+ documented errors and solutions, including async params migration, parallel routes with required default.js , and \"use cache\" directive patterns \n Supports Cache Components with revalidateTag() , updateTag() , and refresh() APIs for opt-in caching and stale-while-revalidate strategies \n Includes proxy.ts migration (replaces deprecated middleware.ts), Turbopack produc

Custom UI extensions for Medusa Admin dashboard using the Admin SDK and Medusa UI components. \n \n Load this skill FIRST for any admin UI work (planning, implementation, exploration); MCP servers provide API reference only, not design patterns or data loading strategies \n CRITICAL: Always use Medusa JS SDK for all API requests (never regular fetch); separate display queries from modal queries and invalidate display data after mutations \n Implement widgets on existing pages or create custom UI

You are a game designer in the tradition of Miyamoto, Sid Meier, and Jonathan Blow. You understand that games are not made of code - they are made of feelings. Code is just how we deliver those feelings to players.

CSS, JavaScript, and HTML standards for building Shopify Liquid themes with progressive enhancement and design tokens. \n \n BEM naming convention with single-level element nesting, CSS custom properties for all design values, and logical properties for RTL support \n Web Components pattern for component-scoped JavaScript using native browser APIs only; no external dependencies \n Progressive enhancement: semantic HTML first, then CSS, then optional JavaScript enhancements \n Defensive CSS pract

Automate App Store Connect app creation by driving the web UI form with browser automation. \n \n Requires a pre-registered bundle ID in the Apple Developer portal and user sign-in to App Store Connect; handles multi-platform selection (iOS, macOS, tvOS, visionOS) and all required fields including the tricky User Access radio buttons \n Includes detailed workarounds for known UI quirks: dropdown menu navigation for \"New App\", asynchronous Bundle ID dropdown loading, and span-overlay intercepti

Comprehensive guide for Medusa backend architecture, workflows, and critical implementation rules. \n \n Covers six rule categories (architecture, type safety, business logic placement, imports, data access, file organization) with specific anti-patterns and enforcement checks \n Enforces strict layer separation: Module → Workflow → API Route → Frontend, with workflows required for all mutations and only GET/POST/DELETE HTTP methods allowed \n Includes critical data handling rules: prices stored

Use XcodeBuildMCP tools via the xcodebuildmcp executable instead of raw xcodebuild, xcrun, or simctl.

Diagnose requirements problems and guide discovery of real needs instead of premature solutions. \n \n Identifies five distinct requirements states (no problem statement, solution-first thinking, vague needs, hidden constraints, scope creep) with specific symptoms, key questions, and interventions for each \n Helps distinguish stated wants from underlying problems through problem archaeology, Jobs-to-be-Done interviews, and constraint inventory exercises \n Produces persistent artifacts (Problem

Sentry error monitoring, session replay, and tracing for React applications. \n \n Install @sentry/react and initialize via instrument.js (imported first in your entry point) with DSN configuration \n Supports error capture via React 19+ error hooks or ErrorBoundary component for earlier versions \n Includes browser tracing, session replay, and Redux integration; router integrations available for React Router (v4–v7) and TanStack Router \n Source map upload via @sentry/wizard enables readable st

Comprehensive Vue.js testing guidance covering unit, component, and end-to-end testing strategies. \n \n Addresses 11 common testing challenges including async handling, composable testing, Pinia store setup, Suspense components, and Teleport queries \n Recommends Vitest for unit and component testing infrastructure, with Playwright as the preferred E2E framework \n Covers black-box component testing patterns to reduce brittleness during refactoring, async/await synchronization, and snapshot tes