Web & Frontend

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Next.js App Router patterns (15-16) - file-based routing, Server/Client Components, streaming, Suspense, metadata API, parallel routes, Server Actions, mutations, revalidation, Cache Components

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[Applies to: **/*.{js,jsx}] This guide provides definitive, opinionated best practices for writing high-performance, maintainable SolidJS applications, focusing on reactivity, component architecture, and common pitfalls.

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[Applies to: **/*.{js,jsx}] Definitive guidelines for using Zustand in React projects, focusing on type safety, modularity, performance, and maintainability with practical code examples.

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Use when building MCP Apps that serve interactive UI from MCP servers. Covers the ui:// URI scheme, HTML rendering in sandboxed iframes, and bidirectional communication between UI and host. USE FOR: rich UI in agent conversations, interactive dashboards from MCP servers, sandboxed iframe rendering DO NOT USE FOR: basic tool responses without UI (use mcp), agent communication (use a2a), full web applications

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Use when making backend architecture decisions — choosing API styles, database types, caching strategies, authentication mechanisms, and server-side design patterns for scalable, maintainable systems. USE FOR: backend architecture decisions, choosing API styles, choosing database types, server-side design patterns, backend system design DO NOT USE FOR: specific pattern details (use sub-skills: data-modeling, api-design, caching, authentication), frontend architecture (use dev/frontend), infrastructure (use iac)

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Use when writing or debugging regular expressions for pattern matching, validation, search, and text transformation. Covers regex syntax, common patterns, lookahead/lookbehind, character classes, quantifiers, and differences between regex flavors (PCRE, JavaScript, Python, .NET, POSIX). USE FOR: regular expressions, regex, pattern matching, text validation, search and replace, PCRE, regex lookahead, regex lookbehind, character classes, quantifiers, capturing groups, non-capturing groups, regex anchors DO NOT USE FOR: HTML/XML parsing (use a proper parser), complex data extraction (use jq or a programming language), natural language processing

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Use when modeling software architecture using the C4 model (Context, Container, Component, Code) by Simon Brown. Covers hierarchical system decomposition, Structurizr DSL, and C4 diagramming best practices. USE FOR: C4 model diagrams, system context diagrams, container diagrams, component diagrams, code-level diagrams, Structurizr DSL authoring, architecture decomposition, workspace definitions, C4 views and styles DO NOT USE FOR: general flowcharts (use mermaidjs), enterprise architecture frameworks (use togaf or archimate), data models (use erd)

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Use for WCAG compliance testing and assistive technology validation. Covers axe-core (programmatic API, Playwright/React integrations), Pa11y (CLI and CI runner), Lighthouse accessibility audits, Storybook addon-a11y, and WAVE. Includes WCAG 2.1/2.2 levels, common violations, automated vs manual testing guidance. USE FOR: axe-core, Pa11y, Lighthouse accessibility, WCAG compliance, Storybook addon-a11y, screen reader testing, accessibility audits, ARIA validation, Section 508 compliance, keyboard navigation testing DO NOT USE FOR: visual appearance testing (use visual-testing), functional E2E tests (use e2e-testing), performance audits (use performance-testing)

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[Applies to: **/*.{css,html,jsx,tsx,vue}] Provides definitive best practices for using Tailwind CSS, focusing on maintainability, performance, and scalability in modern web development.

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Design token architecture - primitive/semantic/component tiers, naming grammar, CSS custom property delivery, and DTCG build pipelines

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Frontend specification planning frameworks. Use when a spec touches UI components, forms, client state, or user-facing flows. Covers UI-state completeness (loading, error, empty, success), component boundaries, form validation contracts, state ownership, and measurable UI success criteria.

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Vue Test Utils — mount vs shallowMount, the wrapper API, awaiting DOM updates, flushPromises, testing composables, and the global mounting options. Load when writing or reviewing tests that mount Vue components.

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[Applies to: **/*] This guide provides opinionated, actionable best practices for using Chakra UI effectively, focusing on token-first theming, responsive design, component architecture, and performance for React 18+ applications.

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[Applies to: **/*.{js,jsx,ts,tsx,svelte}] Definitive guidelines for building scalable, performant, and maintainable SvelteKit applications using modern best practices, TypeScript, and Svelte 5 runes.

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[Applies to: **/*.{js,jsx}] This guide provides opinionated, actionable best practices for developing high-performance, maintainable, and secure applications using Turbopack as the default bundler in Next.js 16+.

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[Applies to: **/*] Definitive guidelines for building consistent, performant, and maintainable UIs with Ant Design v6.x, focusing on design tokens, layout, and component usage.

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React Native Reanimated 4 - shared values, animated styles, spring/timing/decay, layout animations, gesture integration, scroll-driven animations, interpolation, worklets, CSS animations

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WatermelonDB reactive local database for React Native - schema, models, decorators, reactive queries, relations, writers/readers, batch operations, migrations, sync

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Type-safe client-side routing for React with file-based routes, search params validation, loaders, and code splitting

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Progressive Web App architecture — service workers, web app manifest, caching strategies, offline support, push notifications, background sync, and Workbox. Covers the full lifecycle of building installable, offline-capable web applications. USE FOR: progressive web apps, service workers, offline support, caching strategies, web app manifest, Workbox configuration, push notifications, installability DO NOT USE FOR: SPA routing/state management (use spa), server-side rendering (use ssr), native mobile apps (use e2e-testing for Appium)

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Single Page Application architecture — client-side routing, state management, data fetching, bundle optimization, and the SPA vs MPA tradeoff. Covers React, Vue, Angular, Svelte, and Solid ecosystems. USE FOR: SPA architecture, client-side routing, state management patterns, data fetching strategies, bundle optimization, code splitting, lazy loading DO NOT USE FOR: server-side rendering (use ssr), progressive web apps (use pwa), micro-frontend composition (use micro-frontends)

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Server-Side Rendering, Static Site Generation, Incremental Static Regeneration, Islands Architecture, Streaming SSR, and React Server Components. Covers Next.js, Nuxt, Remix, SvelteKit, and Astro in depth. USE FOR: server-side rendering, SSG, ISR, Islands Architecture, streaming SSR, React Server Components, Next.js, Nuxt, Remix, SvelteKit, Astro, choosing between SSR vs SSG vs ISR DO NOT USE FOR: client-only SPAs (use spa), progressive web apps (use pwa), micro-frontend composition (use micro-frontends)

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[Applies to: **/*.{js,jsx,ts,tsx}] This guide provides opinionated, actionable best practices for building scalable and performant React applications using MobX, focusing on modern patterns and React Compiler compatibility.

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UI component review patterns. Use when reviewing React components, hooks, props, state, styling, and accessibility. Covers rules of hooks, effect cleanup, render performance, list keys, keyboard and ARIA patterns.

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Secure storage, certificate pinning, biometric auth, jailbreak detection, code obfuscation, network security, screenshot prevention for React Native

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CSS animation patterns - transitions, keyframes, scroll-driven timelines, @property, compositor-friendly properties, prefers-reduced-motion

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VitePress 1.x — Vue-powered static site generator for documentation sites, built on Vite

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React Query server state — query keys and query options, caching policy, error handling, and typed clients generated from an API schema

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Deep linking patterns - Universal Links (iOS), App Links (Android), URI schemes, expo-linking API, React Navigation linking config, Expo Router automatic linking, AASA/assetlinks.json setup, deferred deep links, testing

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USE FOR: Building enterprise .NET applications using Telerik UI components for Blazor, WPF, WinForms, or ASP.NET Core. Use when you need professional-grade data grids, editors, charts, and document processing with commercial support from Progress. DO NOT USE FOR: Open-source-only projects (Telerik requires a commercial license), simple prototypes where a lightweight component library suffices, or game development.

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[Applies to: **/*] This guide provides definitive rules for integrating and utilizing Font Awesome 7 icons, focusing on accessibility, performance, and maintainability through Kit-based setup and modern best practices.

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[Applies to: **/*] Provides definitive guidelines for building scalable, performant, and maintainable React applications using Material-UI (MUI), focusing on modern best practices.

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[Applies to: **/*.{js,jsx,ts,tsx}] Definitive guidelines for using TanStack Query (formerly React Query) to manage server state efficiently, ensure type safety, and optimize performance in React applications.

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React Native mobile development patterns - New Architecture (Fabric, TurboModules, JSI), component architecture, React Navigation 7+, FlashList v2 optimization, gestures with Reanimated 4, platform-specific code, React 19 features

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File-based routing and navigation for Expo/React Native

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Packaging React components as a consumable library — style delivery contracts, sideEffects, cascade layers, "use client" preservation, peer dependency ranges, server-safe vs client entries