Frontend

Guide experienced developers through GREEN phase of TDD cycle - writing minimal implementation to pass failing tests

Configure PrismaClient for serverless (Next.js, Lambda, Vercel) with connection_limit=1 and global singleton pattern.

Define UI tokens, accessibility rules, and consistent component behavior for the Astro frontend, plus empty/loading/error states and light hover/focus transitions. Use when adding or refining frontend UX polish and documentation under frontend/ in this repo.

Convert RxJS observables or decorator-based code to Angular signals. Use when refactoring to signals, converting @Input/@Output to signal functions, or replacing BehaviorSubject with signal().

Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.

Design and refactor React/Tailwind frontends using the project design system. Use this Skill when working on UI components, pages, layouts, or UX improvements and you want distinctive, accessible, non-generic designs that avoid AI slop.

Use when completing tasks, implementing major features, or before merging to verify work meets requirements

Comprehensive integration skill for building sites with SvelteKit 2, Svelte 5, and Tailwind CSS v4. Enhanced with Svelte MCP integration.

Guide for using FFmpeg - a comprehensive multimedia framework for video/audio encoding, conversion, streaming, and filtering. Use when processing media files, converting formats, extracting audio, creating streams, applying filters, or optimizing video/audio quality.

Build Model Context Protocol servers for Claude Code integration

Evaluates Next.js routes and outputs optimal revalidate settings, cache tags for ISR, SSR configurations, or streaming patterns. This skill should be used when optimizing Next.js caching strategies, configuring Incremental Static Regeneration, planning cache invalidation, or choosing between SSR/ISR/SSG. Use for Next.js caching, revalidation, ISR, cache tags, on-demand revalidation, or rendering strategies.

React 컴포넌트 생성, shadcn/ui 통합 작업 시 사용. component, 컴포넌트, UI, shadcn 키워드에 자동 활성화.

Generate diagrams and flowcharts from mermaid definitions using the mermaid-cli (mmdc). Supports themes, custom CSS, and various output formats including SVG, PNG, and PDF. Mermaid supports 20+ diagram types including flowcharts, sequence diagrams, class diagrams, state diagrams, entity relationship diagrams, user journeys, Gantt charts, pie charts, quadrant charts, requirement diagrams, GitGraph, C4 diagrams, mindmaps, timelines, ZenUML, Sankey diagrams, XY charts, block diagrams, packet diagrams, Kanban boards, architecture diagrams, radar charts, and treemaps. This skill is triggered when the user says things like "create a diagram", "make a flowchart", "generate a sequence diagram", "create a mermaid chart", "visualize this as a diagram", "render mermaid code", or "create an architecture diagram".

Expert knowledge of WAI-ARIA (Accessible Rich Internet Applications). Use when users ask about ARIA roles, states, properties, accessible name computation, ARIA attributes (aria-label, aria-labelledby, aria-describedby, etc.), widget roles, landmark roles, live regions, ARIA best practices, or how to implement accessible interactive components. Also use for questions about ARIA specifications, API mappings (core-aam, html-aam), digital publishing ARIA (dpub-aria), graphics ARIA, or any ARIA implementation questions.

Audit and refactor Tailwind CSS usage for consistent theming across the codebase. Detects hardcoded colors, arbitrary values, and inconsistencies, then guides file-by-file updates with user approval.

Enforces TypeScript strict mode compliance, eliminates any types, ensures type safety, and maintains strict linting standards. Use when TypeScript errors occur, any types need elimination, or strict mode compliance is required.

Structure React 19+ components following best practices for organization, state management, props handling, and code readability with top-down structure and single responsibility principle. Use this skill when creating new React components, refactoring existing components, organizing component logic, managing component state, defining prop interfaces (IComponentProps with I prefix), or implementing component patterns. Apply when working on React component files (*.tsx, *.jsx), Shadcn/ui components, or any frontend component implementations. This skill ensures predictable top-down structure (imports → types/interfaces → component → hooks → derived values → JSX), proper props destructuring with defaults in function signature, manageable component size (split at >300 lines), composition via Shadcn Slot pattern (asChild prop), React 19 patterns (use() hook for promises, useActionState for forms, useOptimistic for immediate feedback), no manual useMemo/useCallback (React Compiler handles memoization), Server Compo

Deploy Next.js applications (App Router and Pages Router) to Cloudflare Workers using the OpenNext adapter. This skill should be used when deploying Next.js apps with SSR, ISR, or server components to Cloudflare's serverless platform. It covers setup for both new and existing projects, configuration requirements, development workflows, integration with Cloudflare services (D1, R2, KV, Workers AI), and prevention of 10+ documented errors including worker size limits, runtime compatibility, database connection scoping, and security vulnerabilities.Keywords: Cloudflare Next.js, OpenNext Cloudflare, @opennextjs/cloudflare, Next.js Workers, Next.js App Router Cloudflare, Next.js Pages Router Cloudflare, Next.js SSR Cloudflare, Next.js ISR, server components cloudflare, server actions cloudflare, Next.js middleware workers, nextjs d1, nextjs r2, nextjs kv, Next.js deployment, opennextjs-cloudflare cli, nodejs_compat, worker size limit, next.js runtime compatibility, database connection scoping, Next.js migration

Create distinctive, production-grade frontend interfaces with high design quality. Use this skill when the user asks to build web components, pages, or applications. Generates creative, polished code that avoids generic AI aesthetics.

Provides comprehensive guidance for writing efficient, maintainable, and scalable code using industry-standard programming principles. Use this skill when designing, implementing, or reviewing code to ensure adherence to best practices.