Frontend

Comprehensive SEO optimization for web applications. Use when asked to improve search rankings, add meta tags, create structured data, generate sitemaps, optimize for Core Web Vitals, or analyze SEO issues. Works with Next.js, Astro, React, and static HTML sites.

Build accessible user interfaces following WCAG guidelines with semantic HTML, keyboard navigation, screen reader support, and proper color contrast. Use this skill when creating or modifying UI components, implementing form inputs, adding interactive elements, working with navigation menus, creating modals or dialogs, or handling focus management. Apply when working on React component files (*.tsx, *.jsx), Shadcn/ui components, or any frontend code that users interact with. This skill ensures semantic HTML elements (nav, main, button, etc.) that convey meaning to assistive technologies, keyboard navigation with visible focus indicators (focus:ring-2 focus:ring-offset-2 in Tailwind), sufficient color contrast ratios (4.5:1 for normal text), descriptive alt text for images and meaningful labels for form inputs, screen reader testing and verification, ARIA attributes for complex components when semantic HTML isn't sufficient, logical heading structure (h1-h6 in proper order), and proper focus management in dyna

Audio, video, and voice components for Composable Svelte. Use when implementing audio players, video embeds, or voice input. Covers AudioPlayer (Web Audio API), VideoEmbed (YouTube/Vimeo/Twitch), and VoiceInput (MediaRecorder) from @composable-svelte/media package.

Comprehensive prompt engineering framework for designing, optimizing, and iterating LLM prompts. This skill should be used when users request prompt creation, optimization, or improvement for any LLM task, or when users need help translating vague requirements into effective prompts through collaborative dialogue and iterative refinement.

Guidance for building, refactoring, and debugging Expo + React Native apps (including Expo Router). Use when wiring screens/layouts, navigation (tab/stack) scaffolding with `_layout.tsx` per group, avoiding unwanted redirects in `app/index.tsx`, theming, data fetching with React Query/fetch, Expo module usage, offline handling, and running local Expo tooling (install/start/lint).

Enriches Jira tasks with comprehensive context, requirements analysis, and technical details through intelligent extraction, dependency mapping, and historical analysis

Structured incremental development workflow that enforces explicit scoping before implementation. Use when: (1) User says 'build', 'implement', 'develop', 'create feature', or 'add functionality', (2) Task involves multiple files or could have ripple effects, (3) User wants to avoid scope creep or premature implementation, (4) Breaking down complex tasks into verifiable steps. This skill prevents AI agents from jumping into code without a validated plan.

UIコンポーネント、スタイリング、レイアウト、デザインシステムを作成する際にブランド一貫性のあるデザインガイドラインを適用する。フロントエンドコンポーネントの構築、デザイン実装、ビジュアル/UXに関する議論の際に使用。Nyatinte BlogのNord風ダークテーマ（Polar Night背景とFrostアクセント）への準拠を保証する。

Use when animating any UI element not covered by specific skills, or when applying general animation principles across multiple element types

Suite of tools for creating elaborate, multi-component claude.ai HTML artifacts using modern frontend web technologies (React, Tailwind CSS, shadcn/ui). Use for complex artifacts requiring state management, routing, or shadcn/ui components - not for simple single-file HTML/JSX artifacts.

Explicit accessibility enhancement and validation for generated UI code. Only invoke when user explicitly requests accessibility review, a11y enhancement, or WCAG compliance check.

Adding data-slot attributes for CSS targeting and component documentation

Build accessible web interfaces following WCAG guidelines and assistive technology best practices. Use this skill when creating or modifying UI components that need keyboard navigation, screen reader support, or ARIA attributes. When working on files like components/, pages/, or any file with interactive elements, forms, modals, or dynamic content. When adding alt text to images, labels to form inputs, or managing focus in single-page applications. When implementing color contrast, heading structure, or semantic HTML elements.

Integrates SQLite embedded database with Node.js using better-sqlite3 for synchronous operations or the native Node.js SQLite module. Use when building applications with local storage, embedded databases, or when user mentions SQLite, better-sqlite3, or embedded SQL.

UI component library templates (buttons, forms, cards, modals, etc.). Use when generating frontend UI components.

CSS animations, transitions, and scroll-driven effects with accessibility (prefers-reduced-motion). Use when adding motion, hover effects, loading states, or scroll-based animations.

Spin up local servers and execute dynamic user acceptance testing with Playwright. This skill starts the full stack (backend + frontend), constructs user journeys based on what was just built, and verifies functionality in a real browser.

Build timeout-resistant Claude Code workflows with chunking strategies, checkpoint patterns, progress tracking, and resume mechanisms to handle 2-minute tool timeouts and ensure reliable completion of long-running operations.

Analyze gaps between codebase and PRD documentation, generate discrepancies report. Use this skill when you need to sync documentation with implementation, find undocumented features, or identify unbuilt requirements.

Guides structured evaluation of design options with trade-off analysis. Use this skill when choosing architectures, selecting technologies, evaluating implementation approaches, or making design decisions.