Web & Frontend

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Responsive design principles for stock_picker_bot web interfaces. Ensures stock data and portfolio management are usable on mobile, tablet, and desktop devices.

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Core coding principles and design aphorisms for writing maintainable code. Use when writing, reviewing, or refactoring code. Use it anytime you need to write code.

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Implement consistent error handling across the application. Use when adding try-catch blocks, error boundaries, or custom error classes.

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Follow project structure standards, environment variable management, Content Collections setup, version control practices, and build/deployment conventions. Use this skill when setting up project structure, managing configuration files, organizing dependencies, or establishing development workflows. When working on project directory structure and organization, environment variable files (.env, .env.local, .env.production), Content Collections configuration (src/content/config.ts), package.json and dependency management, git commit messages and branching strategy, configuration files (astro.config.mjs, tsconfig.json), build and deployment setups, or documentation files (README.md, ADRs).

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React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.

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React Specialist

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Core React 19 patterns including hooks, Suspense, lazy loading, component structure, TypeScript best practices, and performance optimization. Use when working with React components, hooks, lazy loading, Suspense boundaries, or React-specific TypeScript patterns.

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React 19 patterns and React Compiler behavior with Context shorthand syntax and use() hook. Use when working with Context, useContext, use() hook, Provider components, optimization patterns like useMemo, useCallback, memo, memoization, or when the user mentions React 19, React Compiler, Context.Provider, or manual optimization.

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Write, review, and refactor TypeScript for readability, type safety, and runtime correctness (Node.js/React/shared libs). Use when creating TS modules, modeling domain types, handling errors (Result/Either), validating external inputs (Zod/io-ts), organizing imports, or preventing cyclic dependencies. NOT for choosing design patterns (use design); NOT for shared platform library design (use platform).

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(ePost) Use when working with .tsx/.jsx files, React components, hooks, state management, or frontend UI

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Generate OpenAPI 3.1 specification from existing Next.js API routes. Use when asked to generate API docs, create OpenAPI spec, document endpoints, generate Swagger file, or create API documentation.

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Convert files and office documents to Markdown. Supports PDF, DOCX, PPTX, XLSX, images (with OCR), audio (with transcription), HTML, CSV, JSON, XML, ZIP, YouTube URLs, EPubs and more.

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Convert text to natural speech with DIA TTS, Kokoro, Chatterbox, and more via inference.sh CLI. Models: DIA TTS (conversational), Kokoro TTS, Chatterbox, Higgs Audio, VibeVoice (podcasts). Capabilities: text-to-speech, voice cloning, multi-speaker dialogue, podcast generation, expressive speech. Use for: voiceovers, audiobooks, podcasts, accessibility, video narration, IVR, voice assistants. Triggers: text to speech, tts, voice generation, ai voice, speech synthesis, voice over, generate speech, ai narrator, voice cloning, text to audio, elevenlabs alternative, voice ai, ai voiceover, speech generator, natural voice

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Optimize Next.js bundle size with code splitting, tree shaking, lazy loading, and build configuration. Apply when improving performance, reducing bundle size, analyzing dependencies, or optimizing load times.

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Analizador de rendimiento de código. Detecta N+1 queries, memory leaks, CPU bottlenecks, bundle size issues, rendering problems en React. Optimiza queries SQL, caching, lazy loading.

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Use when reviewing frontend security risks such as XSS, CSRF, sensitive data exposure, unsafe DOM APIs, untrusted user input, authentication/token handling, payment flows, file upload, CSP, dependency risk, or third-party scripts; Chinese triggers include 安全审查, 安全检查.

majiayu000 Bundle

This skill should be used when writing, reviewing, or improving RSpec tests for Ruby on Rails applications. Use this skill for all testing tasks including model specs, controller specs, system specs, component specs, service specs, and integration tests. The skill provides comprehensive RSpec best practices from Better Specs and thoughtbot guides.

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Write and run tests using Vitest with Astro integration — mock Cloudflare bindings, test API routes, validate schemas, and use test helpers. Use when the user mentions "testing", "tests", "vitest", "mock", "test helpers", "createMockEnv", "createMockContext", "write a test", or "run tests".

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Testing strategies with RTL and Jest/Vitest.

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（中文）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.

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Expert assistant for monitoring and optimizing performance in the KR92 Bible Voice project. Use when analyzing query performance, optimizing database indexes, reviewing React Query caching, monitoring AI call costs, or identifying N+1 queries.

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Provides web accessibility best practices for semantic HTML, ARIA, keyboard navigation, color contrast, and screen reader patterns. Use when building UI components, reviewing accessibility, or when user mentions 'a11y', 'accessibility', 'ARIA', 'screen reader', 'keyboard navigation', 'WCAG'.

majiayu000 Bundle

Comprehensive UI/UX design review with live environment testing, responsive validation, accessibility compliance (WCAG 2.1 AA), and visual consistency analysis using Playwright. Use when user runs /design-review, /review:design-review, requests a "design review", "UI review", "UX audit", or mentions "review the design", "check accessibility", "responsive testing".

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Build reusable, composable UI components with single responsibilities, clear prop interfaces, proper state management, and minimal coupling. Use this skill when creating React, Vue, Angular, or web components with well-defined APIs, sensible defaults, and documentation. Applies to component files, component libraries, design systems, or any modular UI code that should be maintainable, testable, and reusable across different contexts in the application.

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Create distinctive, production-grade frontend interfaces. USE THIS whenever the user asks to build web components, pages, dashboards, landing pages, React/Next/Vue components, HTML/CSS layouts, or when styling/beautifying any UI. Also use when creating posters, visual artifacts, or any web interface. This generates creative, polished code that prioritizes minimalist aesthetics with carefully crafted 3D effects and smooth interactions.

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Analyze and upgrade dependencies with breaking change detection. Use when updating frontend (pnpm) or backend (uv) dependencies.

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Advanced React hooks patterns including custom hooks, memoization, refs, reducers, and external store synchronization. Use when the user is writing custom hooks, optimizing React performance with useCallback/useMemo, managing complex state with useReducer, or integrating external state stores. Trigger on any mention of React hooks, custom hooks, memoization, re-render optimization, or rules of hooks violations.

majiayu000 Bundle

Professional JavaScript and TypeScript development skill covering modern ES6+, TypeScript, Node.js, Express, React, testing frameworks, and best practices. Use this skill when developing JavaScript/TypeScript applications, building React/Node.js projects, implementing RESTful APIs, or need guidance on modern JS/TS development patterns.

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Next.js 15+ App Router development patterns

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Master modern React state management with Redux Toolkit, Zustand, Jotai, and React Query. Use when setting up global state, managing server state, or choosing between state management solutions.

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Grafana alerts, Loki LogQL advanced queries, SLO dashboards, Telegram contact points, alerting rules for Laravel/Nginx/MySQL/Next.js

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This skill should be used when the user asks to "upload images to Cloudflare", "implement direct creator upload", "configure image transformations", "optimize WebP/AVIF", "create image variants", "generate signed URLs", "add image watermarks", "integrate with Next.js/Remix", "configure webhooks", "debug CORS errors", "troubleshoot error 5408/9401-9413", or "build responsive images with Cloudflare Images API".

majiayu000 Bundle

Use when moving expensive browser work off the main thread with Web Workers, SharedWorker, worker pools, Comlink, transferable objects, Vite/Webpack worker integration, or UI responsiveness fixes. Do not use for lightweight synchronous work or DOM manipulation; Chinese triggers include Web Worker, 后台线程, 主线程阻塞.

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Provides Better Auth integration patterns for NestJS backend and Next.js frontend with Drizzle ORM and PostgreSQL. Use when setting up Better Auth with NestJS backend, integrating Next.js App Router frontend, configuring Drizzle ORM schema, implementing social login (GitHub, Google), adding plugins (2FA, Organization, SSO, Magic Link, Passkey), implementing email/password authentication with session management, or creating protected routes and middleware.

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This skill should be used when the user asks to "add turnstile", "implement bot protection", "validate turnstile token", "fix turnstile error", "setup captcha alternative", or encounters error codes 100*/300*/600*, CSP errors, or token validation failures. Provides CAPTCHA-alternative protection for Cloudflare Workers, React, Next.js, and Hono.

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Production-ready authentication system for Next.js 15 + Supabase. Use when setting up auth, login, signup, OAuth, Google login, password reset, or user authentication.