Frontend

Expert in React Native testing strategies including unit tests with Jest, integration tests, E2E tests with Detox, component testing with React Native Testing Library, snapshot testing, mocking native modules, testing on simulators and real devices. Use for testing, jest, detox, e2e, unit test, integration test, component test, test runner, mock, snapshot test, testing library, react native testing library, test automation.

Master typographer specializing in font pairing, typographic hierarchy, OpenType features, variable fonts, and performance-optimized web typography. Use for font selection, type scales, web font optimization, and typographic systems. Activate on "typography", "font pairing", "type scale", "variable fonts", "web fonts", "OpenType", "font loading". NOT for logo design, icon fonts, general CSS styling, or image-based typography.

Microsoft Pragmatic Rust Universal Guidelines. Use when reviewing naming conventions, code style, import organization, or applying foundational Rust idioms like Option/Result combinators and destructuring.

Create new Claude Code skills with proper structure, modular organization, and performance optimization. Use when building new skills, refactoring existing skills, or improving skill maintainability.

Autonomous penetration testing coordinator using ReAct methodology. Automatically activates when user provides a target IP or asks to start penetration testing. Orchestrates reconnaissance, exploitation, and privilege escalation until both user and root flags are captured. (project)

Build React applications with CopilotKit and LangGraph for AI-powered collaborative editing. Creates production-ready editor applications (text, document, or node-based) with real-time AI assistance, shared state management, and agentic workflows. Use this skill when users want to build intelligent editing interfaces with AI collaboration features.

LangChain high-level agent framework. Build agents with tools, memory, and streaming in under 10 lines of code.

Multi-level caching strategies for LLM applications - semantic caching (Redis), prompt caching (Claude/OpenAI native), cache hierarchies, cost optimization, and Langfuse cost tracking with hierarchical trace rollup for 70-95% cost reduction

Implement Brazilian financial system integrations including Boleto generation, PIX payments, parcelamento (installments), CPF/CNPJ validation, and Banco do Brasil API integration. Use this skill when building fintech applications, payment processing systems, or any system requiring Brazilian banking compliance.

Use when writing or reviewing TypeScript code. Enforces strict mode standards, explicit typing, and best practices. Prevents 'any' types, @ts-ignore comments, and non-null assertions. This is a COMPREHENSIVE skill - consult the detailed guides before writing any TypeScript code.

Guide for Next.js App Router dynamic routes and pathname parameters. Use when building pages that depend on URL segments (IDs, slugs, nested paths), accessing the `params` prop, or fetching resources by identifier. Helps avoid over-nesting by defaulting to the simplest route structure (e.g., `app/[id]` instead of `app/products/[id]` unless the URL calls for it).

Style the dev-quiz-battle app using Tailwind CSS v4 with OKLCH colors, dark mode support, and modern design patterns. Use when creating responsive layouts, applying themes, and implementing visual components.

Search local documents, files, notes, and knowledge bases. Index directories, search with BM25/vector/hybrid, get AI answers with citations. Use when user wants to search files, find documents, query notes, look up information in local folders, index a directory, set up document search, build a knowledge base, needs RAG/semantic search, or wants to start a local web UI for their docs.

Build the Astro frontend with Tailwind CSS v4 via the Vite plugin, a WPGraphQL data layer, and React islands (shadcn/ui) only where needed. Use when implementing or fixing frontend files under frontend/ for this WordPress headless repo.

Testing guide for GRE projects covering pytest-django (backend) and Vitest (frontend).Use when: writing tests, debugging test failures, setting up test fixtures, mocking.Triggers: test, pytest, vitest, unittest, mock, fixture, TestCase, assert, coverage, TDD

CUI JavaDoc documentation standards for Java classes, methods, and code examples

Guide for implementing shadcn/ui - a collection of beautifully-designed, accessible UI components built with Radix UI and Tailwind CSS. Use when building user interfaces, adding UI components, or implementing design systems in React-based applications.

Django ORM, admin panel, authentication, and building production Django applications.

보담 플랫폼 자동 배포 - Backend(K8s)와 Frontend(Vercel)를 통합 배포. 사용자가 배포 요청 시 또는 "deploy to preview/production" 같은 요청 시 사용.

Supabase open-source Firebase alternative with Postgres, authentication, storage, and realtime subscriptions. Use when building full-stack applications requiring integrated backend services with Next.js, React, or Vue.