Frontend

Production patterns for managing complex application state in React without Redux, Zustand, or other state libraries. Includes multi-stage loading, command patterns, refs for performance, and parallel data fetching. Use when building complex UIs with interconnected states, need loading stages and progress tracking, or implementing command patterns.

Provides code review guidelines, checklists, and best practices for reviewing pull requests. Use when reviewing code, preparing for code review, or when users mention "code review", "review PR", "review checklist", or "code quality".

Teaches code splitting with lazy() and Suspense in React 19 for reducing initial bundle size. Use when implementing lazy loading, route-based splitting, or optimizing performance.

Creating and Optimizing Claude Code Skills. Design reusable knowledge capsules with progressive disclosure (metadata → content → resources). Apply freedom levels (high/medium/low), create examples, validate YAML. Use when building domain-specific guidance or automating recurring patterns.

Expert in color theory, palette harmony, and perceptual color science for computational photo composition. Specializes in earth-mover distance optimization, warm/cool alternation, diversity-aware palette selection, and hue-based photo sequencing. Activate on "color palette", "color harmony", "warm cool", "earth mover distance", "Wasserstein", "LAB space", "hue sorted", "palette matching". NOT for basic RGB manipulation (use standard image processing), single-photo color grading (use native-app-designer), UI color schemes (use vaporwave-glassomorphic-ui-designer), or color blindness simulation (accessibility specialists).

Deep CSS analysis tool for understanding specificity, cascade order, inheritance chains, and computed styles. Visualizes CSS complexity and suggests simplifications. Use when debugging specificity issues or understanding CSS behavior.

This skill should be used when performing local data exploration, profiling, quality analysis, or transformation tasks using DuckDB. It handles CSV, Parquet, and JSON files, provides automated data quality reports, supports complex JSON transformations, and generates interactive HTML reports for data analysis.

FlexLayout for React - Advanced docking layout manager with drag-and-drop, tabs, splitters, and complex window management

Test-Driven Development skill. Generates unit tests before implementation. Adapts to project type (Chrome extension, React, Express, Python, etc.). Reads/updates pattern library.

Provides guidance and reusable assets for implementing navigation in Next.js App Router. Covers file-based routing, dynamic routes, layouts, loading/error UI, protected routes with middleware, and navigation patterns like Link, useRouter, and redirect. Use when working on routing or navigation tasks in a Next.js App Router project.

Use when implementing Tailwind CSS styling. Prefer utility-first composition and responsive patterns.

Guide for building fullstack applications with Vue 3, FastAPI, Docker, and MySQL. Use this skill when developing or debugging applications using this specific technology stack including frontend (Vue 3, Element Plus, Pinia, Vue Router, Axios, Vite), backend (FastAPI, SQLAlchemy, Pydantic, JWT), containerization (Docker, Docker Compose), database (MySQL 8.0+), RESTful API design, authentication, and deployment workflows.

Pre-built and custom Clerk authentication component templates with theming and customization patterns. Use when building authentication UI, creating sign-in/sign-up pages, customizing Clerk components, implementing user buttons, theming auth flows, or when user mentions Clerk components, SignIn, SignUp, UserButton, auth UI, appearance customization, or authentication theming.

Check TypeScript compilation errors, run build commands, and validate the codebase. Use when the user mentions TypeScript errors, build issues, compilation problems, or wants to verify code integrity.

Create distinctive, production-grade frontend interfaces with high design quality. Use this skill when the user asks to build web components, pages, artifacts, posters, or applications (examples include websites, landing pages, dashboards, React components, HTML/CSS layouts, or when styling/beautifying any web UI). Generates creative, polished code and UI design that avoids generic AI aesthetics.

Comprehensive Supabase development expert covering Edge Functions, database schema management, migrations, PostgreSQL functions, and RLS policies. Use for any Supabase development including TypeScript/Deno Edge Functions, declarative schema management, SQL formatting, migration creation, database function authoring with SECURITY INVOKER, and RLS policy implementation with auth.uid() and auth.jwt().

Generate Drupal/Twig component skeletons with web components and Miyagi validation. Use when user requests to create, scaffold, or add a new component at a specific path (e.g., "add component skeleton at patterns/share-button"), or when creating component files including Twig templates, CSS, JavaScript web components, JSON schemas, or mock data files.

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.

Comprehensive guide to React component patterns used in the Plataforma B2B de treinamento técnico corporativo educational platform. This skill covers functional components with hooks, composition patterns, state management, props flow, and error handling strategies essential for building maintainable React applications.Learn how to create reusable, testable components following React best practices while avoiding common antipatterns like prop drilling, unnecessary class components, and improper state management. The skill emphasizes composition over inheritance, unidirectional data flow, and separation of concerns.Real-world examples are taken directly from the project codebase, including CLearningSystem, BashLearningSystem, Breadcrumb, AreaCard, and FlashcardModal components. Each pattern is demonstrated with production code showing how architectural decisions were implemented in a 5,500+ line React application with 17 components.Key topics include functional components (vs class components), React Hoo

Interpretive guidance for Ruby code quality using RuboCop (configurable) or StandardRB (zero-config). Use when linting Ruby files, configuring Ruby tools, troubleshooting lint errors, or understanding tool selection.