Frontend

Reference and maintain documentation of the project's technical stack including frameworks, languages, databases, testing tools, and third-party services. Use this skill when choosing technologies for implementation, adding new dependencies or libraries, setting up project infrastructure, configuring build tools and package managers, integrating third-party services (authentication, email, monitoring), selecting appropriate frameworks for features, ensuring consistency with existing technology choices, documenting technology decisions, reviewing technology compatibility, or onboarding team members to the tech stack. Apply this skill when making technology decisions, adding new tools or services, documenting the stack, or ensuring new code aligns with the project's established technical architecture.

Expert knowledge of frontend JavaScript for API integration including fetch/axios patterns, async/await error handling, form validation and submission, pagination implementation, loading states, DOM manipulation, event listeners, query parameter building, and vanilla JS best practices. Use when working with public/script.js, adding UI features, debugging client-side API issues, implementing forms, or managing client-side state.

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. | Sử dụng khi: thiết kế frontend, wireframe, mockup, prototype.

Next.js 14+ App Router patterns, server components, and data fetching

Expert React - Hooks, composants, state management, data fetching, testing, styling et patterns modernes

Executes OpenAI Codex CLI for code analysis, refactoring, and automated editing. Activates when users mention codex commands, code review requests, or automated code transformations requiring advanced reasoning models.

Generate PPTX-compatible HTML slide decks for math worked examples. Use when user says "create worked example" or needs visual step-by-step math instruction with CFU questions and practice problems.

Angular 21+ testing infrastructure with fixtures, ng-mocks, component harness, AAA pattern, and Jest best practices for eliminating duplication

Production-ready React Native screen creator that implements screens following established project patterns, enforcing best practices (NO mock data, real Supabase queries, BaseScreen wrapper, safe navigation, analytics tracking). Use when user says "create screen", "implement screen", "build [ScreenName]", or after analyzing existing screen. ALWAYS reads PROJECT_MEMORY.md, applies ACCEPTANCE_CHECKLIST.md, and avoids known errors.

Implementation and troubleshooting agent - builds features and fixes bugs

Maintain Cupertino + Lumina visual consistency for the AERA frontend. Use when creating or modifying UI, CSS/tokens, layouts, components, menus/overlays, tables, charts, or interaction states in this repo.

Guide developers through API versioning strategies, deprecation workflows, and backward compatibility patterns

How tests should be structured, named, and prioritized in this codebase.

Manages local web server lifecycle and enables web page development with Playwright MCP. Use when developing HTML/CSS/JS, building web pages, viewing web pages, testing UI interactions, verifying renders, debugging frontend issues, or iterating on web design. Covers build, startup, shutdown, and browser-based testing workflows.

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.

Build Claude Code extensions - skills, agents, hooks, plugins, marketplaces, slash commands. Use when creating Claude Code components, building new skills, writing agents, creating hooks, making plugins, setting up marketplaces, writing slash commands, fixing extension configurations, or troubleshooting Claude Code extensions. Includes builder agents for autonomous creation. Not for looking up docs - use claude-code-docs-reference for that.

Review Server Actions for security, validation, and best practices in React 19. Use when reviewing forms, mutations, or server-side logic.

This skill should be used when the user asks about "DERIVE workflow", "effective development methodology", "research-backed approach", "structured development", "how to approach this task", or wants guidance on planning and executing software development tasks systematically. Provides the complete DERIVE methodology with research-backed evidence for each phase.

Implement features end-to-end in Laravel 12 + Inertia.js + React 19 + TypeScript. Use when buildingnew features, wiring controllers to pages, or implementing CRUD operations. EXCLUSIVE to fullstack-developer agent.

Build web applications with Svelte 5 runes, SvelteKit routing, form actions, and component patterns. Use when working with Svelte, SvelteKit, or building reactive web interfaces.