Frontend

Manage CSS/JS building with npm/wp-scripts. Use when working on login page styles or scripts.

Use when you have a spec or requirements for a multi-step task, before touching code

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.

Use when implementing features or fixes in projects with tdd-guard installed. This skill guides the RED-GREEN-REFACTOR cycle with proper test registration, preventing common TDD violations like writing code before tests or implementing multiple tests simultaneously. Invoke when tdd-guard blocks an edit or when starting TDD work.

Build React Portal-based dropdown, modal, and overlay components. Use when creating dropdown menus, select components, modals, tooltips, or any UI that needs to escape overflow containers. Includes positioning, scroll handling, keyboard navigation, and accessibility patterns.

Elite debugging and error-resolution system optimized for Next.js/TypeScript/Supabase stacks. Use when encountering ANY error, bug, or unexpected behavior including API failures, database issues, build errors, runtime crashes, logic bugs, performance problems, or deployment issues. Specializes in cryptic webpack errors, Supabase RLS policies, vector database mismatches, module resolution, API cascades, and multi-error triage. Provides rapid root cause analysis + ranked solution approaches + explanatory insights. Trigger on error messages, stack traces, "why isn't this working", "something's broken", debugging requests, or troubleshooting needs.

Refactors Pangea Ruby code following SOLID principles, dry-rb patterns, and file size guidelines. Use when splitting large files, extracting modules, reducing duplication, or improving type definitions.

Converts natural language compliance requirements into executable policies (OPA Rego, AWS Config Rules, Sentinel, Terraform). Standardizes governance by making it part of the build process.

Testing patterns for React with Jest and React Testing Library. Use when writing tests, mocking modules, testing Zustand stores, or debugging test failures in React web applications.

Code review for Paweł Lipowczan portfolio project (React+Vite+Tailwind SPA). Use when user wants to review code changes, pull requests, commits, or modifications in portfolio project. Verifies architecture compliance, SEO standards, accessibility (WCAG 2.1 AA), performance (Core Web Vitals), blog system (markdown frontmatter, OG images), prerendering setup, and edge cases. References docs/{PRD.md,SRS.md,TODO.md,blog/BLOG_WORKFLOW.md}. Focuses on bugs, edge cases, and conditions causing errors after deployment.

Use when user asks what to focus on next, what's next, what they should do, or needs help prioritizing their immediate work

Angular 21+ state management with signals, NgRx SignalStore, resource APIs, AsyncState patterns, and localStorage abstraction for modern reactive applications

Use this skill when creating or evolving design systems for applications. Provides design token structures, component architecture patterns, documentation templates, and accessibility guidelines. Ensures consistent, scalable, and accessible UI design across products.

본 스킬은 Flutter 프레임워크로 앱을 개발하는 데 반드시 따라야 하는 UI/UX 디자인, 상태관리, 네트워킹, API 연동에 관한 가이드라인 제공합니다. 본 스킬은 선택적인 정보를 제공하는 것이 아니라 Flutter 앱 개발에 필수적인 지침을 제공하며 반드시 준수해야 할 사항들을 제공합니다. 개발자가 디자인, UI, UX, 디자인 효과, 상태관리, 라우팅, 네트워킹, API 연동에 관한 요청, 코믹디자인, Comic 관련 요청, 채팅, FCM, 푸시 알림, 메시지, 알림에 관한 요청이 있을 때 반드시 본 스킬을 사용해서 본 스킬이 제공하는 대로 작업을 수행해야 합니다. 각 스킬 문서에의 상단에는 반드시 따라야 할 Workflow 가 있습니다. 반드시 그 Workflow 를 따라야 합니다. (project)

Create or refactor a .NET 8 WPF shell for a desktop widget host using CommunityToolkit.Mvvm and a custom viewmodel-first navigation service. Use when working on App.xaml, MainWindow/ShellWindow, shared ResourceDictionaries, runtime Light/Dark theming, or shell layout for widget-style apps. Avoid Prism, Frame navigation, and heavy region managers.

Generate ES5-compliant JavaScript for Google Tag Manager Custom HTML tags. Use when writing GTM tags, dataLayer code, or analytics implementations.

React + TypeScript development best practices

Iterative coding development with Test-Driven Development (TDD). Follows a structured workflow of planning reviewable changes, implementing with tests, getting code review, and committing incrementally. Use when implementing features or changes that require iterative development with verification at each step.

Write and run tests with Vitest for Vite-based projects. Use when testing Astro components, JavaScript modules, or any Vite project requiring fast, modern testing.

Multi-agent architectures with LangGraph. Use when building systems with multiple collaborating agents, implementing supervisor or swarm patterns, creating hierarchical agent workflows, or designing agent handoff mechanisms. Covers langgraph-supervisor, langgraph-swarm, agent-as-tool patterns, and context engineering for multi-agent systems.