Frontend

Biome all-in-one formatter and linter for JavaScript, TypeScript, JSX, TSX, JSON, and CSS.Zero-config setup, 15-20x faster than ESLint/Prettier. Use when working with modern JavaScript/TypeScriptprojects, setting up formatting/linting, or migrating from ESLint+Prettier to a faster alternative.

Develop, test, and document the PikaCSS monorepo (core engine, unplugin adapters, Vite/Nuxt plugins, docs site) using pnpm-based workflows.

Design and build software with high cohesion, low coupling, composition-first structures, and functional-style defaults (TigerStyle-inspired).

Execute Quarkus native image tests using GraalVM/Mandrel builder. This skill should be used when users request to run native tests, validate native compilation, test GraalVM compatibility, or verify native image functionality for Quarkus applications.

This skill provides unified expert-level guidance for terminal implementation in VS Code extensions. Covers xterm.js API and addons, VS Code terminal architecture, PTY integration, session persistence, input handling (keyboard/IME/mouse), shell integration with OSC sequences, and performance optimization. Use when implementing any terminal-related features.

Use this skill when implementing security measures or conducting security audits. Provides OWASP Top 10 mitigations, authentication patterns, input validation strategies, and compliance guidelines. Ensures applications are secure against common vulnerabilities.

CSS custom property architecture, theme systems, design token organization, and component library integration. Use when implementing design systems, theme switching, dark mode, or when the user mentions tokens, CSS variables, theming, or design system setup.

Design and implement React Server Components with Next.js 15 App Router. Master server-first architecture, streaming SSR, Server Actions, and modern data fetching patterns for 2025+ frontend development.

Comprehensive testing workflow that should be used proactively after ANY code changes. Covers immediate testing, recursive package validation with `...`, target determination for affected packages, and reverse dependency testing. Use this skill after modifying BUILD files, changing code, fixing tests, or before committing to ensure nothing breaks downstream. (project)

Develop, test, and document the PikaCSS monorepo (core engine, unplugin adapters, Vite/Nuxt plugins, docs site) using pnpm-based workflows.

HODD-RUST: Validation-first Rust development. Strictly validation-first before-and-after(-and-while) planning and execution. Merges Type-driven + Spec-first + Proof-driven + Design-by-contracts. Use for Rust projects requiring formal verification, safety proofs, comprehensive validation, or when working with unsafe code, concurrency, or FFI boundaries. This skill provides both reference documentation AND execution capabilities for the full PLAN -> CREATE -> VERIFY -> REMEDIATE workflow.

Modern Node.js development with Bun, Vite, Vue 3, Pinia, and TypeScript. CoversJavaScript/TypeScript projects, high-performance tooling, and modern frameworks.Use when user mentions Node.js, Bun, Vite, Vue, Pinia, npm, pnpm, JavaScript runtime,or building frontend/backend JS applications.

This skill provides comprehensive guidance for setting up and configuring test environments for VS Code extension projects. Use when initializing a new test infrastructure, configuring test runners (Mocha, Jest), setting up CI/CD test pipelines, integrating coverage tools (c8, nyc), or troubleshooting test configuration issues.

Optimizes prompts for LLMs and AI systems. Expert in crafting effective prompts for Claude 4.5, Gemini 3.0, GPT 5.1, and other frontier models. Use when building AI features, improving agent performance, or crafting system prompts.

This skill should be used when determining which Buck2 targets are affected by code changes for incremental builds and tests. Use this when users ask to test/build changed code, find affected targets, or run incremental workflows with jj revisions.

Create Claude Code rule files for .claude/rules/. Writes conventions and shared guidelines that auto-inject into context. Use for path-specific coding conventions or shared project guidelines. NOT for constitution/laws (use <law> in CLAUDE.md instead).

Follow established project structure, version control practices, documentation standards, and development workflows to maintain consistency across the team. Use this skill when organizing files and directories in a project. When writing README documentation or contributing guidelines. When creating git commits with clear messages or pull request descriptions. When managing environment configuration or dependencies. When setting up feature flags or maintaining changelogs. When establishing code review processes or testing requirements. This skill applies to all project management and development workflow tasks.

Idiomatic Rust development patterns for async applications. Covers error handling with Result/Option, ownership and borrowing, async/await with Tokio, traits and generics, serde serialization, Arc/Mutex for shared state, and clippy best practices. Use when writing Rust code, refactoring, handling errors, or implementing async patterns.

Svelte 5 runes guidance. Use for reactive state, props, effects, or Svelte 4→5 migration. Covers $state, $derived, $effect, $props, $bindable. Prevents mixing syntaxes and reactivity mistakes.

Write in Steven's voice—pragmatic, curious, pedagogical. Opens with measurable payoffs, builds mental models from first principles, uses worked examples, and handles uncertainty honestly. Use for essays, blog posts, and technical articles.