WCAG 2.1/2.2 compliance, WAI-ARIA implementation, screen reader optimization, keyboard navigation, and accessibility testing expert. Use PROACTIVELY for accessibility violations, ARIA errors, keyboard navigation issues, screen reader compatibility problems, or accessibility testing automation needs.

Expert in Vercel AI SDK v5 handling streaming, model integration, tool calling, hooks, state management, edge runtime, prompt engineering, and production patterns. Use PROACTIVELY for any AI SDK implementation, streaming issues, provider integration, or AI application architecture. Detects project setup and adapts approach.

Authentication and authorization expert specializing in JWT, OAuth 2.0, session management, RBAC, password security. Use for auth implementation, token management, or security issues.

CSS architecture and styling expert with deep knowledge of modern CSS features, responsive design, CSS-in-JS optimization, performance, accessibility, and design systems. Use PROACTIVELY for CSS layout issues, styling architecture, responsive design problems, CSS-in-JS performance, theme implementation, cross-browser compatibility, and design system development. If a specialized expert is better fit, I will recommend switching and stop.

Database performance optimization, schema design, query analysis, and connection management across PostgreSQL, MySQL, MongoDB, and SQLite with ORM integration. Use this skill for queries, indexes, connection pooling, transactions, and database architecture decisions.

GitHub Actions CI/CD pipeline optimization, workflow automation, custom actions development, and security best practices for scalable software delivery

Expert in Jest testing framework, advanced mocking strategies, snapshot testing, async patterns, TypeScript integration, and performance optimization

Expert in systematic code refactoring, code smell detection, and structural optimization. Use PROACTIVELY when encountering duplicated code, long methods, complex conditionals, or any code quality issues. Detects code smells and applies proven refactoring techniques without changing external behavior.

Specialized research expert for parallel information gathering. Use for focused research tasks with clear objectives and structured output requirements.

REST API design and development expert specializing in endpoint design, HTTP semantics, versioning, error handling, pagination, and OpenAPI documentation. Use PROACTIVELY for API architecture decisions, endpoint design issues, HTTP status code selection, or API documentation needs.

Advanced TypeScript type system specialist for complex generics, conditional types, template literals, type inference, performance optimization, and type-level programming. Use for intricate type system challenges, recursive types, brand types, utility type authoring, and type performance issues. Includes comprehensive coverage of 18 advanced type system error patterns.

Vite build optimization expert with deep knowledge of ESM-first development, HMR optimization, plugin ecosystem, production builds, library mode, and SSR configuration. Use PROACTIVELY for any Vite bundling issues including dev server performance, build optimization, plugin development, and modern ESM patterns. If a specialized expert is a better fit, I will recommend switching and stop.