TailwindCSS v4 patterns with CSS-first configuration using @theme, @source, and modern CSS features. Covers design tokens, CSS variables, container queries, dark mode, and Vite integration. Use when configuring Tailwind, defining design tokens, or leveraging modern CSS with Tailwind utilities.
Predefined design system references for UI reviews. Includes Material Design 3, Apple Human Interface Guidelines, Tailwind UI, Ant Design, and Shadcn/ui. Use when conducting design reviews against established design systems.
Use when implementing React 19 features, optimizing components, or choosing between Actions vs TanStack Query for mutations. Covers React Compiler optimization, Server Actions, Forms, and new hooks.
Use when optimizing performance or reviewing security. Covers code-splitting, React Compiler patterns, asset optimization, a11y testing, and security hardening for React apps.
Comprehensive TanStack Query v5 patterns for async state management. Covers breaking changes, query key factories, data transformation, mutations, optimistic updates, authentication, testing with MSW, and anti-patterns. Use for all server state management, data fetching, and cache invalidation tasks.
Use when setting up route loaders or optimizing navigation performance. Integrates TanStack Router with TanStack Query for optimal data fetching. Covers route loaders with query prefetching, ensuring instant navigation, and eliminating request waterfalls.
CSS Modules with Lightning CSS and PostCSS for component-scoped styling. Covers *.module.css patterns, TypeScript integration, Vite configuration, and composition. Use when building complex animations, styling third-party components, or migrating legacy CSS.
Use when setting up new projects or updating tool configurations. Configures Vite, TypeScript, Biome, and Vitest for React 19 projects. Covers build configuration, strict TypeScript setup, linting/formatting, and testing infrastructure.
Track progress in multi-phase workflows with Tasks system. Use when orchestrating 5+ phase commands, managing iteration loops, tracking parallel tasks, or providing real-time progress visibility. Trigger keywords - "phase tracking", "progress", "workflow", "multi-step", "multi-phase", "tasks", "tracking", "status".
Batch all related operations into single messages for maximum parallelism and performance. Use when launching multiple agents, reading multiple files, running parallel searches, optimizing workflow speed, or avoiding sequential execution bottlenecks. Trigger keywords - "batching", "parallel", "single message", "golden rule", "concurrent", "performance", "sequential bottleneck", "speed optimization".
Deep OWASP API Security Top 10 testing for REST, GraphQL, gRPC, and WebSocket APIs — BFLA, mass assignment, rate limiting, and unsafe consumption.
Use when designing REST or GraphQL APIs, defining endpoints, implementing pagination/filtering, handling API versioning, or establishing API documentation with OpenAPI/Swagger.
Use when implementing authentication (JWT, sessions, OAuth), authorization (RBAC, ABAC), password hashing, MFA, or security best practices for backend services.
Use when implementing custom error classes, error middleware, structured logging, retry logic, or graceful shutdown patterns in backend applications.
YAML format for Claude Code agent definitions as alternative to markdown. Use when creating agents with YAML, converting markdown agents to YAML, or validating YAML agent schemas. Trigger keywords - "YAML agent", "agent YAML", "YAML format", "agent schema", "YAML definition", "convert to YAML".
Configuration reference and troubleshooting for the statusline plugin — sections, themes, bar widths, and script architecture
Instructions for updating the supported Model Context Protocol (MCP) specification version in the `dart_mcp` package.
Use when choosing state management solutions, implementing global stores (Zustand, Pinia), managing server state (TanStack Query), or handling URL state in frontend applications across React and Vue.
Use when building Vue 3 applications with TypeScript, implementing Composition API components, setting up Pinia stores, or working with Vue Router. Covers script setup, composables, and reactive state.
Use when implementing clean architecture (routes/controllers/services/repositories), establishing camelCase conventions, designing Prisma schemas, or planning structured workflows for Bun.js applications. See bunjs for basics, bunjs-production for deployment.
