Quality checkpoints at every development stage — pre-commit through post-deploy — with configuration examples, threshold tables, bypass protocols, and CI/CD integration. Use when setting up quality automation, configuring CI pipelines, establishing coverage thresholds, or defining deployment requirements.

React composition patterns for scalable component architecture. Use when refactoring components with boolean prop proliferation, building flexible component libraries, designing reusable component APIs, or working with compound components and context providers.

Horizontally-scalable WebSocket hub pattern with lazy Redis subscriptions, connection registry, and graceful shutdown. Use when building real-time WebSocket servers that scale across multiple instances. Triggers on WebSocket hub, WebSocket scaling, connection registry, Redis WebSocket, real-time gateway, horizontal scaling.

Patterns for creating design systems with personality and distinctive aesthetics. Covers aesthetic documentation, color token architecture, typography systems, layered surfaces, and motion. Use when building design systems that go beyond generic templates. Triggers on design system, design tokens, aesthetic, color palette, typography, CSS variables, tailwind config.

Next.js App Router best practices — Server Components, data fetching, caching, routing, middleware, metadata, error handling, streaming, Server Actions, and performance optimization for Next.js 14-16+.

Build beautiful native iOS/Android apps with Expo Router. Covers route structure, native tabs, animations, blur effects, liquid glass, SF Symbols, and platform patterns.

Manage knowledge graph for autonomous coding. Use when storing relationships, querying connected knowledge, building project understanding, or maintaining semantic memory.

Master advanced prompt engineering techniques to maximize LLM performance, reliability, and controllability in production. Use when optimizing prompts, improving LLM outputs, designing production prompt templates, or building AI-powered features.

Build and manage monorepos with Turborepo, Nx, and pnpm workspaces — covering workspace structure, dependency management, task orchestration, caching, CI/CD, and publishing. Use when setting up monorepos, optimizing builds, or managing shared packages.

When the user wants to add illustrations to an article or blog post. Triggers on: "illustrate article", "add images to article", "generate illustrations", "article images", or requests to visually enhance written content. Analyzes article structure, identifies positions for visual aids, and generates illustrations using a Type x Style two-dimension approach.

Comprehensive UI design skill covering fundamentals, patterns, and anti-patterns. Layout, typography, color, spacing, accessibility, motion, and component design. Use when building any web interface, reviewing design quality, or creating distinctive UIs.

WHAT: Production-ready Node.js backend patterns - Express/Fastify setup, layered architecture, middleware, error handling, validation, database integration, authentication, and caching. WHEN: User is building REST APIs, setting up Node.js servers, implementing authentication, integrating databases, adding validation/caching, or structuring backend applications. KEYWORDS: nodejs, node, express, fastify, typescript, api, rest, middleware, authentication, jwt, validation, zod, postgres, mongodb, redis, caching, rate limiting, error handling

[Alexa](https://developer.amazon.com/alexa) is Amazon's cloud-based voice service. Most people are familiar with the service through using an [Amazon Echo or Echo dot](https://developer.amazon.com/alexa/echo) but the service can also be integrated in to custom internet-connected devices like this talking robotic fish:

Structured decision-making patterns for common engineering choices — library selection, architecture, build vs buy, prioritization, reversibility analysis, and ADRs. Use when choosing between tools, architectures, or approaches, or when documenting technical decisions.

Unit, integration, and E2E testing patterns with framework-specific guidance. Use when asked to "write tests", "add test coverage", "testing strategy", "test this function", "create test suite", "fix flaky tests", or "improve test quality".

Postgres performance optimization and best practices from Supabase — covering indexing, connection management, RLS security, schema design, locking, data access patterns, and monitoring. Use when writing SQL, designing schemas, optimizing queries, or configuring Postgres.

Analyze projects and recommend observability integration. Use when adding observability to projects Claude Code works on.

> **WHAT**: Analyze and optimize marketing pages for higher conversion rates

Systematic task implementation using TDD, phase checkpoints, and structured commits. Ensures quality through red-green-refactor cycles, 80% coverage gates, and verification protocols before proceeding.

Practical estimation techniques for software tasks — methods comparison, decomposition, complexity multipliers, buffer calculation, bias awareness, and communication strategies. Use when estimating features, sprint planning, or presenting timelines to stakeholders.