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Go error handling patterns including wrapping, custom error types, errors.Is/As, and error conventions. Use when handling, creating, or checking errors in Go.

Go performance optimizations including memory allocation reduction, efficient string building, I/O operations, and resource pooling. Use when optimizing Go code for speed or memory efficiency.

Go testing best practices including table-driven tests, race detection, test coverage, and mocking strategies. Use when writing or reviewing Go tests.

GraphQL resolver patterns including dataloader for N+1 prevention, context propagation, authorization, error handling, and validation. Use when implementing GraphQL resolvers.

GraphQL schema design including types, fields, pagination, nullability, naming conventions, and descriptions. Use when designing or modifying GraphQL schemas.

Next.js Metadata API for SEO, OpenGraph tags, structured data, and social sharing. Use when implementing metadata, SEO, or social media previews.

Next.js performance optimizations including next/image, next/font, dynamic imports, caching strategies, and bundle optimization. Use when optimizing Next.js apps for speed or Core Web Vitals.

Next.js App Router Server Components, Client Components, layouts, data fetching, and Server Actions. Use when working with Next.js app directory, component boundaries, or data fetching patterns.

Playwright best practices including selectors, wait strategies, accessibility testing, responsive design, and flaky-test prevention. Use when writing or improving Playwright E2E tests.