Coding standards, frameworks, refactoring, and code review (18.1K skills)
CLI code review — exit codes, cancellation and signals, non-TTY behaviour, the stdout/stderr split, error text, config precedence, subprocess safety and test adequacy. Load when reviewing a command-line tool's commands, entry point, prompts, output or tests, whichever parser or prompt library it uses.
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React Navigation 7+ patterns - static and dynamic APIs, type-safe navigation, stack/tab/drawer navigators, deep linking, authentication flows, screen preloading, header customization
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File-based routing and navigation for Expo/React Native
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WatermelonDB reactive local database for React Native - schema, models, decorators, reactive queries, relations, writers/readers, batch operations, migrations, sync
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React Native Gesture Handler - gesture types, GestureDetector, gesture composition, state machine, platform-specific gestures, swipeable rows, hover gestures
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Backend code review — injection and SSRF, boundary validation, object-level authorization, mass assignment and data exposure, error leakage, N+1 and unbounded queries. Use when a diff touches API routes or handlers, database access, auth middleware, or server code that reads files, starts processes or fetches URLs.
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CLI specification frameworks — flag contracts, prompt flows, config precedence, exit codes, output per context (TTY, piped, JSON), error and help text, signals and cross-platform behaviour. Use when a spec adds or changes a command surface, an interactive flow, a config key, an exit path or what a command prints.
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React Native performance profiling, optimization, and monitoring - JS/UI thread analysis, re-render prevention, list optimization, image performance, bundle size, startup time, memory leaks, React Compiler, New Architecture benefits
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BLE scanning/connecting/GATT operations with react-native-ble-plx, NFC tag reading/writing with react-native-nfc-manager, permissions, background mode, battery-efficient patterns
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React Native mobile development patterns - New Architecture (Fabric, TurboModules, JSI), component architecture, React Navigation 7+, FlashList v2 optimization, gestures with Reanimated 4, platform-specific code, React 19 features
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Serverless Redis-compatible key-value store via Upstash REST API -- edge-compatible, automatic JSON serialization, TTL-based caching
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Tauri 2.x Rust command patterns, state management, error handling, events, channels, testing
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OpenAPI 3.1 specification, schema design, code generation
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Express.js routes, middleware, error handling, request/response patterns
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Query optimization, caching, indexing, connection pooling, async patterns
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Persistent storage, SQLite databases, and credential management in Electron apps
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Fastify routes, JSON Schema validation, plugin system, TypeScript type providers
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Elasticsearch patterns -- client setup, index management, search DSL, aggregations, vector search, bulk operations, deep pagination
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Node.js CLI development with Commander.js and @clack/prompts - command structure, interactive prompts, wizard state machines, config hierarchies, exit codes, cancellation handling
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Chroma vector database -- collection management, automatic embedding, metadata filtering, document storage, query patterns
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Serverless PostgreSQL on Vercel with edge-compatible SDK
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GraphQL API server with Apollo Server — schema, resolvers, context, error handling, data sources, plugins
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NestJS backend framework - modules, controllers, services, DI, guards, pipes, interceptors, exception filters, middleware, DTOs with class-validator
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Weaviate vector database patterns with weaviate-client v3 -- collection management, vectorizer modules, hybrid search, filtering, generative search (RAG), multi-tenancy, batch imports
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