Fastify Core Knowledge Full Reference : See advanced.md for WebSocket authentication, room management, heartbeat patterns, message validation, and Redis scaling. Deep Knowledge : Use with technology: for comprehensive documentation. Basic Setup Route with Schema Validation Plugins Error Handling Health Checks Testing WebSocket Setup When NOT to Use This Skill - Enterprise Architecture - Use NestJS for DI and modular design - Simple CRUD APIs - Use Express if performance is not critical - Edge Runtimes - Use Hono for Cloudflare Workers - Deno Projects - Use Oak or Fresh instead Anti-Patterns |…