Apply this skill when building error handling, error boundaries, logging, monitoring, or observability in a Next.js + TypeScript + Drizzle application. Triggers on requests like "handle errors", "add error boundary", "add logging", "add monitoring", "set up Sentry", "why is this failing silently", "add a 404 page", or any time you are building features that need to handle failure gracefully. Use proactively — every new feature should account for error states.