Build Node.js, Express, and TypeScript APIs with consistent structure. Separate request handling, business logic, and database access, while following guidance for input validation, error tracking, configuration, and tests when adding features or refactoring existing services.

• Adding an API endpoint
• Separating business logic from database access
• Standardizing input validation and error handling

Add Sentry error reporting and performance monitoring to services, scheduled jobs, and database operations. Follow examples for capturing exceptions with useful context and measuring execution time through spans, which record individual operations for investigation.

• Adding error reporting to an API
• Recording failures and execution time for scheduled jobs
• Measuring database and asynchronous operations

Build React and TypeScript pages with guidance for data fetching, loading states, styling, and navigation. Organize code by feature and apply lazy loading, which loads components when needed, using patterns for MUI v7 and TanStack Router/Query.

• Creating a React page or component
• Organizing frontend files by feature
• Coordinating data fetching and loading states

Create and maintain Claude Code skills with clear file structure and activation rules. Get guidance on hooks, which run at specific workflow events, plus troubleshooting, edit restrictions, and splitting detailed instructions into reference files.

• Creating a new Claude Code skill
• Tuning skill activation conditions
• Investigating missing or unwanted activation