asyncio

This skill provides comprehensive Go observability instrumentation using OpenTelemetry for distributed tracing, Prometheus for metrics collection, and structured logging with slog. Use it when instrumenting microservices for production monitoring, debugging distributed systems, or setting up operational dashboards. It covers everything from initializing tracers and metrics endpoints to implementing HTTP middleware and health checks.

This skill provides Jest with TypeScript configuration for industry-standard testing in JavaScript/TypeScript projects. It's ideal for testing existing Jest projects, React/Node.js applications with TypeScript, and migrating JavaScript projects to TypeScript. The setup includes Jest ecosystem tools, React Testing Library integration, snapshot testing, and built-in coverage reporting.

mypy is a static type checker for Python that enables gradual typing with type hints and comprehensive type safety. Use it to add type safety to Python projects, enforce type checking in CI/CD, and refactor code with type annotations. It supports strict mode, Protocol types, and integrates with frameworks like FastAPI and Django.

This skill enables professional Python testing with pytest, providing fixtures, parametrization, and mocking capabilities. It's ideal for writing unit/integration tests, TDD workflows, and testing async code across frameworks like FastAPI, Django, and Flask. Developers can quickly set up tests with fixtures, use parametrization for multiple scenarios, and run comprehensive test suites.