Golang Concurrency Patterns

Teaches Claude about production-ready Go concurrency patterns with explicit goroutine lifetimes, context-based cancellation, and proper state protection. You get practical guidance on errgroup for fan-out/fan-in, bounding concurrency with semaphores, and avoiding the classic failure modes like goroutine leaks and data races. The skill is opinionated in a good way, calling out anti-patterns like fire-and-forget goroutines in handlers and time.After in hot loops. It's passed audits from Gen Agent Trust Hub, Socket, and Snyk. Useful when you're building Go services and want Claude to suggest concurrent designs that won't bite you in production.