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golang-safety

Defensive Golang coding against accidental bugs

golang-safety is an agent skill from the samber cc-skills-golang collection that guides a coding agent to write defensive Go code that avoids accidental bugs in normal, non-adversarial code. The skill distinguishes safety from security: security handles attackers, while safety protects against the programmer's own mistakes, such as panics, silent data corruption and surprising behaviour. Its practical rules include preferring generics over any when the set of types is known, using comma-ok type assertions, and knowing that a typed nil pointer stored in an interface is not equal to nil. It warns that writing to a nil map panics, so maps must be initialised before use, and that append can reuse a backing array, so two slices may silently share memory. It advises returning defensive copies from exported functions, extracting loop bodies that use defer into their own functions, and checking integer conversions, since int64 values wrap silently when converted to int32. It also notes that float arithmetic is not exact, so comparisons should use an epsilon or math/big, that zero values should be useful, and that sync.Once guarantees one-time initialisation under concurrency. The skill is listed on skills.sh, where the page shows install counts, GitHub stars and security audit results, all passing. Install it with npx skills add https://github.com/samber/cc-skills-golang --skill golang-safety.