go-error-handling

name	go-error-handling
description	Validates Go error handling patterns

Go Error Handling Skill

Errors in Go are values and must always be handled. Ignored errors hide bugs. Unwrapped errors lose context. This skill enforces idiomatic, informative Go error handling.

1. [ ] All errors checked — never `_ = someFunc()` 2. [ ] Errors wrapped with `fmt.Errorf("...: %w", err)` to preserve context 3. [ ] `errors.Is` / `errors.As` used for comparison — never string matching 4. [ ] Errors returned early (fail fast, avoid deeply nested success paths) 5. [ ] Domain errors are sentinel values (`var ErrNotFound = errors.New(...)`) 6. [ ] Exported error variables for callers to compare against 7. [ ] No error swallowing in goroutines 8. [ ] Error messages are lowercase, no trailing punctuation (Go convention) BAD: `result, _ := repo.Find(id)` — error silently discarded BAD: `return fmt.Errorf("failed: %v", err)` — %v loses the error chain GOOD: `return fmt.Errorf("order service find: %w", err)` — %w preserves chain GOOD: `if errors.Is(err, ErrNotFound) { ... }` — type-safe comparison