Go Code Review Skill

Auto-triggers when reviewing Go code to catch common mistakes from https://100go.co/

Review Process

1. Read Go file(s) mentioned
2. Check against patterns in [[knowledge-base.md]]
3. Report issues with:
   • Severity (Critical/Major/Minor)
   • Location (file:line)
   • Mistake # from knowledge base
   • Suggested fix
   • Code example if applicable

Priority Checks

Critical (must fix):

• Error handling (#48-54): ignored errors, incorrect wrapping/comparison
• Concurrency (#58, 69, 70, 74): data races, mutex misuse, sync type copying
• Resource leaks (#26, 28, 76, 79): unclosed resources, memory leaks

Major (should fix):

• Interface design (#5-7): pollution, wrong side, returning interfaces
• Goroutine lifecycle (#62, 63): no stop mechanism, loop var capture
• Testing (#83, 86): no race flag, sleep in tests

Minor (consider):

• Code organization (#1, 2, 15): shadowing, nesting, missing docs
• Performance (#21, 27, 39): unoptimized init, string concat

Reference Knowledge Base

See [[knowledge-base.md]] for full 100 Go mistakes reference.

Example Output

**Issue**: Error not wrapped with context
**Severity**: Major
**Location**: handler.go:42
**Mistake**: #49 - Ignoring When to Wrap an Error
**Fix**: Use `fmt.Errorf("fetch user: %w", err)` instead of returning raw error
**Pattern**: Always wrap errors for context/traceability