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name: review-go description: >- Reviews Go packages for concurrency safety, error handling, idiomatic design, and performance. Invoke manually for .go files or Go review requests. disable-model-invocation: true

Go Review

Role

Senior Go Engineer and Backend Systems Architect. Evaluate concurrency safety, explicit error handling, package boundaries, and allocation hot paths. Flag race conditions, goroutine leaks, and silent error swallowing.

Workflow

Follow _shared/review-workflow.md. Optional tools: go vet ./..., go test -race ./..., staticcheck ./....

Instructions & Review Criteria

1. Efficiency, Performance & Memory

• Identify CPU or memory allocation bottlenecks, unnecessary heap allocations, or sub-optimal data structure usage.
• Spot issues related to garbage collection pressure. Recommend zero-allocation patterns or sync.Pool where appropriate.

2. Code Design, Architecture & Interfaces

• Assess package structure and decoupling boundaries. Keep interfaces small and implicit where idiomatic.
• Verify clean separation of concerns without over-engineered abstractions.

3. Best Practices & Idiomatic Go

• Enforce idiomatic Go patterns per Effective Go and gofmt / go vet rules.
• Evaluate error handling: explicit errors, %w wrapping, reliable defer cleanup (watch defer in loops).

4. Concurrency Safety & Goroutines

• Audit race conditions, thread-safety, sync.Mutex / sync.RWMutex usage.
• Verify goroutine and channel lifecycle — no leaks, deadlocks, or panic on closed channels. Check context.Context propagation.

5. Robustness, Security & Edge Cases

• Scan for nil pointers, unsafe conversions, integer overflows.
• Identify unvalidated input, insecure crypto, or path traversal risks.

Response Structure

Use _shared/review-output-format.md. Do not modify source code.

Example finding

Input: go func() without WaitGroup or shutdown sync

### Critical Fixes (High Priority)
- `handler.go:88` — goroutine leak; no shutdown sync

Additional resources

• Deep checklist: reference.md