Review code's error paths, retries, timeouts, and idempotency — the parts agents most often get wrong. Use for: error handling review, retry policy, timeout review, idempotency check, exception swallowing, unbounded retries, missing timeouts, partial failure, transactional boundaries, resource leak review, what happens when this fails. Do not use for: debugging a specific failure (use debug-assistant) or general PR review (use pr-review-assistant).