Make it review itself.
You can't review code like a senior developer yet. The agent can get close, if you ask the right questions in a fresh session.
Five Review Prompts
Security
“Review this change for security issues.”
Edge cases
“What happens with empty, huge or strange inputs?”
Critique
“What would a senior developer criticise here?”
Waste
“Is anything unused, duplicated or overcomplicated?”
Explain
“Explain this change to a new team member.”
Fresh eyes. Specific questions.