In your pipeline, the Claude Code session that implements a fix is then asked to review its own changes before merge. These reviews almost always approve, but human reviewers keep finding bugs afterwards. What is the most effective change?

Answer: C — Review the diff with an independent Claude Code instance, not the generating session

The session that generated the code carries its own reasoning and assumptions, so it tends to confirm its decisions when reviewing them. An independent review instance without that context is more effective at catching what the generator missed. (A), (B), and (D) all keep the review inside the biased session.