The setup is much simpler than you might think. I have 4 CLI tools I use for this setup. Claude Code, Codex, Copilot and Cursor CLI. I asked Claude Code to create a code reviewer "skill" that uses the other 3 CLI tools to review changes in detail and provide feedback. I then ask Claude Code to use this skill to review any changes in code or even review plan documents. It is very very effective. Is it perfect? No. Nothing is. But, as I stated before, this produces results that are better than what an average developer sends in for PR review. Far far better in my own experience.

In addition to that, we do use CodeRabbit plugin on GitHub to perform a 4th code review. And we tell all of our agents to not get into gold-plating mode.

You can choose not to use modern tools like these to write software. You can also choose to write software in binary.