Force the (planning) agent to plan a specification for anything you're doing. Ask the agent to break it down into small steps that can be isolated commits. Review these steps as you feed them to the (coding) agent. Work through them one at a time.

Actually look at the diff that's produced.

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Basically, that's a clone of how I would work if I was the coder. I don't plan as well as agents, but I know what needs to happen better. But I work in small commits on isolated areas. The coding agent will screw things up if you have him winging it and making sweeping changes across a repo. So make it smaller, be specific, and maintain a traditional "small, non-breaking commit" workflow.