I've also had a ton of luck getting agents to make focused, (mostly) well crafted commits using my home-grown git-based task manager: https://github.com/chiefnoah/tsk

It's very easy to be like: /tsk <big prompt> . Break down the problem into focused tasks using tsk, include all context necessary to complete a task in the tasks body, then prioritize them. Then begin working on them in priority order until complete.

Works 9/10 for me, though I often split up the instructions a bit so I have time to review the resulting tasks/design. tsk itself encourages creating single commits per task because it tracks the commit a task is closed on and the agents are pretty good about doing that.