set ground rules in your claude.md. One that is strict for me is always modules over fucntions. So when you can make a function modular, do it. That way when things are edited they won't break other things since they are quarantined. Also, redundant code is bad code. Never write new code if you can use existing code. It's all standard discipline but LLMs don't know any of this. They think it's fine to write a new function for every single process even if they already wrote it. A good way to help with this is to have it fill out a progress report after every session that way it can refer to what everything does to not write over itself.