Depends on how you use these harnesses, I don't interact with any of them directly for example, but have my own harness around them, mostly so I can collect all the different ones under one "roof". With that, comes certain expectations of where things live. Anything that has "CC uses file path X" for example would require refactoring/changes, compared to other agents. Contrived example, but sometimes it's more than just "mv AGENTS.md CLAUDE.md".