Great reply, thank you!

I can see all the problems you mention, but I haven't started playing with the harnesses myself yet. Will read that repo when I get there.

Before reading you reply, I was under the vague impression that a harness really needed a lot of bells and whistles, and that it would be hard for FOSS to compete at pace with Claude Code or similar because of that only. But I see now there's a different path :)