If you're looking for an efficiency-focused harness, I had a pretty good time using the Dirac agent. The line-based anchors were slightly buggy though (this was a couple months ago) and would sometimes add the same line of code multiple times or leave an anchor in the output.
Creator of Dirac here. Came across this too late. The behavior you mentioned happens more commonly in smaller models, rarely in larger/frontier models. The underlying code is clean but the smaller models often make boundary errors (off by one type). Which models did you observe this with?
