I know that even a mediocre model in a great harness will perform amazingly. There are a lot of things that can go in a harness. Most of the stuff I read online is noise; it's actually just trying to sound smart, but when it comes to actual performance, it doesn't really result in it. Can someone here point to some no-bullshit guides about harness engineering?

Harness Engineering is a marketing term. In reality it’s just the practice of leveraging what has always defined a good stable codebase: good docs and high test coverage.