I used Claude Code's /insights function. It gets Claude himself to go over your sessions and usage patterns. It'll produce an HTML report that you can view.

In my case Claude saw that code review was my main activity and that I was manually and repeatedly asking claude to "review X, Y, Z..." so he suggested turning it into a skill. So I fired up the superpowers:brainstorming skill and bikeshedded it until I ended up with this heavy duty massively parallel super reviewing super claude. Refined it a bit after a couple weeks of use and the result is what you see in my repository.