Typically I put the "why" of the commit in the body unless it's a super simple change, but that's a good point. Sometimes this function does generate a commit body to go with the summary, and sometimes it doesn't. It also has a habit of only looking at the first file in a diff and basing its messages off of that, instead of considering the whole patch.

I'll tweak the prompt when I have some time today and see if I can get some more consistency out of it.