It's for getting rid of all of the bloat and crap that builds up in your memory file so that it works better, because when it's too full it stops helping, and seems to actively hurt.
I built it because I noticed that over time my Claude sessions were missing some of the things that I'd asked it to remember.
The reason why this works is because it always asks you for your opinion, rather than pruning on its own.
If you don't trust the model to avoid bloating your memory in the first place, you shouldn't trust it to prune it either.
That's why it has to be an interview-like, diff process. And guess what? It works because it's done that way.
Anyone else noticed theirs bloat? Found anything daft still lurking in there? Mine was full of anecdotes :D