This is so good.
I've been working on my own GitHub bot that's similar to this.
I add it to my repositories, it assess the code, and then automatically makes PRs with improvements (mine's tweaked to performance & design).
It also takes production analytics into consideration.
You have Claude Fable for only a few days. Here's how to make the most of it.
Introducing /improve: use your most capable model to audit your codebase and write plans for cheaper models to execute later.
Studies your code, figures out bugs, perf, tech debt, missing tests, what to build and writes plans any agent can run.