This is a submission for the Hacktoberfest Open-Source AI Challenge Week 4: Ghost in the Machine

What I Built

I run coding agents all day. Claude Code in one terminal, Codex in another, sometimes three sessions on the same repo at once. They're the ghosts in my machine: they work where I can't see them, often while I'm asleep, and like any good ghost they leave slime behind.

One agent task looks like this. A fresh git worktree. Then npm install (a new node_modules ), uv sync (a new .venv ), cargo build (a few GB of target ). The package caches grow, the IDE indexes the new folder, and the session itself leaves a transcript, checkpoints and a scratch folder. Run five tasks in parallel and you get five of everything. The task gets merged, the worktree gets forgotten, the slime stays.

And if you run open-weight models locally, the old weights in ~/.ollama or the Hugging Face cache are the biggest blobs of all.

So I pointed my own disk cleaner at it.…