Anthropic Cowork feature creates 10GB VM bundle on macOS without warning

Yup it uses Apple Virtualization framework for virtualization. It makes it so I can't use the Claude Cowork within my VMs and that's when I found out it was running a VM, because it caused a nested VM error. All it does is limit functionality, add extra space and cause lag. A better sandbox environment would be Apple seatbelt, which is what OpenAI uses, but even that isn't perfect: https://news.ycombinator.com/item?id=44283454

It's incredible how many applications abuse disk access.

In a similar fashion, Apple Podcasts app decided to download 120GB of podcasts for random reason and never deleted them. It even showed up as "System Data" and made me look for external drive solutions.

This GitHub issue itself is clearly AI slop. If you’ve been dealing with GitHub issues in the past months it will be obvious, but it’s confirmed at the end:

> Filed via Claude Code

I assume part of it is true, but determining which part is true is the hard part. I’ve lost a lot of time chasing AI-written bug reports that were actually something else wrong with the user’s computer. I’m assuming the claims of “75% faster” and other numbers are just AI junk, but at least someone could verify if the 10GB VM exists.

What's funny is interacting with it in claude code. Claude-desktop-cowork can't do anything about the VM. It creates this 10 GiB VM, but the disk image starts off with something like 6-7 GiB full already, which means any of the cowork stuff you try to do has to fit into the remaining couple of gigs. It's possible to fill it up, and then claude cowork stops working. Because the disk is full. Claude cowork isn't able to fix this problem. It can't even run basic shell commands in the VM, and Opus4.6 is able to tell the user that, but isn't smart enough/empowered to do anything about it.

So contrary to the github issue, my problem is that it's not enough space. So the fix is to navigate to ~/Library/Application\ Support/Claude/vm_bundles, and then ask Claude Code to upsize the disk to a sparse 60 GiB file, giving cowork much more space to work in while not immediately taking up 60 GiB.

Bigger picture, what this teaches me though, is that my knowledge is still useful in guiding the AI to be able to do things, so I'm not obsolete yet!

I imagined someone at Anthropic prompted "improve app performance", and this was the result.