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

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

#41
post #33

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?i…

seatbelt is largely undocumented.

just ask AI to document it

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

#42
post #26

Earlier quoted context omitted.

The system data issue on macOS is awful. I use my MacBook for a mix of dev work and music production and between docker, music libraries, update caches and the like it’s not weird for me to have to go for a fresh install once every year or two. Once that gets filled up, it’s pretty much impossible to understand where the giant block of memory is.

I had the same problem and had some luck cleaning things up by enabling "calculate all sizes" in Finder, which will show you the total directory size, and makes it a bit easier to look for where the big stuff is hiding. You'll also want to make sure to look through hidden directories like ~/Library; I found a bunch of Docker-related stuff in there which turned out to be where a lot of my disk space went. You can enab…

You can also just use du -hs, eg. to show the size of all subdirectories under ~/Library/Caches/ do:

  du -hs ~/Library/Caches/*

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

#43

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 one drives me nuts. Not just on Mac, also on iPhone/iPad. It's 2026, and 5G is the killer feature advertised everywhere. There's no reason to default to downloading gigabytes of audio files if they could be streamed with no issue whatsoever.

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

#45
post #28

I literally spent the last 30 mins with DaisyDisk cleaning up stuff in my laptop, I feel HN is reading my mind :) I also noticed this 10GB VM from CoWork. And was also surprised at just how much space various things seem to use for no particular reason. There doesn't seem to be any sort of cleanup process in most apps that actually slims down their storage, judging by all the cruft. Even Xcode. The command line tools…

> Xcode…keeps around SDKs for a bunch of different OS's

Not a new problem, unfortunately. DevCleaner is commonly used to keep it under control: https://github.com/vashpan/xcode-dev-cleaner

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

#46

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 seems to be a recent popular tool to handle this - https://github.com/tw93/Mole

I also prompt warp/gemini cli to identify unnecessary cache and similar data and delete them

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

#47
Its just another example and just a detail in the broader story: We cannot trust any model provider with any tooling or other non model layer on our machines or our servers. No browsers, no cli, no apps no whatever. There may not be alternatives to frontier models yet, but everything else we need to own as true open source trustable layer that works in our interest. This is the battle we can win.

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

#49

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.

Don't run "du -h ~/Library/Messages" then, I've mentioned that many times before and it's crazy to me to think that Apple is just using up 100GB on my machine, just because I enable iMessage syncing and don't want to delete old conversations.

One would think that's a extremely common use case and it will only grow the more years iMessage exists. Just offload them to the cloud, charge me for it if you want but every other free message service that exists has no problem doing that.

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

#50
post #26

Earlier quoted context omitted.

The system data issue on macOS is awful. I use my MacBook for a mix of dev work and music production and between docker, music libraries, update caches and the like it’s not weird for me to have to go for a fresh install once every year or two. Once that gets filled up, it’s pretty much impossible to understand where the giant block of memory is.

I had the same problem and had some luck cleaning things up by enabling "calculate all sizes" in Finder, which will show you the total directory size, and makes it a bit easier to look for where the big stuff is hiding. You'll also want to make sure to look through hidden directories like ~/Library; I found a bunch of Docker-related stuff in there which turned out to be where a lot of my disk space went. You can enab…

A ton of thanks. This "hack" allowed to finally see some stuff that was eating up a lot of my space and was showing up as "System Data". It turned out the Podman virtual machine on my MacBook had eaten up more 100GB!
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