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A comment on Anthropic Cowork feature creates 10GB VM bundle on macOS without warning. Parent comment

Re:Anthropic Cowork feature creates 10GB VM bundle on macOS ... by radicality on Monday March 02, 2026 @12:05PM (#47220754)
I tried to use it right after launch from within Claude Desktop, on a Mac VM running within UTM, and got cryptoc messages about Apple virtualization framework.

That made me realize it wants to also run a Apple virtualization VM but can’t since it’s inside one already - imo the error messaging here could be better, or considering that it already is in a VM, it could perhaps bypass the vm altogether. Because right now I still never got to try cowork because of this error.

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Re:Anthropic Cowork feature creates 10GB VM bundle on macOS ... by lxgr on Monday March 02, 2026 @12:47PM (#47221380)
Does UTM/Apple's framework not allow nested virtualization? If I remember correctly from x86(_64) times, this is a thing that sometimes needs to be manually enabled.
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Re:Anthropic Cowork feature creates 10GB VM bundle on macOS ... by thomascountz on Monday March 02, 2026 @01:03PM (#47221622)
I've come across two different answers regarding Apple's Virtualization.Framework support for nested virtualization:

1. Yes, but only Linux guests 2. Yes, but only M3+

https://github.com/apple/container/issues/191

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Re:Anthropic Cowork feature creates 10GB VM bundle on macOS ... by PrairieFire on Monday March 02, 2026 @04:23PM (#47224296)
You are correct on both accounts, as of tahoe 26.3 you can't nest a macOS guest under a macOS guest. However you can nest 2 layers deep with any combo of layer 1 guest so long as the machine is running Sequoia and is M3/M4/M5.
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