[BUG] Failed to start Claude's workspace

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When attempting to use Claude Cowork i recieve the following message: Failed to start Claude's workspace
failed to add Plan9 share 'f': HcsWaitForOperationResult failed with HRESULT 0x80310000: {"Error":-2144272384,"ErrorMessage":""}
Restarting Claude or your computer sometimes resolves this. If it persists, you can reinstall the workspace.

I am using: Windows 11 Pro build 26200.8117

i have tried: WSL2 install, enabling both Windows features via dism, vmcompute restart, reinstall workspace

Note that Cowork was working but suddenly stopped working - giving the error message above

What Should Happen?

Cowork should start working again

Error Messages/Logs

Failed to start Claude's workspace
failed to add Plan9 share 'f': HcsWaitForOperationResult failed with HRESULT 0x80310000: {"Error":-2144272384,"ErrorMessage":""}

Steps to Reproduce

I dont know how to reproduce this. It occurred after Cowork was working perfectly - then it wasn't

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.1617.00

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

<img width="1172" height="920" alt="Image" src="https://github.com/user-attachments/assets/7cff6bf5-7cd2-42a6-8f45-cfd7fe013ba0" />