[BUG] RPC error: failed to mount /mnt/.virtiofs-root/shared/Users... Causes Cowork to break. Complete reinstall needed.

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?

Bug Description
Claude Cowork created an artifact but couldn't find it because of confusion over the mount point. This bricked Cowork - I couldn't get it to respond without throwing this error. This persisted across Cowork sessions and restarts. I had to completely uninstall Claude Desktop and reinstall in order to use Cowork again.

Environment Info

• Platform: darwin
• Claude for Mac
• v1.7196.0 (2dbd78)

What Should Happen?

Cowork should place artifacts in the correct directory and know where to find them. If it can't be located, Cowork should error on the specific problem and continue to function normally.

Error Messages/Logs

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RPC error: failed to mount /mnt/.virtiofs-root/shared/Users/johndamask/Documents/Claude/Artifacts/bulk-nda-triage as .artifacts/bulk-nda-triage: source path is not accessible: /mnt/.virtiofs-root/shared/Users/johndamask/Documents/Claude/Artifacts/bulk-nda-triage: stat /mnt/.virtiofs-root/shared/Users/johndamask/Documents/Claude/Artifacts/bulk-nda-triage: operation not permitted
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Steps to Reproduce

Unclear but this has now happened twice. The general steps are:

1. Perform routine operation in Claude Cowork
2. Ask for an Artifact or Skill to be created
3. Roll the dice

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v1.7196.0 (2dbd78)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_