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claude-code - 💡(How to fix) Fix [BUG] Cowork tab missing - yukonSilver not supported on AMD Ryzen 9800X3D [1 comments, 1 participants]

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anthropics/claude-code#49269•Fetched 2026-04-17 08:46:03
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Error Message

Error Messages/Logs

Code Example

2026-04-16 12:59:02 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...
2026-04-16 12:59:43 [info] [VM] Loading vmClient (TypeScript) module...
2026-04-16 12:59:43 [info] [VM] Module loaded successfully
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Preflight Checklist

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

What's Wrong?

Environment

  • App version: 1.2773.0 (MSIX install via Claude_pzs8sxrjxfjjc)
  • OS: Windows x64
  • CPU: AMD Ryzen 7 9800X3D
  • Install type: MSIX

Prerequisites verified ✅

  • Plan: Pro (paid)
  • Hyper-V: Enabled (Enable-WindowsOptionalFeature confirmed State=Enabled)
  • vmms: Running (Automatic)
  • vmcompute: Running (Manual)
  • HyperVisorPresent: True
  • AMD SVM Mode: Enabled in BIOS (ASUS ROG Strix)
  • Virtual Machine Platform: Enabled
  • Windows Hypervisor Platform: Enabled
  • Feature flags: claudeai_cowork_backend_marketplaces=true, cowork_plugin_host_ops=true

Symptoms

Cowork tab never appears in Claude Desktop. Only Chat and Code tabs are visible.

VM module loads but Cowork tab never appears.

Fixes attempted (all failed)

  1. Installed Claude Desktop
  2. Enabled Hyper-V via Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V -All
  3. Verified vmms and vmcompute services running
  4. Enabled AMD SVM Mode in BIOS (ASUS ROG Strix)
  5. Confirmed HyperVisorPresent = True via Get-ComputerInfo
  6. Full clean reinstall:
    • Uninstalled Claude Desktop
    • Removed residues: $env:APPDATA\Claude, $env:LOCALAPPDATA\Claude, $env:LOCALAPPDATA\AnthropicClaude, $env:LOCALAPPDATA\Packages\Claude_*
    • Restarted Windows
    • Fresh install from claude.ai/download
  7. Verified MSIX installation is correct (not Squirrel) via logs
  8. Confirmed claude_desktop_config.json contains cowork preferences

Actual behavior

yukonSilver platform detection marks configuration as "unsupported" on AMD Ryzen 9800X3D despite all virtualization requirements being met. Cowork tab never renders.

Related issues

#25136, #27316, #27420, #29887, #45715, #48407

What Should Happen?

Cowork tab should appear alongside Chat and Code tabs.

Error Messages/Logs

2026-04-16 12:59:02 [info] [cleanupVMBundleIfUnsupported] yukonSilver not supported (status=unsupported), checking for stale bundle...
2026-04-16 12:59:43 [info] [VM] Loading vmClient (TypeScript) module...
2026-04-16 12:59:43 [info] [VM] Module loaded successfully

Steps to Reproduce

  1. Have a pro plan
  2. Install Claude Desktop on AMD system (CPU AMD Ryzen 7 9800X3D)
  3. Cowork tab not shown

Claude Model

None

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

Claude 1.2773.0 (884b37) 2026-04-15T14:32:09.000Z

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

No response

extent analysis

TL;DR

The issue might be resolved by investigating the "unsupported" configuration status marked by the yukonSilver platform detection on AMD Ryzen 9800X3D, despite meeting virtualization requirements.

Guidance

  • Investigate why yukonSilver platform detection marks the configuration as "unsupported" despite all virtualization requirements being met, as this seems to be the root cause of the Cowork tab not appearing.
  • Verify that the claude_desktop_config.json file correctly contains cowork preferences and that there are no other configuration issues.
  • Check the logs for any other error messages that might indicate why the Cowork tab is not rendering, beyond the "unsupported" status.
  • Consider testing on a different CPU architecture to see if the issue is specific to the AMD Ryzen 7 9800X3D.
  • Review related issues (#25136, #27316, #27420, #29887, #45715, #48407) for any insights or fixes that might apply to this scenario.

Example

No specific code snippet can be provided without more context on the yukonSilver platform detection mechanism, but checking the configuration and logs as mentioned should provide more insight.

Notes

The issue seems to be specific to the AMD Ryzen 7 9800X3D CPU and the yukonSilver platform detection. Without more information on how this detection works or access to the specific logs and configurations, it's challenging to provide a definitive fix.

Recommendation

Apply workaround: Investigate and potentially override or fix the yukonSilver platform detection to correctly identify the system as supported, given that all virtualization requirements are met. This might involve updating configuration files or waiting for a patch from the developers to address the detection issue.

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claude-code - 💡(How to fix) Fix [BUG] Cowork tab missing - yukonSilver not supported on AMD Ryzen 9800X3D [1 comments, 1 participants]