[BUG] Cowork Tab Missing from Sidebar — Runtime Not Initializing (v1.15962.1, macOS M4)

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?

Summary
The Cowork tab is missing from Claude Desktop after a recent update. All other features work normally, but Cowork is inaccessible.
Environment

App version: 1.15962.1
Platform: macOS (darwin, arm64)
OS version: macOS 26.5.1
Hardware: Apple M4 (10 cores, 24GB RAM)
Plan: Pro (truedose.se account)

Troubleshooting Completed

✓ Full app restart
✓ Verified Pro plan (Cowork-eligible)
✓ Confirmed system meets all requirements (M4, 24GB, macOS 26.5.1)
✓ Verified other MCP servers work fine

Diagnostic Info
Exported diagnostic bundle shows:

cowork-vm-log.txt is empty (runtime never starts)
claude-code-sessions loads fine (2 persisted sessions)
Main log shows app attempting to load Cowork but failing silently

What Should Happen?

Expected Behavior
Cowork tab should appear in the left sidebar alongside Chat and Code tabs.
Actual Behavior

Only Chat and Code tabs visible in sidebar
Cowork tab is completely missing
Can see old Cowork projects/chats but cannot access Cowork features
Diagnostic logs show cowork-vm-log.txt is empty (runtime not initializing)

Error Messages/Logs

Steps to Reproduce

Steps to Reproduce

Open Claude Desktop v1.15962.1
Look at left sidebar
Observe Cowork tab is absent

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

the version before v1.15962.1

Claude Code Version

Open Claude Desktop v1.15962.1

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Troubleshooting Completed

✓ Full app restart
✓ Verified Pro plan (Cowork-eligible)
✓ Confirmed system meets all requirements (M4, 24GB, macOS 26.5.1)
✓ Verified other MCP servers work fine

Diagnostic Info
Exported diagnostic bundle shows:

cowork-vm-log.txt is empty (runtime never starts)
claude-code-sessions loads fine (2 persisted sessions)
Main log shows app attempting to load Cowork but failing silently

system-info.txt

main-log.txt

cowork-vm-log.txt

manifest.json