[BUG] Cowork tab missing in desktop app v1.2773.0 on Windows 11 Enterprise

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?

The Cowork tab has disappeared from the Claude Desktop app. Previously working but now completely absent from navigation. No error message shown. Persists after restarting app and machine.

What Should Happen?

The Cowork tab should be visible and accessible in the top navigation alongside the Chat tab, as it was before. This is a regression — Cowork was previously working.

Error Messages/Logs

Steps to Reproduce

1. Launch Claude Desktop v1.2773.0 on Windows 11 Enterprise 2. Observe Cowork tab is absent 3. No error shown 4. Restart app — persists 5. Restart machine — persists

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

App: 1.2773.0 (884b37) · OS: Windows 11 Enterprise 25H2 · Build: 26200.8037

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

Yes — Cowork worked before and stopped. Related to #48407