[BUG] CoworkVMService crashes when Browser panel tool is used to interact with a page

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?

CoworkVMService (the Windows service backing the in-app sandboxed Browser panel) crashes and restarts whenever the Browser panel tool is used to interact with a page (clicking, typing into forms). This happens repeatedly and reproducibly, not as a one-off. From the user's side it looks like the whole Claude app has crashed, since the crash takes the active session down with it.

A separate but possibly related symptom occurred earlier the same day: the app got stuck in a repair loop (Windows Service Control Manager repeatedly registering/disabling/crashing a service named "Claude") because a pending AppX package repair could not complete while the app was still running — see the second log excerpt below.

Environment

• OS: Windows 11 Home, build 10.0.26200
• Claude app package: Claude_1.32352.1.0_x64__pzs8sxrjxfjjc
• CPU/board: AMD system, ASUS ROG Strix X570-E Gaming
• Virtualization: enabled in BIOS (SVM Mode) and Windows (Virtual Machine Platform, WSL2) shortly before these crashes started, to support Docker Desktop for an unrelated local dev project

CoworkVMService crashing without a clean shutdown, correlated with Browser panel use (from C:\ProgramData\Claude\Logs\cowork-service.log):

What Should Happen?

Using the Browser panel tool to interact with a page (clicking, typing into forms) should work without crashing CoworkVMService or the app. The session should stay connected, and the app should remain open and responsive throughout.

Error Messages/Logs

Steps to Reproduce

1. Open a Claude Code session with the Browser panel (mcp__Claude_Browser__* tools)
2. Navigate the panel to a local web app (in my case a React Native / Expo web dev server on localhost)
3. Interact with the page via the panel's computer / form_input tools (e.g. fill a form, click a button)
4. Within seconds, the session drops and the desktop app becomes unresponsive or unreachable; reopening it fails with "Can't open this app," and "Repair" from the app-open error dialog does not fix it

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.229

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_