[BUG] Claude Code installed app - Windows - Crashes every prompt

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?

<img width="1200" height="800" alt="Image" src="https://github.com/user-attachments/assets/9ac6c880-5dd7-4fa6-bc3b-3dec7255827d" />

<img width="1200" height="800" alt="Image" src="https://github.com/user-attachments/assets/9321ef2f-5908-4257-9b4b-b54c53f6cd76" />

Title: [BUG] Claude Code subprocess exits with code 1 in Desktop on Windows; Cowork and Code both broken, Chat works, /doctor itself crashes

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report
• [x] I am using the latest version of Claude Code

What's Wrong?

In Claude Desktop on Windows, the bundled Claude Code subprocess fails immediately on every launch. Symptoms:

• Cowork tab: sending any message returns "Something went wrong / Claude Code process exited with code 1" (screenshot attached)
• Code tab: every session crashes with "Claude Code crashed" before any response. Even /doctor crashes the same way (screenshot attached) — the diagnostic command can't run.
• Chat tab: works normally. Auth, network, and Anthropic services are confirmed reachable.

Failure is 100% reproducible across every new session.

Environment

• OS: Windows 11
• Hardware: intel i9
• Claude Desktop version: brand new fresh install
• Plan: Max
• Feedback ID: in-app feedback also crashes; no ID available

What I've Already Tried

• Cleared in-app cache + restarted — no change
• Full uninstall: removed app, %APPDATA%\Claude, %LOCALAPPDATA%\Claude, all caches and prefs
• Fresh download + reinstall from claude.ai/download — no change. (Suspected the versioned claude-code\<version>\ subdir survived; will re-test with that explicitly deleted.)
• Confirmed Chat tab works — auth, network, services all reachable
• Standalone Claude Code CLI via npm install -g @anthropic-ai/claude-code [works / also crashes — fill in]

What Should Happen?

Expected Behavior

Claude Code subprocess should launch and respond to prompts in both Code and Cowork tabs.

Error Messages/Logs

None found

Steps to Reproduce

Steps to Reproduce

1. Launch Claude Desktop (loads fine)
2. Open Code tab → New session → type any prompt (e.g. /doctor)
3. Subprocess exits with code 1, error banner appears, no output ever rendered
4. Same behavior in Cowork tab on any new task

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.133

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_