[BUG] Cowork: "Claude Code process exited with code 1" on every prompt after latest update (macOS)

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?

After updating Claude Desktop to the latest version, every prompt submitted in any Cowork project or conversation immediately returns:

"Something went wrong — Claude Code process exited with code 1. You can restart the conversation from an earlier message."

This happens 100% of the time, across all projects and all new conversations. The issue persists after:

• Fully quitting and relaunching the app
• Running rm -rf ~/Library/Application\ Support/Claude/session-storage and relaunching
• Downloading a fresh installer from claude.com/download and reinstalling

The Chat tab appears unaffected. Only Cowork is broken.

What Should Happen?

Claude cowork should be able to process prompts.

Error Messages/Logs

Claude Code process exited with code 1

Steps to Reproduce

1. Open Claude Desktop
2. Navigate to any Cowork project (or start a new conversation in Cowork)
3. Type any prompt and submit
4. Observe: "Claude Code process exited with code 1" error immediately

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.3036.0 (cf521c) 2026-04-16T16:17:33.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

This regression appeared immediately after updating to the latest Claude Desktop version. The issue is 100% reproducible and affects all Cowork sessions. A clean reinstall from the latest installer at claude.com/download did not resolve it.