[BUG] Cowork crashes with "Claude Code process exited with code 1" on macOS - all new sessions affected

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?

Every new Cowork session crashes immediately with "Claude Code process exited with code 1". This happens on all new tasks, not just existing ones.

What Should Happen?

Cowork should process the task and respond normally, as it did before.

Error Messages/Logs

Claude Code process exited with code 1

Steps to Reproduce

1. Open Claude Desktop app on macOS
2. Navigate to Cowork
3. Create a new task
4. Send any message
5. Error appears immediately: "Claude Code process exited with code 1"

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.111 (Claude Code)

Platform

Other

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

• Issue started after the April 15, 2026 Anthropic outage
• Chat tab works fine, only Cowork is affected
• Tried: claude auth logout/login, deleted ~/.claude.json and ~/.claude/, reinstalled Claude Code, unset ANTHROPIC_API_KEY
• All new Cowork tasks fail, not just existing sessions