[BUG] Cowork Crashing!

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?

Claude Desktop crashes on launch of conversation in Cowork on macOS Tahoe 26.4.1.

<img width="519" height="237" alt="Image" src="https://github.com/user-attachments/assets/a847f814-027d-4dad-897e-9cd241d154da" />

What Should Happen?

Should be able to have a conversation

Error Messages/Logs

Steps to Reproduce

Set up a project in cowork - try a chat within it

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.145

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_