[BUG] Chrome extension native host crashes on Windows - Bun internal assertion failure

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?

What's Wrong (description):

The Claude in Chrome extension cannot connect to Claude Code on Windows. The native messaging host process crashes immediately on spawn due to a Bun runtime internal assertion failure.

What Should Happen?

Expected behavior: The Chrome extension should connect to the Claude Code native host successfully.

Actual behavior: The native host crashes immediately due to a Bun runtime bug, preventing any browser automation.

Error Messages/Logs

**Error:** The native host binary crashes with a Bun assertion failure before any connection can be established. Chrome reports the extension is "not connected."

https://bun.report/1.3.5/e_11e86cebEugggC++08F+mvBoxhkf0389e__0shkwCA0eNrzzCtJLcpLzFFILC5OLSrJzM9TSEvMzCktSgUAiSkKPg

Steps to Reproduce

1. Install Claude Code v2.1.29 on Windows 11
2. Install the Claude in Chrome extension
3. Restart Chrome
4. Attempt to use any claude-in-chrome MCP tool — extension reports "not connected"
5. The native host process crashes on spawn with a Bun internal assertion failure

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Your version is 2.1.29

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

Environment:

• Claude Code version: 2.1.29
• OS: Windows 11 (build 26100), x86_64
• Node.js: v22.13.1
• Shell: Git Bash (MINGW64)
• Bun version bundled: 1.3.5 (from crash report URL)