Chrome native messaging host crashes on Windows (Bun panic - Internal assertion failure)

Bug: Chrome native messaging host crashes on Windows (Bun panic)

Environment

• Claude Code: v2.1.33
• OS: Windows 11
• Chrome: latest
• Extension: Claude in Chrome v1.0.45 (ID: fcoeoabgfenejglbffodgkkbkcdhcgfn)

Description

claude.exe --chrome-native-host crashes immediately with a Bun internal assertion failure. This prevents the Chrome extension from connecting to Claude Code via claude --chrome.

Steps to Reproduce

1. Install Claude Code v2.1.33 on Windows 11
2. Install "Claude in Chrome" extension
3. Run claude --chrome
4. Attempt any Chrome MCP tool → "Browser extension is not connected"

Crash Log

[Claude Chrome Native Host] Initializing...
[Claude Chrome Native Host] Creating socket listener: \.\pipe\claude-mcp-browser-bridge-<user>

Bun v1.3.5 (1e86cebd) Windows x64 (baseline)
panic(main thread): Internal assertion failure
oh no: Bun has crashed. This indicates a bug in Bun, not your code.

Crash Report URL

https://bun.report/1.3.5/e_11e86cebEkgggC++08F+mvBoxhkf0389e__0shkwCA0eNrzzCtJLcpLzFFILC5OLSrJzM9RSEvMzCktSgUAiSkKPg

Notes

• All configuration files are correct (native messaging host JSON, registry entries, bat file)
• claude install --force does not fix the issue (same version reinstalled)
• Previously worked, stopped working (likely after an update)
• Native messaging host config at: %APPDATA%\Claude Code\ChromeNativeHost\com.anthropic.claude_code_browser_extension.json
• Registry key exists at: HKCU\Software\Google\Chrome\NativeMessagingHosts\com.anthropic.claude_code_browser_extension