[BUG] VS Code Extension Crash - Bun Runtime Error (Exit Code 3) on Windows

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?

Description

The VS Code extension crashes immediately on launch with exit code 3. The CLI version works correctly in terminal.

## Environment

• OS: Windows 11 with WSL2 (Linux 5.15.167.4-microsoft-standard-WSL2)
• VS Code Extension: anthropic.claude-code-2.1.22-win32-x64
• Bundled Bun Version: 1.3.5
• CLI: Works normally in terminal (both Windows cmd and WSL2)

## Root Cause

The extension's bundled Bun runtime crashes with an integer overflow panic:

```
Bun v1.3.5 (1e86cebd) Windows x64 (baseline)
Windows v.win11_dt
CPU: sse42 avx avx2
RSS: 2.85GB | Peak: 2.85GB | Commit: 2.89GB | Faults: 708097 | Machine: 33.76GB

panic(thread 26700): integer does not fit in destination type
oh no: Bun has crashed. This indicates a bug in Bun, not your code.
```

Bun crash report URL:
https://bun.report/1.3.5/e_11e86cebGugogCw+kiM65ioJgqpmMCYKERNEL32.DLLut0LCSntdll.dll4zijBA0eNoFwcENACAMAsBVWM1ENHyosXzc3js53LyYxYYrWApkTHbkEZWRd/gBNAAPKQ

## Additional Errors in Logs

Before the crash:

• MCP server "claude-vscode" Failed to fetch tools: MCP error -32601: Method not found
• ripgrep abort errors: rg error (signal=undefined, code=ABORT_ERR, stderr: ), 0 results

## Steps to Reproduce

1. Install Claude Code extension v2.1.22 in VS Code on Windows 11
2. Open any folder/workspace
3. Attempt to launch Claude Code from the extension
4. Extension crashes with exit code 3

## Troubleshooting Attempted

1. Verified CLI works correctly (claude --version, claude auth status) - works fine
2. Created missing skills directories that were causing ENOENT errors:

• C:\Users\[username]\.claude\skills
• C:\ProgramData\ClaudeCode\.claude\skills

1. Fully uninstalled extension, closed VS Code, manually deleted extension folder, reinstalled - same crash
2. Restarted VS Code and Windows - same crash

## Expected Behavior

Extension should launch without crashing.

## Logs

See attached claude_extension_crash_trimmed.log for relevant crash details.

What Should Happen?

No error message when the extension opens

claude_extension_crash_trimmed.log

Error Messages/Logs

Steps to Reproduce

Open Claude Code VS Extension window and wait a moment

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

?? I auto-update extension

Claude Code Version

2.1.22

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_