[BUG] process exited with code 1

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?

Error: Claude Code process exited with code 1
I know there are many reports about this bug, but I want to share the issue I discovered!

What Should Happen?

When I define CLAUDE.md in my project and include content in the format of "half-width space + @ + alphanumeric characters," I get the error: Error: Claude Code process exited with code 1!

<img width="889" height="289" alt="Image" src="https://github.com/user-attachments/assets/e8088c1f-64ed-4e37-9a2c-09f606f34b6c" />

If I simply add an escape character \ before the @ symbols, ClaudeCode extension can automatically read the contents of CLAUDE.md on startup. It's a very weird bug!

<img width="818" height="267" alt="Image" src="https://github.com/user-attachments/assets/d394633c-9a2c-4008-888b-616b4103227f" />

Error Messages/Logs

2025-10-05 02:27:29.448 [info] Received message from webview: {"type":"io_message","channelId":"yjqkqdzt8r","message":{"type":"user","session_id":"","parent_tool_use_id":null,"message":{"role":"user","content":[{"type":"text","text":"1"}]}},"done":false}
2025-10-05 02:27:29.470 [info] Closing Claude on channel: yjqkqdzt8r
2025-10-05 02:27:29.470 [error] Error from Claude (on channel yjqkqdzt8r): Error: Claude Code process exited with code 1

Steps to Reproduce

1. Add a CLAUDE.md file and include the text "- @abcdefg"
2. Restart VSCode and try entering content in the chat box

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code for VS Code v2.0.5

Platform

Other

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_