[BUG] The /btw subagent seems not to work as it should be

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?

The /btw doesnt work as expected

What Should Happen?

it should split the chat window and make possible to write side question which doesnt interfere the main chat

Error Messages/Logs

Steps to Reproduce

type /btw

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.263 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

that's the way how it looks like on the vscode

<img width="869" height="350" alt="Image" src="https://github.com/user-attachments/assets/8d564615-b219-4631-a76c-8494df7e383c" />