[BUG] VSCode Claude `Task` input appears in input box history

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?

I noticed when using the up arrow key to access a previous prompt that it included a Claude generated Task input message. I figure this is a bug, but apologies for the noise if it is not.

<img width="2463" height="436" alt="Image" src="https://github.com/user-attachments/assets/da6319fd-ead2-4457-a807-7cd6310047cd" />

What Should Happen?

I would expect the user input box history to be scoped to user input messages since.

Error Messages/Logs

Steps to Reproduce

1. Prompt Claude in VsCode (I used sidebar integration), until it uses a Task
2. Use the up/down arrow key to scroll through the input history and look for the Task input.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.39

Platform

Google Vertex AI

Operating System

macOS

Terminal/Shell

Other

Additional Information

I use the sidebar instead of the panel (default option).