[BUG] Claude is constantly outputting escape sequences to my input line in the terminal.

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?

While Claude is running in the terminal it is constantly outputting [28~ repeatedly on the line for me to type on. This is happening in Powershell, Command Prompt, Bash in and out of Windows Terminal. This is happening while claude is running whether it is executing a task or sitting idle and it also happens as you can see in the screenshot while I am in the middle of typing something. I am constantly having to backspace to remove the escape sequence. If left to sit idle for a period of time, I will return to the terminal window and find a line of [28~[28~[28~ over and over. Also important- this only happens in the terminal when claude is running. If the terminal is open just sitting this is not occurring

<img width="1278" height="667" alt="Image" src="https://github.com/user-attachments/assets/ab47bc35-a49a-409d-b111-3ff27291e3b5" />

What Should Happen?

The input line should remain free of output from the agent.

Error Messages/Logs

Steps to Reproduce

Open a terminal window in Windows 11 enterprise ed.
type claude
wait
This is repeatable on my machine every session.

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.23

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

I selected windows terminal but I was also able to reproduce this issue in gitbash outside of Windows Terminal because I suspected maybe it was an issue with W.T. It is not.