[BUG]

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?

PostToolUse hooks cause terminal viewport to jump to top of scrollback when user has scrolled up to review previous output.

Reproducible with any PostToolUse hook. Statusline timer may also contribute.

What Should Happen?

If the user is in any section of the scroll bar, the PostToolUse should not move the user's position at all.

Error Messages/Logs

Steps to Reproduce

1. Submit user message
2. Scroll up the terminal session to review transcript.
3. Wait for PostToolUse to fire

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.76 (Claude Code)

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

Windows Terminal

Additional Information

_No response_