[BUG] ctrl+o to expand doesn't expand Read

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 Read tool has a description that says (ctrl+o to expand), but pressing ctrl and o does not expand the text.

What Should Happen?

Either the incorrect (ctrl+o to expand) text should be removed, or it should be expanded in the transcript view.

Error Messages/Logs

n/a

Steps to Reproduce

• Tell Claude to read a file with the Read() tool
• Claude Code interface says ctrl+o will "expand" the lines
• User presses ctrl+o to toggle detailed transcript
• The lines remain collapsed.

This should be easy to reproduce. This is my exact reproduction:

> Please read my_file

● Read(my_file)
  ⎿  Read 31 lines (ctrl+o to expand)

● The file contains 30 lines with the repeated text "this content goes for 30 lines" followed by an empty line 31.

> /status

 Claude Code v1.0.123

Notice that it tells me I can see the content by pressing ctrl+o.

After pressing control and o, it goes to the detailed transcript view:

> Please read my_file

● Read(file_path: "/home/xerool/my_project/my_file")
  ⎿  Read 31 lines (ctrl+o to expand)

● The file contains 30 lines with the repeated text "this content goes for 30 lines" followed by an empty line 31.            11:20 PM  claude-sonnet-4-20250514

Notice the bug: detailed transcript didn't expand the lines. It still says (ctrl+o to expand) even though I'm already in the expanded view.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.0.123

Platform

Anthropic API

Operating System

Linux

Terminal/Shell

Other

Additional Information

_No response_