claude-code - 💡(How to fix) Fix [BUG] Claude code not expand inside tmux session [3 comments, 3 participants]

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anthropics/claude-code#53320Fetched 2026-04-26 05:18:45
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Error Message

Error Messages/Logs

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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Hi, I am trying to launch claude code inside a tmux session, but the CC panel is smaller than the tmux size. Can you help with this? Thank you!

<img width="2540" height="1336" alt="Image" src="https://github.com/user-attachments/assets/e204133d-d615-452c-b298-6d8700b1bb98" />

What Should Happen?

CC should fit inside tmux session

Error Messages/Logs

Steps to Reproduce

creating tmux session -> run claude code

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

No response

Claude Code Version

2.1.119

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

No response

extent analysis

TL;DR

The issue can likely be resolved by adjusting the layout or configuration of the tmux session to accommodate the Claude Code panel.

Guidance

  • Verify that the tmux session is configured to resize panels dynamically, which might help the CC panel adjust to the available space.
  • Check if there are any specific settings in Claude Code or tmux that control the size of the CC panel, such as a configuration file or command-line option.
  • Consider using a different layout in tmux that prioritizes the CC panel's size, such as a horizontal or vertical split.
  • Test running Claude Code outside of tmux to see if the issue is specific to the tmux environment.

Notes

The provided information does not include error messages or logs, which might be helpful in diagnosing the issue. Additionally, the problem may be related to the specific version of Claude Code or tmux being used.

Recommendation

Apply workaround: Adjust the tmux session layout to accommodate the CC panel, as the issue does not seem to be a regression and there is no clear indication of a version-specific fix.

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