[BUG] Interactive Command with fzf hangs indefinitely in Bash mode

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 have a custom git alias to git is to let me interactively pick a branch using fzf. When doing ! git is in Claude Code, the command is pushed to the background then hangs indefinitely. It is reproduable with echo -e "apple\nbanana\norange\nmango\nkiwi\npapaya\ndragonfrui" | fzf.

What Should Happen?

The command should actually be interactive or fail because interactive in bash isn't supported.

Error Messages/Logs

N/A

Steps to Reproduce

1. Install fzf
2. Open Claude Code
3. Enter Bash mode with !
4. Run echo -e "apple\nbanana\norange\nmango\nkiwi\npapaya\ndragonfrui" | fzf
5. Observe

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.22

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_