[BUG] Terminal.app freezes when opening new window while Claude Code sessions are running

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?

Max user.
Terminal.app completely freezes (unresponsive to all input, cannot open new windows) when attempting to open a new Terminal window while two Claude Code sessions are already running.
Steps to reproduce:

Open Terminal.app
Start a Claude Code session in one window
Open a second Terminal window and start another Claude Code session
Attempt to open a third Terminal window (Cmd+N)
Terminal.app freezes completely

System info:

macOS version: [paste from sw_vers]
Claude Code version: [paste from claude --version]
Terminal: Apple Terminal.app
Workaround: Using iTerm2 instead

What Should Happen?

A new Terminal window should open normally. Claude Code sessions running in other windows should not affect Terminal.app's ability to open new windows or respond to user input.

Error Messages/Logs

Steps to Reproduce

Open Terminal.app on macOS
In the first Terminal window, run claude to start a Claude Code session
Press Cmd+N to open a second Terminal window
In the second window, run claude to start another Claude Code session
Press Cmd+N to attempt to open a third Terminal window
Terminal.app freezes completely — no new window appears, and all Terminal windows become unresponsive to keyboard and mouse input

Environment:

Default macOS Terminal.app (no custom configuration)
Two active Claude Code sessions in conversation mode

Recovery required:

Open Activity Monitor
Kill node processes associated with Claude Code
Force quit Terminal.app via Cmd+Option+Esc

Workaround:

Using iTerm2 instead of Terminal.app — issue does not occur there

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

v2.1.14

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_