Claude Code agent teams support two display modes:
- In-process: all teammates run inside the main terminal (default)
- Split panes: each teammate gets its own pane — requires tmux or iTerm2
Ghostty has native split pane support but until 1.3 had no programmatic way to create them. With the 1.3 release, AppleScript is now supported, which should allow Ghostty to be used for split pane mode without tmux.