tmux-conf-ghostty-shift-enter

name	tmux-conf-ghostty-shift-enter
description	Fix Shift+Enter in Ghostty + tmux. TIL note about tmux. Use when working with tmux and the user mentions conf ghostty shift enter or related topics.

Fix Shift+Enter in Ghostty + tmux

Ghostty uses the kitty keyboard protocol and sends \e[13;2u for Shift+Enter. By default, tmux swallows this and sends a plain Enter to the inner application.

For the Ghostty side, see: ghostty/config-shift_enter.md.

tmux config

~/.tmux.conf

# Pass through extended keys (kitty protocol) to inner applications
set -s extended-keys always
set -as terminal-features 'xterm-ghostty*:extkeys'

• extended-keys always makes tmux unconditionally forward CSI u key sequences to applications inside it. With on (instead of always), tmux only forwards them if the inner application explicitly requests them.
• The terminal-features line tells tmux the outer Ghostty terminal supports extended keys.