diff --git a/tmux/tmux.conf b/tmux/tmux.conf
index 0662e00..0e46b7a 100644
--- a/tmux/tmux.conf
+++ b/tmux/tmux.conf
@@ -30,7 +30,7 @@ set-option -sa terminal-overrides ',st-256color:RGB'
 set -g renumber-windows on
 # set-window-option -g aggressive-resize on
 set-window-option -g xterm-keys on
-set-option -g focus-events
+set-option -g focus-events on
 set-option -sa terminal-overrides ',foot:RGB'
 
 # foot
@@ -183,3 +183,28 @@ set-window-option -g window-status-format "#[fg=$COL_BG_DARK,bg=$COL_BG_VERY_DAR
 set -g pane-active-border-style bg=default,fg=color240
 set -g pane-border-style fg=color240
 
+
+# ---------------------------------------------------------------------------
+# Claude Code / modern TUI support
+# ---------------------------------------------------------------------------
+# CSI-u extended keys: lets Shift+Enter, Ctrl+Enter, Alt+Enter reach the app
+# (Claude Code uses these for multiline input) instead of collapsing to CR.
+set -s extended-keys on
+set -as terminal-features 'xterm*:extkeys'
+set -as terminal-features 'foot*:extkeys'
+set -as terminal-features 'tmux-256color:extkeys'
+
+# Let inner apps talk directly to the outer terminal: inline image protocols
+# (Kitty/iTerm graphics), OSC 8 hyperlinks, OSC 777 notifications.
+set -g allow-passthrough on
+
+# OSC 52: allow tmux itself to push copies to the system clipboard, not only
+# forward sequences the app emits.
+set -s set-clipboard on
+
+# Hyperlink + notification passthrough for the terminals in use here.
+set -as terminal-features 'foot*:hyperlinks'
+set -as terminal-features 'xterm*:hyperlinks'
+
+# Bigger scrollback for long agent sessions.
+set -g history-limit 200000