diff --git a/dot_claude/settings.json b/dot_claude/settings.json
index 7b4ad55..d9b4392 100644
--- a/dot_claude/settings.json
+++ b/dot_claude/settings.json
@@ -17,6 +17,15 @@
     "command": "~/.claude/statusline.sh",
     "padding": 1
   },
+  "hooks": {
+    "Notification": [
+      {
+        "hooks": [
+          { "type": "command", "command": "afplay /System/Library/Sounds/Glass.aiff" }
+        ]
+      }
+    ]
+  },
   "permissions": {
     "allow": [
       "Bash(awk:*)",
diff --git a/dot_config/tmux/tmux.conf.tmpl b/dot_config/tmux/tmux.conf.tmpl
index 42f3b9c..8eb6199 100644
--- a/dot_config/tmux/tmux.conf.tmpl
+++ b/dot_config/tmux/tmux.conf.tmpl
@@ -50,6 +50,13 @@ set -sa terminal-overrides ",xterm*:Tc"
 #set -ag terminal-overrides ',*:Setulc=\E[58::2::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'  # colored underscores
 #set -ag terminal-overrides ",alacritty:RGB"
 
+# Claude Code: pass through OSC sequences (notifications, progress bar) and
+# distinguish Shift+Enter from plain Enter so newline insertion works.
+# https://code.claude.com/docs/en/terminal-config#configure-tmux
+set -g allow-passthrough on
+set -s extended-keys on
+set -as terminal-features 'xterm*:extkeys'
+
 # index from 1 instead of 0
 set -g base-index 1
 setw -g pane-base-index 1