diff --git a/data/scripts/o b/data/scripts/o
index 17ef3c3..a24f31a 100755
--- a/data/scripts/o
+++ b/data/scripts/o
@@ -408,8 +408,8 @@ cmd_tui() {
     tmux kill-session -t "${tmux_session}" 2>/dev/null || true
 
     # Layout: chat (top 80%), prompt (bottom 20%)
-    # Use colon separator in o commands to handle session names with slashes
-    local ctx="$s:$a"
+    # Use slash separator - session names don't contain slashes, agent names might contain colons
+    local ctx="$s/$a"
     tmux new-session -d -s "$tmux_session" -c "$HOME"
     tmux set-option -t "$tmux_session" mouse on
     tmux send-keys -t "$tmux_session" "o '$ctx' log -n 1000 | grep -v '\\[\\[\\[.*\\]\\]\\]' | grep -v '^\`\`\`'; o '$ctx' read chat" Enter