diff --git a/plugins/warp/scripts/legacy/on-session-start.sh b/plugins/warp/scripts/legacy/on-session-start.sh
index 4d5e7fb..e3749a3 100755
--- a/plugins/warp/scripts/legacy/on-session-start.sh
+++ b/plugins/warp/scripts/legacy/on-session-start.sh
@@ -11,10 +11,5 @@ if [ "$TERM_PROGRAM" = "WarpTerminal" ]; then
 }
 EOF
 else
-    # Not running in Warp - suggest installing
-    cat << 'EOF'
-{
-  "systemMessage": "ℹ️ Warp plugin installed but you're not running in Warp terminal. Install Warp (https://warp.dev) to get native notifications when Claude completes tasks or needs input."
-}
-EOF
+    exit 0
 fi
diff --git a/plugins/warp/tests/test-hooks.sh b/plugins/warp/tests/test-hooks.sh
index 220d3ae..c8fcbb6 100755
--- a/plugins/warp/tests/test-hooks.sh
+++ b/plugins/warp/tests/test-hooks.sh
@@ -215,13 +215,6 @@ assert_eq "legacy Warp shows active message" \
     "🔔 Warp plugin active. You'll receive native Warp notifications when tasks complete or input is needed." \
     "$SYS_MSG"
 
-# Not Warp (neither env var set)
-OUTPUT=$(TERM_PROGRAM=other bash "$HOOK_DIR/on-session-start.sh" < /dev/null 2>/dev/null)
-SYS_MSG=$(echo "$OUTPUT" | jq -r '.systemMessage // empty' 2>/dev/null)
-assert_eq "non-Warp shows install message" \
-    "ℹ️ Warp plugin installed but you're not running in Warp terminal. Install Warp (https://warp.dev) to get native notifications when Claude completes tasks or needs input." \
-    "$SYS_MSG"
-
 echo ""
 echo "--- Modern-only hooks exit silently without protocol version ---"