Update app.py

app.py

@@ -13,7 +13,11 @@ OMDB_API_KEY = "a08b4599"
 
 @tool
 def get_movies_by_mood(mood: str) -> str:
-    """Suggests up to 5 movies based on the user's mood using OMDb API."""
+    """Suggests up to 5 movies based on the user's mood using OMDb API.
+    
+    Args:
+        mood: a current emotional state or feeling of a user (e.g., 'sad', 'happy', 'romantic')
+    """
     mood_keywords = {
         "happy": "comedy",
         "sad": "drama",