Update app.py

app.py

@@ -16,6 +16,9 @@ DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 # 🛠️ Custom tool
 @tool
 def get_hugging_face_top_daily_paper() -> str:
+    """
+    Returns the title of the most upvoted paper on Hugging Face daily papers.
+    """
     try:
         url = "https://huggingface.co/papers"
         response = requests.get(url)