Update tools.py

tools.py

@@ -3,6 +3,13 @@ from langchain_community.tools import DuckDuckGoSearchRun
 import pandas as pd
 @tool
 def web_search(query: str) -> str:
+    """
+    Search the web for information.
+    Args:
+        query: The query to search the web for.
+    Returns:
+        The search results.
+    """
     ddg = DuckDuckGoSearchRun()
     return ddg.run(query)