Update tools.py

tools.py

@@ -2,10 +2,11 @@ from langchain_community.retrievers import BM25Retriever
 from langchain.tools import Tool
 from langchain_community.tools import DuckDuckGoSearchRun
 from langchain_community.document_loaders.wikipedia import WikipediaLoader
-
+from langchain_core.tools import tool
 
 search_tool = DuckDuckGoSearchRun()
 
+@tool
 def wiki_loader(query: str, lang: str='en', load_max_docs: int=2):
     """
     Fetches content from Wikipedia based on a given query.