Update app.py

app.py

@@ -18,7 +18,7 @@ api_key = os.getenv("ALPHAVANTAGE")
 # Define a tool to retrieve the Discounted Cash Flow (DCF) of a company
 
 @tool
-def get_dcf_of_company(api_key: str, company_name: str) -> str:
+def get_dcf_of_company(api_key=api_key: str, company_name: str) -> str:
     """A tool that retrieves the DCF of a company based on its name.
     Args:
         api_key: The API key for accessing Alpha Vantage.