Update app.py

app.py

@@ -32,11 +32,11 @@ def today_tool(text: str) -> str:
        This function always returns today's date."""
     return str(date.today())
 
-def yfinance_download_tool(tickers: str[], start: date, end: date) -> str:
-    """Returns stock data for given tickers from a start date to an end date. 
+def yfinance_download_tool(tickers: List[str], start: date, end: date) -> DataFrame:
+    """Returns stock data for given tickers from a start date to an end date using yfinance download. 
        Use this function for any questions related to getting stock data. 
-       The input should be a string array of tickers, a start date, and an end date. 
-       This function always returns yf.download."""
+       The input should be the tickers as a list of strings, a start date, and an end date. 
+       This function always returns a Pandas DataFrame."""
     return yf.download(tickers, start=start_date, end=end_date)
 
 tools = {