added logic to compare start date to today's date

app.py

@@ -1,5 +1,5 @@
 from smolagents import CodeAgent,DuckDuckGoSearchTool, HfApiModel,load_tool,tool
-import datetime
+from datetime import datetime, date
 import requests
 import pandas as pd
 import pytz
@@ -27,8 +27,14 @@ def fetch_historical_price_data(symbol: str, start_date: str) -> list[dict]:
     if not FMP_KEY:
         return [{"error": "Missing FMP_KEY environment variable"}]
 
-    #Get today's date to validate start_date input
-    today = datetime.now()
+    today = datetime.now().date()
+    try:
+        start_dt = datetime.strptime(start_date, "%Y-%m-%d").date()
+    except ValueError:
+        return [{"error": "Invalid date format. Use 'YYYY-MM-DD'."}]
+
+    if start_dt > today:
+        return [{"error": f"The start date '{start_date}' is in the future (after today {today})."}]
 
     url = f"https://financialmodelingprep.com/stable/historical-price-eod/non-split-adjusted?symbol={symbol}&from={start_date}&apikey={FMP_API_KEY}"