Update app.py

app.py

@@ -5,25 +5,39 @@ import pytz
 import yaml
 from tools.final_answer import FinalAnswerTool
 from datetime import datetime, timedelta
+import json
 from Gradio_UI import GradioUI
 
+
 # Below is the new deadline calculator tool
 @tool
-def deadline_calculator(start_date: str, days: int) -> dict:
-    """A tool that calculates the deadline date based on a start date and a number of days.
+def deadline_calculator(start_date: str, days: int) -> str:
+    """
+    A tool that calculates the deadline date based on a given start date and duration in days.
+
     Args:
-        start_date: The starting date in 'YYYY-MM-DD' format.
-        days: The number of days until the deadline.
+        start_date (str): The starting date in the format 'YYYY-MM-DD'.
+        days (int): The number of days until the deadline.
+
     Returns:
-        A dictionary containing the deadline date and the day of the week.
+        str: A JSON-formatted string containing:
+            - "Deadline" (str): The calculated deadline date in 'YYYY-MM-DD' format.
+            - "Day of Week" (str): The corresponding day of the week for the deadline.
+            - "Error" (str, optional): If an invalid date format is provided, an error message is returned.
+
+    Example:
+        >>> deadline_calculator("2025-02-18", 10)
+        '{"Deadline": "2025-02-28", "Day of Week": "Friday"}'
     """
     try:
         start = datetime.strptime(start_date, "%Y-%m-%d")
         deadline = start + timedelta(days=days)
         weekday = deadline.strftime("%A")
-        return {"Deadline": deadline.strftime("%Y-%m-%d"), "Day of Week": weekday}
+        result = {"Deadline": deadline.strftime("%Y-%m-%d"), "Day of Week": weekday}
     except ValueError:
-        return {"Error": "Invalid date format. Please use 'YYYY-MM-DD'."}
+        result = {"Error": "Invalid date format. Please use 'YYYY-MM-DD'."}
+    
+    return json.dumps(result)  # Converts dictionary to a string
 
 # Example usage:
 # print(deadline_calculator("2025-02-18", 10))