Update app.py

app.py

@@ -41,14 +41,33 @@ def safe_calc(expr: str):
 
 @tool
 def calculator(expr: str) -> str:
+    """
+    Safely evaluate a mathematical expression.
+
+    Args:
+        expr (str): A string containing a math expression like "2 + 2 * 3".
+
+    Returns:
+        str: JSON string with {"expression": expr, "result": value} or {"error": "..."} on failure.
+    """
     try:
         val = safe_calc(expr)
         return json.dumps({"expression": expr, "result": float(val)})
     except Exception as e:
         return json.dumps({"error": f"Calc error: {e}"})
 
+
 @tool
 def get_current_time_in_timezone(timezone: str) -> str:
+    """
+    Get the current local time in a specified timezone.
+
+    Args:
+        timezone (str): A valid timezone string (e.g., "Europe/Paris").
+
+    Returns:
+        str: JSON string with {"timezone": timezone, "local_time": "..."} or {"error": "..."} on failure.
+    """
     try:
         tz = pytz.timezone(timezone)
         local_time = datetime.datetime.now(tz).strftime("%Y-%m-%d %H:%M:%S")
@@ -56,6 +75,7 @@ def get_current_time_in_timezone(timezone: str) -> str:
     except Exception as e:
         return json.dumps({"error": f"Timezone error: {e}"})
 
+
 # -------------------------
 # Load prompts.yaml if exists
 # -------------------------
@@ -72,7 +92,7 @@ except Exception:
 MODEL_ID = 'Qwen/Qwen2.5-Coder-32B-Instruct'
 
 code_agent = CodeAgent(
-    model=MODEL_ID,  # directly pass string
+    model=MODEL_ID,
     tools=[calculator, get_current_time_in_timezone],
     max_steps=6,
     verbosity_level=0,