Update app.py

app.py

@@ -33,6 +33,34 @@ def get_current_time_in_timezone(timezone: str) -> str:
     except Exception as e:
         return f"Error fetching time for timezone '{timezone}': {str(e)}"
 
+@tool
+def unit_converter(value: float, from_unit: str, to_unit: str) -> str:
+    """通用单位转换工具（支持长度、重量、温度）
+    Args:
+        value: 要转换的数值
+        from_unit: 原单位（支持：m, km, kg, g, °C, °F等）
+        to_unit: 目标单位
+    """
+    try:
+        # 长度转换
+        if {from_unit, to_unit} <= {"m", "km"}:
+            factor = 0.001 if from_unit == "m" else 1000
+            return f"{value}{from_unit} = {value*factor}{to_unit}"
+        
+        # 重量转换
+        if {from_unit, to_unit} <= {"kg", "g"}:
+            factor = 1000 if from_unit == "kg" else 0.001
+            return f"{value}{from_unit} = {value*factor}{to_unit}"
+        
+        # 温度转换
+        if from_unit == "°C" and to_unit == "°F":
+            return f"{value}°C = {value*9/5+32}°F"
+        if from_unit == "°F" and to_unit == "°C":
+            return f"{value}°F = {(value-32)*5/9}°C"
+            
+        return "暂不支持该单位转换"
+    except Exception as e:
+        return f"单位转换失败：{str(e)}"
 
 final_answer = FinalAnswerTool()