add warning if duplicate function is registered

autogen/agentchat/conversable_agent.py

@@ -2312,6 +2312,8 @@ def register_function(self, function_map: Dict[str, Union[Callable, None]]):
             self._assert_valid_name(name)
             if func is None and name not in self._function_map.keys():
                 warnings.warn(f"The function {name} to remove doesn't exist", name)
+            if name in self._function_map.keys():
+                warnings.warn(f"Function '{name}' is being overridden.", UserWarning)
         self._function_map.update(function_map)
         self._function_map = {k: v for k, v in self._function_map.items() if v is not None}
 
@@ -2348,6 +2350,9 @@ def update_function_signature(self, func_sig: Union[str, Dict], is_remove: None)
 
             self._assert_valid_name(func_sig["name"])
             if "functions" in self.llm_config.keys():
+                if any(func["name"] == func_sig["name"] for func in self.llm_config["functions"]):
+                    warnings.warn(f"Function '{func_sig['name']}' is being overridden.", UserWarning)
+
                 self.llm_config["functions"] = [
                     func for func in self.llm_config["functions"] if func.get("name") != func_sig["name"]
                 ] + [func_sig]
@@ -2387,6 +2392,8 @@ def update_tool_signature(self, tool_sig: Union[str, Dict], is_remove: None):
                     f"The tool signature must be of the type dict. Received tool signature type {type(tool_sig)}"
                 )
             self._assert_valid_name(tool_sig["function"]["name"])
+            if any(tool["function"]["name"] == tool_sig["function"]["name"] for tool in self.llm_config["tools"]):
+                warnings.warn(f"Function '{tool_sig['function']['name']}' is being overridden.", UserWarning)
             if "tools" in self.llm_config.keys():
                 self.llm_config["tools"] = [
                     tool