Improve error messaging (#3236)

* Update error language and corresponding tests

* Updated another test to use the new error message

Author: umermansoor

autogen/agentchat/conversable_agent.py

@@ -2234,7 +2234,7 @@ def execute_function(self, func_call, verbose: bool = False) -> Tuple[bool, Dict
                 arguments = json.loads(input_string)
             except json.JSONDecodeError as e:
                 arguments = None
-                content = f"Error: {e}\n You argument should follow json format."
+                content = f"Error: {e}\n The argument must be in JSON format."
 
             # Try to execute the function
             if arguments is not None:
@@ -2291,7 +2291,7 @@ async def a_execute_function(self, func_call):
                 arguments = json.loads(input_string)
             except json.JSONDecodeError as e:
                 arguments = None
-                content = f"Error: {e}\n You argument should follow json format."
+                content = f"Error: {e}\n The argument must be in JSON format."
 
             # Try to execute the function
             if arguments is not None:

test/agentchat/test_function_and_tool_calling.py

@@ -94,11 +94,11 @@ async def _a_tool_func_error(arg1: str, arg2: str) -> str:
         {
             "tool_call_id": "1",
             "role": "tool",
-            "content": "Error: Expecting property name enclosed in double quotes: line 1 column 37 (char 36)\n You argument should follow json format.",
+            "content": "Error: Expecting property name enclosed in double quotes: line 1 column 37 (char 36)\n The argument must be in JSON format.",
         },
         {"tool_call_id": "2", "role": "tool", "content": "_tool_func_2: value3 value4"},
     ],
-    "content": "Error: Expecting property name enclosed in double quotes: line 1 column 37 (char 36)\n You argument should follow json format.\n\n_tool_func_2: value3 value4",
+    "content": "Error: Expecting property name enclosed in double quotes: line 1 column 37 (char 36)\n The argument must be in JSON format.\n\n_tool_func_2: value3 value4",
 }
 
 _tool_use_message_1_error_expected_reply = {
@@ -154,7 +154,7 @@ async def _a_tool_func_error(arg1: str, arg2: str) -> str:
 _function_use_message_1_bad_json_expected_reply = {
     "name": "_tool_func_1",
     "role": "function",
-    "content": "Error: Expecting property name enclosed in double quotes: line 1 column 37 (char 36)\n You argument should follow json format.",
+    "content": "Error: Expecting property name enclosed in double quotes: line 1 column 37 (char 36)\n The argument must be in JSON format.",
 }
 
 _function_use_message_1_error_expected_reply = {

test/agentchat/test_function_call.py

@@ -115,7 +115,7 @@ def add_num(num_to_be_added):
         "name": "add_num",
         "arguments": '{ "num_to_be_added": 5, given_num: 10 }',
     }  # should be "given_num" with quotes
-    assert "You argument should follow json format." in user.execute_function(func_call=wrong_json_format)[1]["content"]
+    assert "The argument must be in JSON format." in user.execute_function(func_call=wrong_json_format)[1]["content"]
 
     # function execution error with wrong arguments passed
     wrong_args = {"name": "add_num", "arguments": '{ "num_to_be_added": 5, "given_num": 10 }'}
@@ -174,7 +174,7 @@ async def add_num(num_to_be_added):
         "arguments": '{ "num_to_be_added": 5, given_num: 10 }',
     }  # should be "given_num" with quotes
     assert (
-        "You argument should follow json format."
+        "The argument must be in JSON format."
         in (await user.a_execute_function(func_call=wrong_json_format))[1]["content"]
     )