diff --git a/libraries/python/guided-conversation/guided_conversation/functions/execution.py b/libraries/python/guided-conversation/guided_conversation/functions/execution.py
index 7273e362..549c777c 100644
--- a/libraries/python/guided-conversation/guided_conversation/functions/execution.py
+++ b/libraries/python/guided-conversation/guided_conversation/functions/execution.py
@@ -3,7 +3,7 @@
 from semantic_kernel import Kernel
 from semantic_kernel.connectors.ai.function_choice_behavior import FunctionChoiceBehavior
 from semantic_kernel.connectors.ai.prompt_execution_settings import PromptExecutionSettings
-from semantic_kernel.functions import FunctionResult, KernelArguments, KernelPlugin
+from semantic_kernel.functions import FunctionResult, KernelArguments, KernelFunction
 from semantic_kernel.functions.kernel_function_decorator import kernel_function
 
 execution_template = """<message role="system">You are a helpful, thoughtful, and meticulous assistant.
@@ -44,14 +44,14 @@ def end_conversation() -> None:
 
 
 async def execution(
-    kernel: Kernel, reasoning: str, filter: list[str], req_settings: PromptExecutionSettings, artifact_schema: str
+    kernel: Kernel, reasoning: str, functions: list[str], req_settings: PromptExecutionSettings, artifact_schema: str
 ) -> FunctionResult:
     """Executes the actions recommended by the reasoning/planning call in the given context.
 
     Args:
         kernel (Kernel): The kernel object.
         reasoning (str): The reasoning from a previous model call.
-        filter (list[str]): The list of plugins to INCLUDE for the tool call.
+        functions (list[str]): The list of plugins to INCLUDE for the tool call.
         req_settings (PromptExecutionSettings): The prompt execution settings.
         artifact (str): The artifact schema for the execution prompt.
 
@@ -59,7 +59,7 @@ async def execution(
         FunctionResult: The result of the execution.
     """
     req_settings.function_choice_behavior = FunctionChoiceBehavior.Auto(
-        auto_invoke=False, filters={"included_plugins": filter}
+        auto_invoke=False, filters={"included_plugins": functions}
     )
 
     kernel_function = kernel.add_function(
@@ -69,7 +69,7 @@ async def execution(
         template_format="jinja2",
         prompt_execution_settings=req_settings,
     )
-    if isinstance(kernel_function, KernelPlugin):
+    if not isinstance(kernel_function, KernelFunction):
         raise ValueError("Invalid kernel function type.")
 
     arguments = KernelArguments(
diff --git a/libraries/python/guided-conversation/guided_conversation/guided_conversation_agent.py b/libraries/python/guided-conversation/guided_conversation/guided_conversation_agent.py
index d02776e3..1ed37e3a 100644
--- a/libraries/python/guided-conversation/guided_conversation/guided_conversation_agent.py
+++ b/libraries/python/guided-conversation/guided_conversation/guided_conversation_agent.py
@@ -263,7 +263,7 @@ async def execute_plan(
         result = await execution(
             kernel=self.kernel,
             reasoning=plan,
-            filter=functions,
+            functions=functions,
             req_settings=req_settings,
             artifact_schema=self.artifact.get_schema_for_prompt(),
         )
@@ -318,7 +318,7 @@ async def final_update(self):
         execution_response = await execution(
             kernel=self.kernel,
             reasoning=reasoning_response.value[0].content,
-            filter=functions,
+            functions=functions,
             req_settings=req_settings,
             artifact_schema=self.artifact.get_schema_for_prompt(),
         )
diff --git a/libraries/python/guided-conversation/guided_conversation/utils/openai_tool_calling.py b/libraries/python/guided-conversation/guided_conversation/utils/openai_tool_calling.py
index 2b32d8b4..1e567896 100644
--- a/libraries/python/guided-conversation/guided_conversation/utils/openai_tool_calling.py
+++ b/libraries/python/guided-conversation/guided_conversation/utils/openai_tool_calling.py
@@ -32,6 +32,7 @@ class ToolValidationResult(Enum):
     INVALID_TOOL_CALLED = "A tool was called with an unexpected name"
     MISSING_REQUIRED_ARGUMENT = "The tool called is missing a required argument"
     INVALID_ARGUMENT_TYPE = "The value of an argument is of an unexpected type"
+    INVALID_ARGUMENT = "The tool called has an unexpected argument"
     SUCCESS = "success"
 
 
@@ -158,4 +159,9 @@ def validate_tool_calling(response: dict[str, Any], request_tool_param: dict) ->
                 logger.warning(f"Missing required argument '{arg.argument_name}' for tool '{tool_name}'.")
                 return ToolValidationResult.MISSING_REQUIRED_ARGUMENT
 
+        for tool_arg_name in tool_args.keys():
+            if tool_arg_name not in [arg.argument_name for arg in tool.args]:
+                logger.warning(f"Unexpected argument '{tool_arg_name}' for tool '{tool_name}'.")
+                return ToolValidationResult.INVALID_ARGUMENT
+
     return ToolValidationResult.SUCCESS