Python: follow on work on OpenAI (#169)

* updated openai, fcc works, with sample

* reduced files in openai

python/packages/main/tests/unit/test_tool.py

@@ -1,6 +1,6 @@
 # Copyright (c) Microsoft. All rights reserved.
 
-from agent_framework import AITool, ai_function
+from agent_framework import AIFunction, AITool, ai_function
 
 
 def test_ai_function_decorator():
@@ -12,6 +12,7 @@ def test_ai_function_decorator():
         return x + y
 
     assert isinstance(test_tool, AITool)
+    assert isinstance(test_tool, AIFunction)
     assert test_tool.name == "test_tool"
     assert test_tool.description == "A test tool"
     assert test_tool.parameters() == {
@@ -23,6 +24,27 @@ def test_ai_function_decorator():
     assert test_tool(1, 2) == 3
 
 
+def test_ai_function_decorator_without_args():
+    """Test the ai_function decorator."""
+
+    @ai_function
+    def test_tool(x: int, y: int) -> int:
+        """A simple function that adds two numbers."""
+        return x + y
+
+    assert isinstance(test_tool, AITool)
+    assert isinstance(test_tool, AIFunction)
+    assert test_tool.name == "test_tool"
+    assert test_tool.description == "A simple function that adds two numbers."
+    assert test_tool.parameters() == {
+        "properties": {"x": {"title": "X", "type": "integer"}, "y": {"title": "Y", "type": "integer"}},
+        "required": ["x", "y"],
+        "title": "test_tool_input",
+        "type": "object",
+    }
+    assert test_tool(1, 2) == 3
+
+
 async def test_ai_function_decorator_with_async():
     """Test the ai_function decorator with an async function."""
 
@@ -32,6 +54,7 @@ async def test_ai_function_decorator_with_async():
         return x + y
 
     assert isinstance(async_test_tool, AITool)
+    assert isinstance(async_test_tool, AIFunction)
     assert async_test_tool.name == "async_test_tool"
     assert async_test_tool.description == "An async test tool"
     assert async_test_tool.parameters() == {