Python: [BREAKING] changed AIFunction to FunctionTool and @ai_function to @tool (#3413)

* changed AIFunction to FunctionTool and @ai_function to @tool

* test and mypy fixes

* mypy fix

* switch function tool to always_require

* fix noop

* fix github copilot imports

* test fixes

* fix ollama test

* fixes for tests

* fix tests

* reverted change to always_require and extended timeout

* fix test

python/packages/core/tests/azure/test_azure_assistants_client.py

@@ -18,6 +18,7 @@ from agent_framework import (
     ChatResponse,
     ChatResponseUpdate,
     HostedCodeInterpreterTool,
+    tool,
 )
 from agent_framework.azure import AzureOpenAIAssistantsClient
 from agent_framework.exceptions import ServiceInitializationError
@@ -253,6 +254,7 @@ def test_azure_assistants_client_serialize(azure_openai_unit_test_env: dict[str,
     assert "User-Agent" not in dumped_settings["default_headers"]
 
 
+@tool(approval_mode="never_require")
 def get_weather(
     location: Annotated[str, Field(description="The location to get the weather for.")],
 ) -> str:

python/packages/core/tests/azure/test_azure_chat_client.py

@@ -25,7 +25,7 @@ from agent_framework import (
     ChatMessage,
     ChatResponse,
     ChatResponseUpdate,
-    ai_function,
+    tool,
 )
 from agent_framework._telemetry import USER_AGENT_KEY
 from agent_framework.azure import AzureOpenAIChatClient
@@ -631,7 +631,7 @@ async def test_streaming_with_none_delta(
     assert any(msg.contents for msg in results)
 
 
-@ai_function
+@tool(approval_mode="never_require")
 def get_story_text() -> str:
     """Returns a story about Emily and David."""
     return (
@@ -642,7 +642,7 @@ def get_story_text() -> str:
     )
 
 
-@ai_function
+@tool(approval_mode="never_require")
 def get_weather(location: str) -> str:
     """Get the current weather for a location."""
     return f"The weather in {location} is sunny and 72°F."

python/packages/core/tests/azure/test_azure_responses_client.py

@@ -20,7 +20,7 @@ from agent_framework import (
     HostedFileSearchTool,
     HostedMCPTool,
     HostedWebSearchTool,
-    ai_function,
+    tool,
 )
 from agent_framework.azure import AzureOpenAIResponsesClient
 from agent_framework.exceptions import ServiceInitializationError
@@ -41,7 +41,7 @@ class OutputStruct(BaseModel):
     weather: str
 
 
-@ai_function
+@tool(approval_mode="never_require")
 async def get_weather(location: Annotated[str, "The location as a city name"]) -> str:
     """Get the current weather in a given location."""
     # Implementation of the tool to get weather