Python: [BREAKING] added SerializationMixin and applied to contents, agents, chat client… (#1012)

* added SerializationMixin and applied to contents, agents, chat clients, removed AFBaseModel

* fix annotations type

* mypy fixes

* fix tests

* fix serializable subvalues and added large docstring

* updated indents in code block

* fixed exported urls

python/samples/getting_started/agents/openai/openai_assistants_with_explicit_settings.py

@@ -21,7 +21,7 @@ async def main() -> None:
     print("=== OpenAI Assistants Client with Explicit Settings ===")
 
     async with OpenAIAssistantsClient(
-        ai_model_id=os.environ["OPENAI_CHAT_MODEL_ID"],
+        model_id=os.environ["OPENAI_CHAT_MODEL_ID"],
         api_key=os.environ["OPENAI_API_KEY"],
     ).create_agent(
         instructions="You are a helpful weather agent.",

python/samples/getting_started/agents/openai/openai_chat_client_with_explicit_settings.py

@@ -21,7 +21,7 @@ async def main() -> None:
     print("=== OpenAI Chat Client with Explicit Settings ===")
 
     agent = OpenAIChatClient(
-        ai_model_id=os.environ["OPENAI_CHAT_MODEL_ID"],
+        model_id=os.environ["OPENAI_CHAT_MODEL_ID"],
         api_key=os.environ["OPENAI_API_KEY"],
     ).create_agent(
         instructions="You are a helpful weather agent.",

python/samples/getting_started/agents/openai/openai_chat_client_with_web_search.py

@@ -7,7 +7,7 @@ from agent_framework.openai import OpenAIChatClient
 
 
 async def main() -> None:
-    client = OpenAIChatClient(ai_model_id="gpt-4o-search-preview")
+    client = OpenAIChatClient(model_id="gpt-4o-search-preview")
 
     message = "What is the current weather? Do not ask for my current location."
     # Test that the client will use the web search tool with location

python/samples/getting_started/agents/openai/openai_responses_client_reasoning.py

@@ -10,7 +10,7 @@ async def reasoning_example() -> None:
     """Example of reasoning response (get results as they are generated)."""
     print("=== Reasoning Example ===")
 
-    agent = OpenAIResponsesClient(ai_model_id="gpt-5").create_agent(
+    agent = OpenAIResponsesClient(model_id="gpt-5").create_agent(
         name="MathHelper",
         instructions="You are a personal math tutor. When asked a math question, "
         "write and run code using the python tool to answer the question.",

python/samples/getting_started/agents/openai/openai_responses_client_with_explicit_settings.py

@@ -21,7 +21,7 @@ async def main() -> None:
     print("=== OpenAI Responses Client with Explicit Settings ===")
 
     agent = OpenAIResponsesClient(
-        ai_model_id=os.environ["OPENAI_RESPONSES_MODEL_ID"],
+        model_id=os.environ["OPENAI_RESPONSES_MODEL_ID"],
         api_key=os.environ["OPENAI_API_KEY"],
     ).create_agent(
         instructions="You are a helpful weather agent.",