Python: Fix sample and README (microsoft#11298)

### Motivation and Context

The AzureAIAgent step1 sample is using a `thread_id` kwarg for
`agent.invoke(...)`. Fix this to be `thread` instead, so we can use the
created thread for later invokes.

For the OpenAIAssistantAgent README, update the `thread` related items
to use the new common agent invoke api constructs.

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### Description

Update a sample and a README.

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### Contribution Checklist

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- [X] The code builds clean without any errors or warnings
- [X] The PR follows the [SK Contribution
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Author: moonbox3

python/samples/getting_started_with_agents/azure_ai_agent/step2_azure_ai_agent_plugin.py

@@ -5,7 +5,7 @@
 
 from azure.identity.aio import DefaultAzureCredential
 
-from semantic_kernel.agents import AzureAIAgent, AzureAIAgentSettings, AzureAIAgentThread
+from semantic_kernel.agents import AzureAIAgent, AzureAIAgentSettings
 from semantic_kernel.functions import kernel_function
 
 """
@@ -60,29 +60,26 @@ async def main() -> None:
         agent = AzureAIAgent(
             client=client,
             definition=agent_definition,
+            plugins=[MenuPlugin()],  # Add the plugin to the agent
         )
 
-        # 3. Add a plugin to the agent via the kernel
-        agent.kernel.add_plugin(MenuPlugin(), plugin_name="menu")
-
-        # 4. Create a thread for the agent
+        # 3. Create a thread for the agent
         # If no thread is provided, a new thread will be
         # created and returned with the initial response
-        thread: AzureAIAgentThread = None
+        thread = None
 
         try:
             for user_input in USER_INPUTS:
                 print(f"# User: {user_input}")
-                # 5. Invoke the agent for the specified thread for response
+                # 4. Invoke the agent for the specified thread for response
                 async for response in agent.invoke(
                     messages=user_input,
-                    thread_id=thread,
-                    temperature=0.2,  # override the agent-level temperature setting with a run-time value
+                    thread=thread,
                 ):
                     print(f"# {response.name}: {response}")
                     thread = response.thread
         finally:
-            # 6. Cleanup: Delete the thread and agent
+            # 5. Cleanup: Delete the thread and agent
             await thread.delete() if thread else None
             await client.agents.delete_agent(agent.id)
 

python/samples/getting_started_with_agents/openai_assistant/README.md

@@ -47,15 +47,19 @@ agent = OpenAIAssistantAgent(
     definition=definition,
 )
 
-# Define a thread and invoke the agent with the user input
-thread = await agent.client.beta.threads.create()
-
-# Add a message to the thread
-await agent.add_chat_message(thread_id=thread.id, message="Why is the sky blue?")
-
-# Invoke the agent
-async for content in agent.invoke(thread_id=thread.id):
-    print(f"# {content.role}: {content.content}")
+# Define a thread to hold the conversation's context
+# If a thread is not created initially it will be created
+# and returned as part of the first response
+thread = None
+
+# Get the agent response
+response = await agent.get_response(messages="Why is the sky blue?", thread=thread)
+thread = response.thread
+
+# or use the agent.invoke(...) method
+async for response in agent.invoke(messages="Why is the sky blue?", thread=thread):
+    print(f"# {response.role}: {response.content}")
+    thread = response.thread
 ```
 
 ### Semantic Kernel Azure Assistant Agents
@@ -89,13 +93,17 @@ agent = AzureAssistantAgent(
     definition=definition,
 )
 
-# Define a thread and invoke the agent with the user input
-thread = await agent.client.beta.threads.create()
+# Define a thread to hold the conversation's context
+# If a thread is not created initially it will be created
+# and returned as part of the first response
+thread = None
 
-# Add a message to the thread
-await agent.add_chat_message(thread_id=thread.id, message="Why is the sky blue?")
+# Get the agent response
+response = await agent.get_response(messages="Why is the sky blue?", thread=thread)
+thread = response.thread
 
-# Invoke the agent
-async for content in agent.invoke(thread_id=thread.id):
-    print(f"# {content.role}: {content.content}")
+# or use the agent.invoke(...) method
+async for response in agent.invoke(messages="Why is the sky blue?", thread=thread):
+    print(f"# {response.role}: {response.content}")
+    thread = response.thread
 ```