Python: Exclude conversation_id from chat completions API options (#4517)

* Python: Exclude conversation_id from chat completions options (#4315)

When a session with service_session_id is passed to an agent using the
Chat Completions client, conversation_id leaked through _prepare_options()
into AsyncCompletions.create(), causing an 'unexpected keyword argument'
error. The Responses client already excluded conversation_id but the Chat
Completions client did not.

Added conversation_id to the exclusion set in _prepare_options().

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Apply pre-commit auto-fixes

* Remove reproduction report artifact

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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

@@ -626,6 +626,73 @@ async def test_streaming_with_none_delta(
     assert any(msg.contents for msg in results)
 
 
+@patch.object(AsyncChatCompletions, "create", new_callable=AsyncMock)
+async def test_cmc_with_conversation_id(
+    mock_create: AsyncMock,
+    azure_openai_unit_test_env: dict[str, str],
+    chat_history: list[Message],
+    mock_chat_completion_response: ChatCompletion,
+) -> None:
+    """Test that conversation_id is excluded from the completions create call."""
+    mock_create.return_value = mock_chat_completion_response
+    chat_history.append(Message(text="hello world", role="user"))
+
+    azure_chat_client = AzureOpenAIChatClient()
+    await azure_chat_client.get_response(
+        messages=chat_history,
+        options={"conversation_id": "12345"},
+    )
+
+    call_kwargs = mock_create.call_args.kwargs
+    assert "conversation_id" not in call_kwargs
+
+
+@patch.object(AsyncChatCompletions, "create", new_callable=AsyncMock)
+async def test_cmc_streaming_with_conversation_id(
+    mock_create: AsyncMock,
+    azure_openai_unit_test_env: dict[str, str],
+    chat_history: list[Message],
+    mock_streaming_chat_completion_response: AsyncStream[ChatCompletionChunk],
+) -> None:
+    """Test that conversation_id is excluded from the streaming completions create call."""
+    mock_create.return_value = mock_streaming_chat_completion_response
+    chat_history.append(Message(text="hello world", role="user"))
+
+    azure_chat_client = AzureOpenAIChatClient()
+    async for _ in azure_chat_client.get_response(
+        messages=chat_history,
+        options={"conversation_id": "12345"},
+        stream=True,
+    ):
+        pass
+
+    call_kwargs = mock_create.call_args.kwargs
+    assert "conversation_id" not in call_kwargs
+
+
+@patch.object(AsyncChatCompletions, "create", new_callable=AsyncMock)
+async def test_cmc_agent_with_service_session_id(
+    mock_create: AsyncMock,
+    azure_openai_unit_test_env: dict[str, str],
+    mock_chat_completion_response: ChatCompletion,
+) -> None:
+    """Test that agent.run() with a session containing service_session_id works correctly."""
+    mock_create.return_value = mock_chat_completion_response
+
+    azure_chat_client = AzureOpenAIChatClient()
+    agent = azure_chat_client.as_agent(
+        name="TestAgent",
+        instructions="You are a helpful assistant.",
+    )
+
+    session = agent.get_session(service_session_id="12345")
+    response = await agent.run("hello", session=session)
+
+    assert response is not None
+    call_kwargs = mock_create.call_args.kwargs
+    assert "conversation_id" not in call_kwargs
+
+
 @tool(approval_mode="never_require")
 def get_story_text() -> str:
     """Returns a story about Emily and David."""