Python: Correct chat completion agent history truncation samples (microsoft#12474)

TaoChenOSU · web-flow · commit 9b8f8e22c3b8 · 2025-06-13T20:11:00.000Z
### Motivation and Context  While addressing the developer in this [discussion](microsoft#12450), I notice that there are a few changes needed to the improve the truncation history reducer samples of the chat completion agent. ### Description  Update the samples. ### Contribution Checklist  - [ ] The code builds clean without any errors or warnings - [ ] The PR follows the [SK Contribution Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md) and the [pre-submission formatting script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts) raises no violations - [ ] All unit tests pass, and I have added new tests where possible - [ ] I didn't break anyone 😄
diff --git a/python/samples/concepts/agents/chat_completion_agent/chat_completion_agent_truncate_history_reducer_agent_chat.py b/python/samples/concepts/agents/chat_completion_agent/chat_completion_agent_truncate_history_reducer_agent_chat.py
@@ -39,11 +39,11 @@ async def main():
     reducer_msg_count = 10
     reducer_threshold = 10
 
-    # Create a summarization reducer and clear its history
-    history_truncatation_reducer = ChatHistoryTruncationReducer(
+    # Create a truncation reducer and clear its history
+    history_truncation_reducer = ChatHistoryTruncationReducer(
         target_count=reducer_msg_count, threshold_count=reducer_threshold
     )
-    history_truncatation_reducer.clear()
+    history_truncation_reducer.clear()
 
     # Create our agent
     agent = ChatCompletionAgent(
@@ -53,7 +53,7 @@ async def main():
     )
 
     # Create a group chat using the reducer
-    chat = AgentGroupChat(chat_history=history_truncatation_reducer)
+    chat = AgentGroupChat(chat_history=history_truncation_reducer)
 
     # Simulate user messages
     message_count = 50  # Number of messages to simulate
@@ -65,7 +65,7 @@ async def main():
         # Attempt to reduce history
         is_reduced = await chat.reduce_history()
         if is_reduced:
-            print(f"@ History reduced to {len(history_truncatation_reducer.messages)} messages.")
+            print(f"@ History reduced to {len(history_truncation_reducer.messages)} messages.")
 
         # Invoke the agent and display responses
         async for message in chat.invoke(agent):
diff --git a/python/samples/concepts/agents/chat_completion_agent/chat_completion_agent_truncate_history_reducer_single_agent.py b/python/samples/concepts/agents/chat_completion_agent/chat_completion_agent_truncate_history_reducer_single_agent.py
@@ -28,9 +28,10 @@ async def main():
     reducer_msg_count = 10
     reducer_threshold = 10
 
-    # Create a summarization reducer
+    # Create a truncation reducer
     history_truncation_reducer = ChatHistoryTruncationReducer(
-        service=AzureChatCompletion(), target_count=reducer_msg_count, threshold_count=reducer_threshold
+        target_count=reducer_msg_count,
+        threshold_count=reducer_threshold,
     )
 
     thread: ChatHistoryAgentThread = ChatHistoryAgentThread(chat_history=history_truncation_reducer)
