Python: ChatCompletionAgent - Messages not added to ChatHistory on ChatHistoryAgentThread when history has no messages

[vslepakov]

Hi,

I noticed some unexpected behavior today. Using the following code:

...
thread = ChatHistoryAgentThread = ChatHistoryAgentThread(chat_history=history)
result = await self._agent.get_response(
        messages=chat_messages,
        thread=thread
    )
...

After the get_response method completes, the ChatHistory (history) contains no messages.
However, if I add a dummy message to the history before initializing ChatHistoryAgentThread, like this:

history.add_developer_message("EMPTY_HISTORY_FIX")

then the messages are correctly added after get_response finishes. Is this expected behavior, or could it be a limitation or bug?

Thanks

[moonbox3]

I'll look into this. However, we're moving away from wanting devs to directly access the chat history as part of the thread. Can you try to call thread.get_messages(...) (returns an async gen).

[vslepakov]

Hi @moonbox3, thanks a bunch!

the ChatHistory in my case is the ChatHistoryInCosmosDB as in this sample as we need to persist the history in CosmosDB.

Is this approach fine or should I not pass the ChatHistory object to the ChatHistoryAgentThread as depicted above and populate it after get_response completes by iterating over thread.get_messages(...)?

Right now passing the ChatHistory to the thread seems convenient as the thread first of all has the history AND adds new messages to it automatically (with the limitation described above).

[moonbox3]

That should be fine - we do want people to be able to pass in an existing ChatHistory object to the thread. Let me look into see what's going o.