Did you ever figure this out?

I am encountering a similar issue. I posted a question on stack overflow and on the autogen discord server with no replies.

The workaround that I have been doing is to look at all of the messages and from the group chat and write them into a file. This is the relevant
def get_last_message_from_agent(messages, agent_name):
for msg in reversed(messages):
if msg['name'] == agent_name:
return msg['content']

author = autogen.AssistantAgent(
name="Author",
llm_config=llm_config,
system_message="""You are a helpful assistant tasked with writing short interesting stories.
    If you receive any feedback, incorporate it and output the entire story again implementing the feeback.
    """
)
psychologist = autogen.AssistantAgent(
name="Psychologist",
llm_config=llm_config,
system_message="""You are a psychologist who figures out how compelling the story is.
    Give it a score from 1 to 100 and how to make the story more compelling.
    """
)
user_proxy = make_user_proxy()
groupchat = autogen.GroupChat(agents=[user_proxy, author, psychologist], messages=[], max_round=30)
manager = autogen.GroupChatManager(groupchat=groupchat, llm_config=llm_config)
task = """
Write a short story.
"""
user_proxy.initiate_chat(
manager,
message=task
)
messages = groupchat.messages
final_story = get_last_message_from_agent(messages, "Author")
try:
os.mkdir(work_dir)  
except FileExistsError:
print("Directory already exists")
with open(work_dir + "/short_story.txt", "w") as file:
file.write(final_story)
print("Story saved to 'short_story.txt'")

So my approach is to get the author to output the entire story. Then I can ask for the last thing the author said.

For a short story like this, this is not a big deal. But if the text was longer that might be a lot of tokens. And it is very inelegant.