How to add conversation additional history to ConversationChain?

[TysBradford]

I'm using a ConversationChain to have a discussion with my bot. In some parts of my application I want to go "off-chain" and perform some operations (i.e fetch some results from an API).

I'm having trouble seeing how I can then add any off-chain information back into the conversation history. This info would be either a SystemMessage or a AIMessage. I was expecting I could easily just append this info somewhere but it's not obvious how. Am I missing something simple?

[oddrationale]

I think you might be looking for something like this:
How to add SharedMemory to an Agent and its Tools.

[TysBradford]

I figured it out.
First you'll need a reference to the memory used in the chain. This can be set on initialisation.

memory = ConversationBufferMemory(return_messages=True)
chat = ChatOpenAI(temperature=0.2
conversation = ConversationChain(
    llm=chat,
    memory=memory,
    verbose=False,
    prompt=prompt
)

Then
memory.chat_memory.add_ai_message(message)

[abaybektursun]

  super().__init__(**kwargs)
File "pydantic/main.py", line 339, in pydantic.main.BaseModel.__init__
File "pydantic/main.py", line 1102, in pydantic.main.validate_model
File "/Users/abaybektursun/projects/IdeaMachine/ds_agents/venv/lib/python3.10/site-packages/langchain/chains/conversation/base.py", line 52, in validate_prompt_input_variables
  prompt_variables = values["prompt"].input_variables
KeyError: 'prompt'