class LongTermMemory(ContextProvider):
    ...

    async def invoking(
        self,
        messages: ChatMessage | MutableSequence[ChatMessage],
        **kwargs: Any
    ) -> Context:
        ...

        return Context(messages=[
            ChatMessage(role="user", text=f"{self._context_prompt}\n{line_sep_memories}")
        ] if len(line_sep_memories)>0 else None)