Fill starter prompt with data

[gururise]

I am writing a tech support chatbot. The problem is the user can engage the chatbot after the user has had a long conversation with a tech support agent. When the chatbot is first engaged, I want to pre-fill its memory or system prompt with a summary of the conversation up to the point where the chatbot was engaged by the user.

Is this even possible? I know I can create a custom tool that would be able to summarize the thread, but I just need the summary of the thread to be generated when the chatbot is first called by the user. Could I use variables? Its not clear if each chatId will get its own instance of the variables, or if the variables are global and shared by all chatIds?