If you want the AI to "learn" something about your methods, you need to put that stuff into the context window, done. Thats basically why "You are a helpful assistant." is not enough for a prompt. You basically need to put in your coding standard, so that the machine knows what style to follow. Whenever you think it should "learn" something new about your methods, extent your system prompt. IOW, put everything you tell your intern, into the system prompt :-)