Let me clarify..... When you say prompt you are probably thinking something very long. I am saying give it simple instructions to run the time every time a call starts and that is all you have to do. I am guessing you already understand you can specify a response or not.... So have it say nothing and load in the backgorund "Run the current_time 5 seconds every time a call starts". - something simple. It is no different then prompting in GPT. Just be creative and try, there is no "one" way.