Clearly, you’re not going to do it for just Fibonacci. And yes, you can always rewrite the agent code, quit, and restart to modify the agent. This is just like using an LLM to modify Pi and then restarting, which is done today. But being able to rewrite code in a live, running system is useful for all the reasons that Lispers have done it that way for 50+ years. In some cases, you can’t just serialize your state and reload it easily. Sometimes, for instance, you might not even have access to the whole state because some of it resides on a remote server.