An agent idling and then acting on it's own to hack HF is has nothing to do with guard rails.

Someone had to give the agent some instructions, like "hack X", "Find exploit for Y" or "Do whatever havoc you can think of" - either way the agents didn't not act on their own. They might hack HF on their own, today Claude decided to play sound through the sound pipeline I instructed it to build and measure it to see if it works, but it didn't install the sound pipeline because it hasn't had anything better to do but because I instructed it that way.