You’ve hit the nail on the head. In Linux kernel or database design, we strive for atomicity or idempotency. However, in the world of AI Agents—with all their external side effects and distributed dependencies—it’s a different beast entirely. You’re right: you can revert the internal state, but an outgoing email or an API write is like "spilled water." This is why I believe we need to introduce "Sandbox Transactions" or "Side-effect Probing" mechanisms at the Agent’s execution layer. In my engineering philosophy, if an action is irreversible, it must undergo much stricter isolation and verification before being committed. Moving from a "presume success" mindset to "defensive programming" is exactly what’s missing in today’s AI infrastructure. Glad we’re diving this deep—this is precisely the "hard nut" we need to crack.