The invalidation layer may be just as important as the persistence layer here. At IT Path Solutions, we’ve found that persistent agent state becomes much safer when the system can distinguish between information that was never verified and information that was verified but is no longer valid. In a changing environment, allowing an old verified state to remain trusted can be more dangerous than having no memory at all. I like the idea of tracking instance changes because it gives the system a concrete trigger for revalidation. It could be even more useful if the invalidation reason became part of the state, whether the target changed, credentials expired, a process disappeared, or the original evidence became stale. That would give the agent a much clearer basis for deciding when it can safely resume and when it needs to verify again.