Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark the tool destructive, non-read-only, and closed-world; the description adds the important clarification that no Meta write occurs despite the local discard. It does not detail reversibility or auth, but the annotation coverage plus the no-Meta-write note is strong.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.