Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare it is a non-readOnly, non-destructive, idempotent mutation, but the description adds critical context the annotations cannot: the partial-update semantics (omitted args unchanged), the mandatory confirmation-token handshake, and the permission/role gate. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.