Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare idempotentHint=true, destructiveHint=false-ish behavior for reads, and destructiveHint=true; the description adds genuinely new context by stating the page is not deleted and the shareable URL is preserved, which tells the agent the operation is state-toggling and link-stable. It doesn't cover permission requirements or the already-unpublished case, but the added side-effect detail exceeds what annotations convey.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.