Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already flag destructiveHint=true, but the description adds substantial context beyond them: token deletion, removal from pending and recurring posts, plan-count impact, published posts remaining on the network, and the Facebook per-page scoping rule. It also names the required permission (accounts.manage, held by Admin), which annotations cannot convey.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.