Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and readOnlyHint=false, so the agent knows this mutates state. The description adds genuinely useful scope (draft/scheduled/pending only, and that it can 'cancel' rather than only hard-delete), but says nothing about irreversibility, permissions, or what happens to a post mid-publish.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.