Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false, idempotentHint=false and destructiveHint=false, so the safety profile is largely covered. The description adds one genuinely useful behavioral fact beyond the structured data: the operation is restricted to posts you own. It says nothing about reversibility, which is notable given destructiveHint=false on a deletion tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.