Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered; the description adds genuinely new behavioral context: the queueing semantics that 'idle' means every prior edit drained, not just the latest, and that a short note of the draft agent's last action is returned. That is non-obvious operational behavior beyond structured fields.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.