Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, readOnlyHint=false and openWorldHint=true, so the safety profile is covered structurally. The description adds genuinely useful behavioral context beyond them: the effect is reversible via kaiten_restore_card, which materially changes how an agent should weigh the destructive hint. It adds nothing about side effects on the card's tags/comments/checklists, so it is not a full 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.