Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover readOnly=false, destructiveHint=false and idempotentHint=true, so safety is established structurally. The description adds genuine context beyond them by declaring the operation 'Undoable', telling the agent a recovery path exists via edit_undo. It does not clarify partial-update behavior (that both fields are optional), which would have pushed it higher.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.