Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, idempotentHint=true and openWorldHint=true, so the description's marginal job is to explain consequences — e.g. that deletion is permanent, whether related delivery records survive, whether confirmation is needed. It supplies none of that. It does not directly contradict the annotations (it never claims read-only), so this is omission rather than contradiction.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.