Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so safety is covered. The description still adds real value by disclosing the return shape (audit-level status enum, 'N/M' progress, per-target statuses) and the owner-scoping rule that foreign auditIds surface as notFound.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.