Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint and openWorldHint, so the safety profile is covered. The description adds a genuinely useful trait beyond the annotations: the required 'Manage Server' permission, which an agent must verify before invoking. It still omits return shape/pagination, but with annotations present this is a solid addition.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.