Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds value by listing the returned content (blocked domains, anomaly rates, risk tier, incidents), but says nothing about freshness, caching, or error behavior for unknown codes — relevant given a get_data_freshness sibling exists.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.