Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description usefully clarifies that entries are per-generation cost figures, but says nothing about ordering, pagination behavior despite a 'page' parameter, result size, or account scoping. Given annotation coverage, this is a moderate contribution rather than a rich one.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.