Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description must carry the full burden. It transparently discloses the exact percentiles returned (median, 10th, 25th, 75th, 90th), both hourly and annual, and explains the location filter with a default of national. This is good for a read-only tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.