Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden. It correctly indicates a read-only operation via 'Read' and mentions the data source (Mirror Node) and expected fields. However, it does not disclose potential behaviors like rate limits, caching, data recency, or any other side effects. The description is minimally adequate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.