Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide readOnlyHint and openWorldHint. The description adds specific outputs (benchmarks, yields) without contradicting annotations. It enhances transparency by detailing the nature of the read-only data, but does not cover all behavioral aspects.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.