Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry behavioral details. The 'Get' verb and 'digest' wording reasonably signal a read-only, aggregate operation across the DAG, but the description does not disclose what data the digest contains, whether it is aggregated, or any permission/error behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.