Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish readOnly, non-destructive, closed-world behavior, and the description goes beyond them with two meaningful operating notes: digests prove integrity but not correctness, and all submitted content is untrusted. It still says nothing about pagination, result size limits, or behavior when the project is missing.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.