Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, non-destructive and openWorld behavior, so safety is fully covered. The description adds nothing beyond restating the name — no note on scope, cross-project access, or failure behavior for a missing ID. With an output schema present, return format needn't be described, but the description still contributes no behavioral context beyond the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.