Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered structurally. The description adds only that the returned value is a secret, without noting sensitivity, exposure risk, caching, or whether the same key is returned for every node, so it contributes little beyond the structured fields.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.