Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and closed-world, so the safety profile is fully covered structurally. The description adds nothing beyond 'Read' – no note on what the summary contains, freshness, or whether a test must be completed first.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.