Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world, so the safety profile is covered. The description adds real value beyond that by scoping returned data ('metadata/approved fields only; no secrets, contacts or original files') and hinting at an authorisation gate, but says nothing about pagination limits, retention, or what a 'week' spans.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.