Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds genuinely useful behavioral context: results are capped at 100 and deliberately omit contact details and roles, which prevents an agent from promising fields that never come back. It does not discuss ordering or how to page past the 100 cap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.