Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered, but the description adds nothing beyond the raw endpoint path. It says nothing about pagination, result ordering, whether schedules are workspace-scoped, or what a schedule object contains — context an agent cannot get from 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.