Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover read-only, idempotent, non-destructive, closed-world behavior. The description adds meaningful traits beyond that: newest-first ordering, AND-composition of filters, the status='ready' default that hides drafts, cursor-based pagination with max limit 100, and a tier restriction. It does not cover auth or rate-limit behavior, but the added context is substantial.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.