Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover safety (readOnlyHint, idempotentHint, non-destructive). The description adds substantial beyond-annotation behavior: sort order (most recently edited first), default page size (20 per page), and that article text is excluded from results. It doesn't state total counts or cursor exhaustion behavior, keeping it from a 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.