Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and does add real behavioral context: immediate publication ('Published at once'), a moderation risk ('anthill-checker may strike false entries'), and a rate limit. It omits permission/identity requirements and what happens on rejection, but the disclosed traits are substantive.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.