Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover the safety profile (readOnly, idempotent, openWorld=false, non-destructive), and the description adds genuine context beyond them: the provenance caveat that tables come from the official morphology engine and are 'not attested', plus guidance to switch on result.category before reading the body. Return-shape detail partially overlaps the existing output schema, so this stops short of 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.