Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, openWorld, non-destructive, so the safety profile needs no repeating. The description adds genuinely useful behavior beyond that: it returns the player object plus known FACEIT bans, and explicitly reports absence rather than returning empty. However, with an output schema present, the return-shape detail is modest incremental value, placing it just above baseline.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.