Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations only set all hints false, so the description carries the behavioral burden. It discloses thread reuse, mod-roster seeding, and the banned-user recourse property, going beyond the schema. It doesn't describe rate limits or side effects, but the main behavioral traits are covered.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.