Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Goes well beyond annotations by disclosing rate limits (3 per client per day, 30 overall), the one-submission-per-draft rule, and exactly which fields get published plus the privacy guarantee that email is never published. Missing only what an error or a rejected submission returns, though the output schema covers return shape.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.