Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations only cover the mutation/safety profile (readOnly=false, idempotent=false, openWorld=true). The description adds real behavioral detail beyond them: a 3-attempt cap, feedback returned on failed attempts, zero reward for repeating a passed submission, and the reward/badge thresholds. It stops short of describing auth or state persistence across the stay.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.