Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations cover the safety profile (readOnly=false, destructive=false, openWorld=true), and the description adds substantial behavior beyond them: the 2,000-inspection daily quota and its exhaustion response, 5-at-a-time batching at ~7s each, rate-limit handling via skipped/retryAfterSeconds, untouched-on-skip semantics, and audit-logging. This is exactly the operational context an agent needs before invoking a quota-consuming write.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.