Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description provides important behavioral context: coverage_status definitions and clarification that last_activity_at is label-DB activity, not on-chain. Missing details on error handling or authentication, but these are acceptable for a read-only lookup.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.