Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the transparency burden. It adds useful context by clarifying that coverage_status indicates coverage levels and that last_activity_at refers to label-DB activity, not on-chain transaction time. However, it does not disclose other behavioral traits (e.g., pagination, rate limits) beyond schema details.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.