Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It conveys a read-only ranking behavior and the highest/lowest intent, but it does not disclose edge-case behavior like ties, nulls, default sort order, or what the returned rows look like. The schema partially covers defaults, but the description itself is minimal.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.