Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral burden. It discloses the one-review limit, update-on-recall behavior, self-review prohibition, and a rate limit (10/hour/IP). These go beyond what a typical schema would reveal, though error-handling details are omitted.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.