Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It correctly implies a read-only operation (getting a score) and is not misleading. However, it does not disclose any potential behaviors like caching, authorization requirements, or error conditions, which are minimal but still unstated.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.