Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It does disclose that the figure is 'computed live' and specifies the exact output values (count and median). However, it does not mention read-only status, data freshness caveats, authentication requirements, or any limitations, leaving some behavioral context undisclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.