Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full behavioral burden. It indicates the tool returns a prioritized set, which implies a read-only operation, but it does not explain how prioritization works, what counts as 'low-reply,' whether pagination applies, or what the response shape looks like.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.