Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of explaining behavior. It discloses the output contents in useful detail (pros, cons, pricing tiers, alternatives) and notes input flexibility (slug or display name). It does not mention error behavior for unknown tools, but for a simple lookup tool this is a reasonable level of transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.