Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and does well: it discloses ordering (newest first), a hard row cap (max 2000), the event shape, and the non-obvious semantics of side=long. It omits any mention of the `minutes` window or auth/rate-limit behavior, which are the remaining behavioral gaps for a no-annotation tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.