Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It discloses return data categories and parameter constraints (max limit, default frequency, optional state). However, it omits behavioral details like authentication, error handling, or data ordering. The max limit and national-state default are useful, but more transparency would be expected.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.