Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description is the only source of behavioral context. It communicates that the tool reports on last month's top performers, current analogs, and model takeaways, which is substantive, but it does not clarify whether this is a static report, how results are derived, or any limitations of the data.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.