Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of explaining behavior. It conveys that the tool is informational, returning a description of inputs, outputs, assumptions, and tables rather than performing a calculation. Still, it does not explicitly state that no calculation is executed, whether the tool is safe/read-only, or what the response format will look like.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.