Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral disclosure burden. It does state what the tool returns: inputs with units/ranges/defaults, outputs, assumptions, and tables. However, it does not explicitly say this is a read-only/introspection operation or clarify that it does not perform calculations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.