Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of explaining what the tool returns, and it does: inputs with units/ranges/defaults, outputs, assumptions, and tables. It does not mention response format or side effects, but for a read-only describe tool, the disclosed content is sufficient.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.