Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and a closed world, so the safety profile is fully covered structurally. The description adds the useful constraint that pricing data is deliberately omitted, sparing the agent from expecting cost fields, but says nothing about lookup failures, authorization, or missing-model behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.