Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, openWorldHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is fully covered. The description adds the concrete data sources and the fact that it's 'free', which is useful context beyond annotations. It doesn't disclose potential rate limits or delays from aggregating multiple services, but for a read-only tool with strong annotation coverage, this is a minor gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.