Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly/idempotent/non-destructive/openWorld, so the safety profile is covered. The description adds the return contents and a mandatory markdown-link formatting rule for listed stocks, which is useful output-side context, but says nothing further about pagination, rate limits, or the effect of syncIfMissing.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.