Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare read-only, idempotent, non-destructive behavior, so the safety burden is lifted. The description adds useful non-obvious context: results are ranked by attestation and include text, reducing a follow-up lookup. It doesn't mention result count limits or pagination, but the schema's limit param covers that.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.