Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and idempotentHint=true, so the agent knows it's a safe, read-only, idempotent operation. The description adds context about the content (e.g., practical info for Sedona) but does not disclose additional behavioral traits like data sources or freshness.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.