Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, openWorldHint=true, destructiveHint=false, making safety profile clear. Description adds valuable behavioral details: batch size ceiling of 50, GLEIF resolution for names, ranking by composite ESG score, and a latency nuance for name-based queries. No contradictions with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.