Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, openWorldHint, and idempotentHint, and the description adds behavioral context: data sources (USPTO PatFT, BLS API), output type (12-month projections with confidence scores), and input constraints (skills list, region, horizon). This goes beyond annotations without contradicting them.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.