Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=true, so the description adds value by specifying the geographic scope (Sedona, Red Rock Country), the number of trails (15), and the types of information provided (pass requirements, restrictions, pro tips). This context enhances behavioral transparency beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.