Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, which the description aligns with by describing a comparison operation. The description adds behavioral context (e.g., 'which pass covers them and whether it beats buying window lift tickets') beyond annotations, though no detailed edge cases are mentioned.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.