Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior. The description adds substantial behavioral detail beyond that: the [-100, +100] scale, exact role weights, P=+1/S=-1 handling, neutralization of option exercises/grants/tax withholdings, and the precise cluster_flag trigger condition. This fully explains how the score is computed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.