Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover read-only, idempotent, non-destructive, and closed-world traits. The description adds useful non-annotation context: it costs 1 unit, is decision-support only, and notably does not rank people — an important behavioral trait for a tool named suggest_lead.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.