Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly=true, idempotent=true, destructive=false, and openWorld=false, so the safety profile is fully covered without description help. The description adds useful scope context that the payload is a fixed rulebook (steps, pillars, levels, stages, no-exception rules), but says nothing about size, caching, or ordering beyond that.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.