Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false and openWorldHint=true, so the safety profile is covered structurally. The description adds nothing beyond that – no mention of required parent objects (study, kill chain, elementary action), side effects, or that the body shape is unvalidated. With annotations carrying the burden, this is a minimal-but-not-zero score.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.