Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds genuinely non-obvious behavior beyond that: authorization is via an opaque capability receipt, and the publication rule is strict — only an exactly merged commit counts as published, with proposed/reviewed states never exposed as public.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.