Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The only added signal is 'full description' (an output-shape remark), and there is no disclosure of the auth requirement implied by the 'token' parameter, rate limits, or behavior on an unknown id.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.