Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations cover key behavioral traits (readOnlyHint=true, destructiveHint=false, idempotentHint=true, openWorldHint=true), so the description's burden is lower. The description adds minimal value by implying a GET operation, but doesn't disclose additional context like authentication needs, rate limits, or what 'permissions' entail. No contradiction with annotations exists.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.