Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide strong behavioral hints (readOnlyHint=true, destructiveHint=false, idempotentHint=true, openWorldHint=true), indicating a safe, non-destructive, repeatable read operation. The description adds minimal value by specifying it's a GET request, but doesn't disclose additional context like authentication needs, rate limits, or error conditions. 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.