Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish readOnlyHint, idempotentHint, and destructiveHint=false; the description adds meaningful scope behavior: it returns every currently served file, not a filtered or source-level list, and frames the result as a deploy-time diff baseline. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.