Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full disclosure burden; it does add one useful behavioral trait ('No identifiers are retained') and implies ephemeral processing. However, it does not disclose whether network requests are made, whether processing is read-only, or what side effects if any exist.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.