Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate read-only, idempotent, and non-destructive behavior, and the description adds meaningful context: no auth required, public wiki, summaries only, exact fields returned, and bodies excluded. The total field explanation also clarifies pagination semantics beyond what annotations provide.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.