Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so credit goes to what is added: the note that listing is free (no quota/cost concern) and that this tool returns ids rather than files. It stops short of describing ordering or pagination behavior of the result.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.