Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Despite having annotations for readOnly and idempotent, the description adds crucial behavioral context beyond those hints: private colonies return NOT_FOUND for non-members, auth is optional but a token should be sent when the caller is a member, the ordering of the mod team (founder, admins, moderators, each alphabetized), and the 12-entry cap to mirror the web sidebar. There is no contradiction with the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.