Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish readOnlyHint, idempotentHint, and non-destructive behavior. The description adds useful behavioral context beyond that: the return includes full markdown, no auth is needed for site-wide wiki, and a colony page without the colony parameter resolves to NOT_FOUND.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.