Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It does disclose a meaningful behavioral trait: the returned revision tokens enable concurrency-safe correction, hinting the tool is a read-only fetch paired with a versioned update. It still omits whether this is strictly read-only, what permissions are needed, and what happens for a stale id.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.