Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so safety is covered. The word "preview" hints that nothing is mutated, but the description says nothing about what a cascade preview returns, how deep it traverses, or what a caller should do with it — a real gap for a read endpoint whose whole value is the shape of its response.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.