Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are present, so the description carries the full burden. It discloses that the operation is local, requires no key, and is potentially expensive because it recomputes every hash. It does not specify the return format or what happens if the chain is broken, but for a zero-parameter verification tool, the disclosed traits are valuable.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.