Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It says verification is against a Bitcoin anchor, but does not disclose whether the operation is read-only, what permissions or network access are required, how failures are reported, or what a successful verification returns.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.