Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of behavioral disclosure. It does state 'read-only', which conveys that the operation has no side effects. However, it does not disclose the output format, whether it works during an active attack, or any other behavioral details beyond the basic read-only guarantee.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.