Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
There are no annotations, so the description itself must disclose core behavior. It does communicate offline, no-upload, and user-visible verification behavior, which is meaningful and suggests a read-only, side-effect-free operation. However it doesn't state what exactly is returned (file content? rendered preview?), how errors like missing files are handled, or whether there any side effects beyond displaying results. It's useful but incomplete.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.