Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full disclosure burden. It doesn't say whether the tool is read-only, whether it inserts content into the editor or merely returns text, or what the sample demonstrates (scripting API? syntax template?). "Return" hints at a read, but nothing is stated.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.