Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral transparency burden. It does add useful context by noting the data comes from a public RSS feed and is 'fresh,' implying no authentication is needed and the data is current. However, it does not describe output shape, pagination, or limits, so coverage is only partial.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.