Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the burden of behavioral disclosure. It adds useful context by stating the source is a public RSS feed and that stories are 'fresh', implying no authentication and recent content. However, it does not disclose the output shape, how many stories are returned, or whether full article content is included.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.