Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=false, so the safety profile is covered. The description adds genuine behavioral context beyond that: results are Markdown and include sources and a measured reaction table, and the slugless mode returns a capped list of 25 recent articles.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.