Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so safety is covered. The description adds real behavioral context beyond that: the specific signals aggregated, the upstream data source (deps.dev), and that the result is an actionable summary. It stops short of noting latency/cost of a multi-source composite call.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.