Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It reveals only that Grafana Pro is required; it does not disclose whether this writes files, calls the Grafana API, requires authentication (despite the api_key parameter), or what side effects generation has. The 'Pro feature' hint is minimal real information.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.