Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=false, and the description adds genuinely new behavioral context: it is stateless, performs no model fitting and no automatic ratification, so the agent knows not to expect a verdict. It also enumerates the output payload (raw errors, baselines, diagnostics, manifests). Minor gaps: no mention of cost, determinism or runtime.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.