Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, so safety is covered. The description goes further by enumerating what is returned (status, progress, hyperparameters, token counts, cost, output model name) and naming the underlying REST call, which is genuinely useful behavioral detail given there is no output schema. It omits auth and rate-limit context, so not a 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.