Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full responsibility for behavioral disclosure. 'Refresh' is vague about side effects: whether it reloads from disk, invalidates a cache, mutates stored data, or is idempotent. The description focuses on the trigger rather than what actually happens during refresh.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.