Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden and does well by disclosing authentication requirements ('REQUIRES AUTHENTICATION', 'Must call login() first'), return format details, and filtering behavior. However, it doesn't mention rate limits, pagination, or error conditions, which would be helpful for a notification-fetching tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.