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 states the tool retrieves a list, implying a read-only operation, but doesn't clarify key aspects like whether it requires specific user permissions, how 'recently used' is determined, if there are rate limits, pagination details, or what the output format looks like (e.g., structured list, timestamps). This leaves significant gaps for an agent to understand the tool's behavior fully.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.