Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. 'Check' implies a read-only operation with no side effects, which is useful, but the description does not disclose behavior such as response format, error handling when unauthenticated, or whether token validity checks trigger network calls.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.