Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full disclosure burden. 'Mengambil' implies a read-only operation, but it says nothing about authentication requirements (a sibling login tool exists), whether the result reflects the current semester, or what an empty schedule looks like. Given the zero-parameter simplicity, this is a moderate gap rather than a critical one.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.