Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description must carry the full burden of behavioral disclosure. It adds value by specifying the ET timezone for start_time/end_time and by instructing the agent to review the returned time entry for what was actually added, hinting at possible modifications. However, it does not mention potential validation errors, permission requirements, or constraints like overlapping entries, leaving some behavioral aspects opaque.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.