Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of conveying that this is a read operation. The word 'Gets' adequately implies no mutation, and 'current' indicates it reflects live state. However, it does not disclose what form the returned position takes (e.g., frames, seconds, timecode) or any behavior when the sequence is not open.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.