Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden, yet it discloses almost nothing about behavior: not whether the move is destructive, whether other clips are re-indexed, whether it requires auth or an unlocked timeline, or what it returns. The only real disclosure is the 1-based indexing semantics, which is useful but thin for a mutation tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.