Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full behavioral burden but conveys only that a mutation occurs ('Move'). It does not disclose what happens when index is omitted, whether forbidden moves (into itself or a descendant) are blocked, or whether auto-layout parents reflow — all key behaviors for a tree-restructuring operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.