Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden for what is effectively a destructive consolidation. It does not say whether duplicate source files are deleted from disk or only merged in the project, whether timeline clips referencing duplicates get relinked, or whether the operation is reversible.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.