Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and openWorldHint=true, so the mutation risk is structured data. The description adds genuinely new behavioral facts: the work is asynchronous ('в фоне'), chunked ('порциями') and restart-resilient ('переживает перезапуск') — but says nothing about what happens to already-deleted files, whether the call is idempotent, or what handle it returns for tracking.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.