Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With destructiveHint=true already declared, the description adds real operational context: effect is immediate ('Future views stop immediately') and irreversible for already-copied content ('previously copied or downloaded information cannot be recalled'), plus an authorization constraint (creator-only). It doesn't address idempotent re-calls despite idempotentHint=true, so it stops short of 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.