Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The destructiveHint=true annotation already declares this is a destructive operation, so the bar is lower. The description adds the useful irreversibility note ('can't be undone'), which reinforces permanence beyond the annotation's binary flag. However, it says nothing about side effects (e.g., whether the sound must be unused) or required permissions.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.