Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true and readOnlyHint=false. The description adds 'permanently' and a warning, which is consistent and slightly extends the annotation. It does not disclose other behavioral aspects like the need for confirmation (though the schema covers that) or consequences of deleting a referenced view. Given the annotation coverage, the bar is lower, and the description adds some context but not rich detail.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.