Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare non-readOnly, idempotent, non-destructive, closed-world. The description adds meaningful behavior beyond them: a mandatory user-confirmation gate and a prompt-injection warning that quotedMaterial text is evidence rather than instruction. It does not describe post-restore state effects, but the safety profile is well covered.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.