Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations exist, so the description carries the full burden for a state-changing operation. It doesn't say whether the pending secret is discarded, whether it errors when no setup is pending, whether an already-enabled 2FA is unaffected, or what authorization is required. Only the surface intent is conveyed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.