Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With destructiveHint=true already declared, the description goes well beyond annotations: it discloses the ACTIVE-vs-PENDING capacity outcome, that it never charges or upgrades, that an already-active keyword is returned unchanged (idempotency), that alerts are synchronized, and that no historical backfill occurs. This is exactly the side-effect context a mutation tool needs.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.