Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond destructiveHint=true, it discloses irreversibility, the downstream consequence on views (an EMPTY slot), and the required prerequisite action, plus an ownership constraint. This is exactly the kind of context annotations cannot carry, so the description meaningfully extends the safety profile.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.