Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden for disclosing side effects. It only says 'delete', implying destructiveness, but does not state irreversibility, effects on tabs/buffers, errors for missing names, or whether deletion is idempotent. A destructive tool needs at least one caveat.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.