Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It usefully discloses that the scratchpad is reset and persistent registers remain intact, but it does not state whether the reset is destructive/recoverable, idempotent, permission-gated, or what happens for an unknown entity_id.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.