Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral disclosure burden. It clearly states the requested action, the required target state ('running'), and the timing of the stop ('on the next BSL instruction'), which provides useful non-obvious behavior. It does not mention return values or failure behavior, but the core effect is transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.