Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
There are no annotations to convey safety or side-effect information, so the description must carry the burden. 'Trigger' alone does not disclose whether the operation blocks, performs a single-shot or continuous measurement, resets previous state, or returns any value, which is inadequate for an agent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.