Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It transparently states blocking behavior, terminal states, and timeout behavior. However, it does not disclose what happens on timeout (e.g., return value, error, or current status) or what the tool returns when the task settles.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.