Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden and discloses almost nothing: it does not say whether pausing is reversible, whether it requires an active take or recording room, whether session state changes elsewhere, or how it differs from stopping. Only the faint implication that recording is interrupted is conveyed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.