Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, covering safety and world-model expectations. The description adds minimal behavioral context by enumerating what a workspace contains (agreed conditions, deadline, current state), which gives some expectation of the response contents. It does not disclose details like whether the workspace state is cached, whether additional fields exist, or how errors surface, but with strong annotations the bar is lower.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.