Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the behavioral burden. It usefully discloses two traits: the result is filtered to 'active' deployments only, and it is scoped to the caller's account rather than all accounts. It does not say whether results are paginated, what 'active' means, or what the response looks like.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.