Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and does a good job: it discloses resource consumption (one owner Studio run, one of 2 swarm cycles/day), persistent behavior (briefs stay held), and a safety constraint (never posts off-desk). It does not detail output or failure behavior, but the disclosed side effects are meaningful and beyond what structured fields provide.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.