Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations present, the description carries the full burden and does add context: it discloses that the response includes player metadata (name, position, team), and 'Get' implies a read-only operation. However, it says nothing about pick ordering, behavior for an invalid or nonexistent draft_id, or auth/rate-limit expectations, so the behavioral picture is only partial.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.