Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare read-only, idempotent, and non-destructive behavior, so the description only needs to add context beyond that. It does: empty results are ambiguous (genuinely no team vs. unrecognized posting id), and the call costs 10 credits. This is useful behavioral context that the annotations do not convey.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.