Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover readOnly, idempotent, non-destructive, and openWorld. The description adds real value on top: it discloses the source platform (Polymarket), the derived metric (skill-weighted money vs. market odds) and its provenance (x402Pulse scoring), plus a non-advisory disclaimer.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.