Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral burden. It explains what the tool returns (matched-study impact, scaled by property share) and the units, but does not disclose methodology limitations, whether values can be negative, or how the scaling is computed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.