Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond the annotations, the description discloses key behavioral details: points represent two opposite bounding-box corners in board world coordinates, text is optionally bound inside the shape, and the shape grows downward to fit long text. It is transparent without contradicting the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.