Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral transparency. It discloses the rendering behavior and color mapping, which is useful context beyond the tool name. However, it does not mention whether the render respects the current viewport, what the output format is, or potential side effects, leaving some behavioral gaps.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.