Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description states 'full replacement', implying that all fields are overwritten. However, it does not clarify behavior for optional parameters (e.g., what happens to 'color' if omitted) or mention side effects, permissions, or idempotency. Without annotations, the description partially conveys behavior but leaves ambiguity.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.