Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description is the sole source of behavioral info. It reveals that JavaScript rendering can be enabled via parameter, and the return type is a dictionary. However, it does not disclose error handling, rate limiting, origin restrictions, or what happens when selectors find no elements. The example provides some clarity but not comprehensive transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.