Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full behavioral burden, and it does disclose a critical trait beyond the schema: the tool depends on CakeScript (T1) and is non-functional in this build. It says nothing about permissions, return shape, or ordering, but the unavailability flag is the highest-value disclosure an agent needs.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.