Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The readOnlyHint annotation already signals a safe read operation. The description adds value by specifying the informational scope (transform, topology, material, modifier), but it doesn't disclose any additional behavioral details such as output structure or potential edge cases, which is acceptable given the simple read-only nature.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.