Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden but only states the basic operation. It doesn't disclose whether this is a read-only operation, whether it requires specific permissions, if there are rate limits, what format the inventory items are returned in, or if there are pagination details beyond the 'page' parameter. For a list operation with zero annotation coverage, this is insufficient.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.