Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden but only states it creates records in a single request. It doesn't disclose behavioral traits such as permissions needed, rate limits, error handling, whether it's idempotent, or what happens on partial failures. For a mutation tool with complex nested inputs, this is a significant gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.