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 it's a creation operation. It doesn't disclose behavioral traits like whether this requires specific permissions, if it's idempotent, rate limits, error handling for partial failures, or what happens on success. 'Create' implies mutation, but details are missing.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.