Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It discloses the traceability intent but omits whether the referenced truths must already exist, what happens on invalid refs, permission requirements, or how this relates to the invalidation workflow.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.