Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare a mutating, non-idempotent, non-destructive operation, so the safety profile is covered. The description adds the useful behavioral detail that expectedSpecVersion guards against stale writes, but says nothing about what happens on a version mismatch, required permissions, or what state is changed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.