Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full behavioral burden. It usefully discloses atomicity, schema auto-registration for novel opcodes, and 32-byte record packing, but omits mutation risk, overwrite semantics, required permissions, and error behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.