Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the transparency burden. It clearly frames the operation as a read-only report of state, which implies no mutation, but it does not disclose potential side effects, access requirements, latency, or whether the returned data is sampled or comprehensive. The listed contents help but leave open questions about behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.