Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of disclosing behavior. It explains the kind of information returned (signals consumed, edges updated, confidence moves), which is useful, but it does not explicitly state whether the operation is read-only, whether it supports pagination, or what happens when no changes exist. It adds some transparency but leaves gaps.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.