Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the burden of behavioral disclosure. 'Read' adequately signals non-mutating behavior, and specifying that it returns current nodes, links, and revision gives a snapshot-like expectation. However, it does not mention side effects, permissions, or any limitations, leaving some ambiguity for a tool with zero annotation support.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.