Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description must carry the full burden. It simply states 'Get IP routing table', which implies a read-only operation, but it does not disclose any potential side effects, prerequisites, or what the returned data contains. This lacks the context needed for an agent to fully anticipate tool behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.