Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must convey behavioral traits. It goes beyond a generic 'get' by listing the contract's contents (anti-generic composition rules, motion lifecycle, etc.), disclosing what the agent will receive. It does not mention side effects, but for a retrieval tool this is sufficient. The description adds substantial context beyond the tool name.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.