Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Without annotations, the description must disclose behavioral traits. It does not mention side effects (e.g., whether it creates a new VM or overwrites), idempotency, error conditions (e.g., invalid path), or resource requirements. The minimal description leaves the agent uninformed about the tool's behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.