Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the behavioral burdenags. It says 'Update' which implies a write operation, but it does not warn about potential side effects (e.g., configuration changes may break ECP), does not state that the confirmation flag is required, and gives no sense of irreversibility. A cautious agent would need more transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.