Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It only says 'trigger an automation' without describing side effects, permissions, or what happens when triggered (e.g., executing actions). Critical behavioral traits like idempotency or potential errors are missing.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.