Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden. It communicates that the tool returns a playbook and is meant for guidance, implicitly indicating a read-only, non-destructive action. However, it does not detail return format, behavior when parameters are omitted, or potential side effects, leaving some gaps.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.