Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. While 'merge' implies a read operation that combines data, the description doesn't clarify whether this creates a new record, sends an email, returns merged content, or has side effects. No information about permissions, rate limits, or what happens to the template or person data is provided.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.