Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The operation is clearly a read-only list action, which implies safety, but the description does not disclose behavior such as error handling when the file is missing, the exact return format, or whether it always reads from disk. Without annotations, the description carries some burden, and it provides partial transparency by specifying the source file and included fields.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.