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 '取得します' (get/retrieve) implies a read-only operation, the description doesn't explicitly state this or provide any other behavioral context such as authentication requirements, rate limits, error conditions, or what format the customization settings are returned in. For a tool with zero annotation coverage, this is a significant gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.