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. It explicitly states the operation is read-only ('GET /postframe/api-keys') and includes a rate limit (100 requests per 1m), which is valuable context. It does not mention response format or error behavior, but for a simple list operation this is sufficient.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.