Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The readOnlyHint annotation already indicates this is a safe read operation. The description adds the output format (PEM), which is useful but minimal. It does not disclose additional behavioral traits such as error handling, rate limits, or whether the CA must exist. With annotations present, the bar is lower, and the description meets the minimum by not contradicting the read-only nature.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.