Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The readOnlyHint annotation already communicates the safe read-only nature. The description adds the expectation that 'full details' will be returned, but it does not disclose any further behavioral traits such as payload size, response format, required authentication, or rate limits. This is acceptable but minimal.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.