Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of disclosing behavior. It states what will be checked (rules, sitemaps listed, reachability, URL counts) and implies a read-only network audit. It does not cover error cases or rate limits, and the 'HTTP x402 price' note is cryptic, but core behavior is clearly communicated.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.