Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations include readOnlyHint=true, so the safety profile is established. The description adds value by disclosing that certain fields (headingOutline, targetKeywords, contentAnalysis) are conditional on the page being asset-mapped. This is beyond the annotations and helps set expectations for what an agent will receive. However, it doesn't disclose other potential behaviors like error cases or pagination, but given it's a read operation with conditional content, 4 is appropriate. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.