Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations provide readOnlyHint, openWorldHint, idempotentHint. The description adds value by disclosing data sources (USPTO PatFT, EPO Espacenet) and outputs (list, ownership status, flagged gaps, assignment details). It reveals the tool's external data reliance and scope, enhancing transparency beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.