Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate readOnlyHint, openWorldHint, and idempotentHint, but the description adds valuable behavioral context: it analyzes MMM signals from FreeWheel Marketplace and Common Crawl, and returns structured data with source provenance and confidence scores. This goes beyond the annotations without contradiction.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.