Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description goes beyond by detailing which sensitive fields are excluded (org ids, prompts, credentials, integration config, arbitrary metadata) and uses the term 'safe metadata,' providing behavioral guarantees not present in the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.