Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond the annotations (destructive, non-idempotent), the description discloses the critical side effects: edits apply immediately with only a 30-second undo window, and replace-section silently drops non-text blocks such as images and files. It also explains that sectionHeading matching is case-insensitive after trimming, which is behavior an agent cannot infer from 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.