Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and non-destructive, so the safety profile is covered by structured data. The description adds one useful prerequisite ('for a loaded module'), but says nothing about the pagination implied by limit/offset defaults, nor about truncation or error behavior for unloaded modules.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.