Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish readOnly, idempotent, openWorld and non-destructive behavior, so the safety profile is covered. The description adds the authoritative source (XBRL data in the company's filings) and clarifies that values are as-reported rather than derived, which is useful context, but it says nothing about coverage gaps, rate limits, or fallback behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.