Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, openWorld, and non-destructive. The description adds genuine behavioral context beyond them: content is read at call time from the house's own page, nothing is generated, Scripture is re-read from a stored King James text, and it is 'honest when no page matches' (disclosing fallback behavior). This is meaningful disclosure for a retrieval tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.