Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover read-only, idempotent, open-world, and non-destructive behavior. The description adds valuable non-annotation behavioral context: the 10-credit cost, automatic slug resolution with no extra credit cost, and the dependence on companies_entity_id as a source for `id`. This goes beyond what structured fields reveal.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.