Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond the readOnlyHint annotation, the description details that no inference is run by CivilQuants, the returned body is a system instruction, and different response bodies (TIER_INSUFFICIENT, INVALID_TOKEN) occur based on caller status. It also explains prerequisites for document-heavy skills, adding significant behavioral context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.