Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world behavior. The description adds useful context beyond that: no account, payment, paid body, or private data is involved, and it supports clients unable to read MCP resources. Rate limits or auth specifics are not mentioned, but the annotations carry the safety profile.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.