Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description must disclose behavioral traits. It only states 'download an attachment' without mentioning side effects (e.g., writing to local filesystem, potential overwriting), required permissions, or error conditions. For a tool that mutates the local filesystem, this is insufficient transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.