Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It discloses credit cost, authentication requirement, output format (base64-encoded PDF), return schema (ok, pdf_base64, feature_count, truncated, size_bytes), and that it produces one page with map and table. It does not detail error handling or validation, but covers key behavioral traits.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.