Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must convey behavioral traits. It mentions the incremental nature and token efficiency (~30-50 vs 800), which is useful. However, it does not disclose whether the operation is read-only, what happens when no changes exist, or the response structure beyond the format parameter in the schema. It provides some context but not comprehensive behavioral disclosure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.