CCAR-F objective 4.3 · Domain 4 · 20% of the exam
Structured Output with Tool Use
Prose describing a shape leaves the model to produce it; a tool input schema makes the shape part of the request. Two things have to be settled and items often test both at once: what the structure is, which the schema fixes, and that a structured response is produced at all, which requiring the tool call fixes. A required field with no way to express absence is the trap worth carrying in, because the model then chooses between breaking the schema and inventing a value, and it invents. Prefilling the response was the older way to force a shape and is no longer where a new service should start.
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The rest of domain 4: Prompt Engineering and Structured Output
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