Definition
Structured Output
A technique for constraining LLM responses to follow a specific format or schema, such as JSON, XML, or typed objects, ensuring reliable downstream processing.
In Depth
Structured output is critical for agents that need to interface with other systems. Instead of generating free-form text that needs fragile parsing, the model outputs data in a predefined schema — a JSON object with typed fields, an enum from a set of valid values, or a structured action plan. Modern LLMs support structured output natively through JSON mode or schema-constrained generation, making agent-to-system communication reliable and type-safe.
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