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Structured Output

An LLM feature that constrains the model to return JSON matching a schema you specify: no free-form text, no parser errors.

What Is Structured Output?

Implemented as OpenAI response_format with json_schema, Anthropic tool-use mode, and Gemini response_schema. The model is forced to generate tokens that satisfy the schema during decoding. Removes the need for retry-on-malformed-JSON loops, which used to be a major source of agent flakiness in 2024-25.

How Groovy Web Uses This

Every production agent we ship uses structured-output mode for tool calls and decision steps. Eliminates parser-retry loops and makes downstream code reliable.

Related Terms

AI Agent Function Calling (AI) Multi-Agent System Tool Use (AI)

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