Package com.tnsai.evaluation.evaluators

Class JsonCorrectnessEvaluator

java.lang.Object

com.tnsai.evaluation.evaluators.JsonCorrectnessEvaluator

All Implemented Interfaces:

Evaluator

public final class JsonCorrectnessEvaluator
extends Object
implements Evaluator

Evaluates JSON correctness of agent output — parse validity, required fields, and type conformance. Zero LLM cost, fully deterministic.

Metadata keys:

• json_schema — JSON Schema string (optional, for field/type validation)
• required_fields — List<String> of required top-level keys
• strict — Boolean if true, invalid JSON scores 0.0 overall

Scoring

• json_valid: 1.0 or 0.0
• required_fields: present / total required
• type_correct: correctly typed / total checked
• overall: weighted average

Since:

0.3.0

Nested Class Summary

Nested classes/interfaces inherited from interface com.tnsai.evaluation.spi.Evaluator

Evaluator.EvaluationInput

Constructor Summary

Constructors

Constructor	Description
JsonCorrectnessEvaluator()

Method Summary

Modifier and Type	Method	Description
EvaluationResult	evaluate(Evaluator.EvaluationInput context)	Evaluates agent behavior for a single interaction.
String	name()	Unique name for this evaluator.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

JsonCorrectnessEvaluator

public JsonCorrectnessEvaluator()

Method Details

name

public String name()

Description copied from interface: Evaluator

Unique name for this evaluator.

Specified by:

name in interface Evaluator

evaluate

public EvaluationResult evaluate(Evaluator.EvaluationInput context)

Description copied from interface: Evaluator

Evaluates agent behavior for a single interaction.

Specified by:

evaluate in interface Evaluator

Parameters:

context - evaluation context containing input, output, tool calls, etc.

Returns:

evaluation result