optimize() API

GEPA, Pareto, artifact, and optimizer APIs.

Most Used

`AxBootstrapFewShot`

Abstract base class for optimizers that provides common functionality and standardized handling of AxOptimizerArgs

Field	Value
Kind	`class`
Form	`AxBootstrapFewShot`
Source	source

Call Shape

TypeScript

new AxBootstrapFewShot(args: Readonly<AxOptimizerArgs & object>): AxBootstrapFewShot;

Full reference

`AxGEPA`

Single-module GEPA (reflective prompt evolution with Pareto sampling)

Field	Value
Kind	`class`
Form	`AxGEPA`
Source	source

Call Shape

TypeScript

new AxGEPA(args: Readonly<AxOptimizerArgs>): AxGEPA;

Full reference

`AxOptimizedProgram`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxOptimizedProgram`
Source	source

Call Shape

TypeScript

applyTo<IN, T>(program: AxGen<IN, T>): void;

Full reference

`optimize`

TypeScript function exported by @ax-llm/ax. See the call shape, arguments, and full reference below.

Field	Value
Kind	`function`
Form	`optimize`
Returns	`Promise`<`AxParetoResult`<`OUT`>>
Source	source

Call Shape

TypeScript

function optimize<IN, OUT>(
   program: Readonly<AxProgrammable<IN, OUT>>, 
   examples: readonly AxTypedExample<IN>[], 
   metricFn: 
  | AxMetricFn
  | AxMultiMetricFn, 
options: Readonly<AxOptimizeOptions>): Promise<AxParetoResult<OUT>>;

Arguments And Options

Name	Type	Description
`program`	`Readonly`<`AxProgrammable`<`IN`, `OUT`>>
`examples`	readonly `AxTypedExample`<`IN`>[]
`metricFn`	\\| `AxMetricFn` \\| `AxMultiMetricFn`
`options`	`Readonly`<`AxOptimizeOptions`>

Full reference

Advanced / internals / full reference

`AxACEOptimizationArtifact`

Serialized artifact saved after optimization for future reuse.

Field	Value
Kind	`interface`
Form	`AxACEOptimizationArtifact`
Source	source

Full reference

`AxACEOptimizedProgram`

Optimized program artifact that persists ACE playbook updates.

Field	Value
Kind	`class`
Form	`AxACEOptimizedProgram`
Source	source

Call Shape

TypeScript

new AxACEOptimizedProgram<OUT>(config: object): AxACEOptimizedProgram<OUT>;

Full reference

`AxAgentDemos`

Demo traces for AxAgent’s split architecture. Actor demos use the runtime code field (javascriptCode for JavaScript, <language>Code for other runtimes such as pythonCode). Responder demos use the agent’s output type + optional input fields.

Field	Value
Kind	`typealias`
Form	`AxAgentDemos`
Source	source

Call Shape

TypeScript

type AxAgentDemos<IN, OUT, PREFIX> = 
  | {
  programId: `${PREFIX}.actor`;
  traces: Record<string, AxFieldValue>[];
}
  | {
  programId: `${PREFIX}.responder`;
  traces: OUT & Partial<IN>[];
};

Full reference

`AxAgentOptimizationTargetDescriptor`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxAgentOptimizationTargetDescriptor`
Source	source

Call Shape

TypeScript

type AxAgentOptimizationTargetDescriptor = object;

Full reference

`AxAgentOptimizeOptions`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxAgentOptimizeOptions`
Source	source

Call Shape

TypeScript

type AxAgentOptimizeOptions<_IN, _OUT> = object & Pick<AxOptimizerArgs, 
  | "numTrials"
  | "minibatch"
  | "minibatchSize"
  | "earlyStoppingTrials"
  | "minImprovementThreshold"
  | "sampleCount"
| "seed">;

Full reference

`AxAgentOptimizeResult`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxAgentOptimizeResult`
Source	source

Call Shape

TypeScript

type AxAgentOptimizeResult<OUT> = AxParetoResult<OUT>;

Full reference

`AxAgentOptimizeTarget`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxAgentOptimizeTarget`
Source	source

Call Shape

TypeScript

type AxAgentOptimizeTarget = "actor" | "responder" | "all" | readonly string[];

Full reference

`AxBaseOptimizer`

Abstract base class for optimizers that provides common functionality and standardized handling of AxOptimizerArgs

Field	Value
Kind	`class`
Form	`AxBaseOptimizer`
Source	source

Call Shape

TypeScript

new AxBaseOptimizer(args: Readonly<AxOptimizerArgs>): AxBaseOptimizer;

Full reference

`AxBootstrapOptimizerOptions`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxBootstrapOptimizerOptions`
Source	source

Full reference

`axCreateDefaultOptimizerColorLogger`

Factory function to create a default optimizer logger with color formatting

Field	Value
Kind	`function`
Form	`axCreateDefaultOptimizerColorLogger`
Returns	`AxOptimizerLoggerFunction`
Source	source

Call Shape

TypeScript

function axCreateDefaultOptimizerColorLogger(output: (message: string) => void): AxOptimizerLoggerFunction;

Arguments And Options

Name	Type	Description
`output`	(`message`: `string`) => `void`

Full reference

`axCreateDefaultOptimizerTextLogger`

Factory function to create a text-only optimizer logger (no colors)

Field	Value
Kind	`function`
Form	`axCreateDefaultOptimizerTextLogger`
Returns	`AxOptimizerLoggerFunction`
Source	source

Call Shape

TypeScript

function axCreateDefaultOptimizerTextLogger(output: (message: string) => void): AxOptimizerLoggerFunction;

Arguments And Options

Name	Type	Description
`output`	(`message`: `string`) => `void`

Full reference

`axDefaultOptimizerLogger`

Default optimizer logger instance with color formatting

Field	Value
Kind	`variable`
Form	`axDefaultOptimizerLogger`
Source	source

Call Shape

TypeScript

const axDefaultOptimizerLogger: AxOptimizerLoggerFunction;

Full reference

`axDefaultOptimizerMetricsConfig`

TypeScript variable exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`variable`
Form	`axDefaultOptimizerMetricsConfig`
Source	source

Call Shape

TypeScript

const axDefaultOptimizerMetricsConfig: AxOptimizerMetricsConfig;

Full reference

`axDeserializeOptimizedProgram`

TypeScript function exported by @ax-llm/ax. See the call shape, arguments, and full reference below.

Field	Value
Kind	`function`
Form	`axDeserializeOptimizedProgram`
Returns	`AxOptimizedProgramImpl`<`OUT`>
Source	source

Call Shape

TypeScript

function axDeserializeOptimizedProgram<OUT>(serialized: Readonly<AxSerializedOptimizedProgram<OUT>>): AxOptimizedProgramImpl<OUT>;

Arguments And Options

Name	Type	Description
`serialized`	`Readonly`<`AxSerializedOptimizedProgram`<`OUT`>>

Full reference

`AxGEPAAdapter`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxGEPAAdapter`
Source	source

Call Shape

TypeScript

evaluate(
   batch: readonly Datum[], 
   candidate: Readonly<Record<string, string>>, 
   captureTraces?: boolean): 
  | AxGEPAEvaluationBatch<Traj, Out>
| Promise<AxGEPAEvaluationBatch<Traj, Out>>;

Full reference

`AxGEPABatchEvaluation`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxGEPABatchEvaluation`
Source	source

Call Shape

TypeScript

type AxGEPABatchEvaluation = object;

Full reference

`AxGEPABatchRow`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxGEPABatchRow`
Source	source

Call Shape

TypeScript

type AxGEPABatchRow = object;

Full reference

`AxGEPABootstrapOptions`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxGEPABootstrapOptions`
Source	source

Full reference

`AxGEPAComponentBanditState`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxGEPAComponentBanditState`
Source	source

Call Shape

TypeScript

type AxGEPAComponentBanditState = object;

Full reference

`AxGEPAComponentSelector`

TypeScript class exported by @ax-llm/ax. See the constructor, methods, and full reference below.

Field	Value
Kind	`class`
Form	`AxGEPAComponentSelector`
Source	source

Call Shape

TypeScript

new AxGEPAComponentSelector(targets: readonly AxGEPAComponentTarget[], initialState?: Readonly<Record<string, AxGEPAComponentBanditState>>): AxGEPAComponentSelector;

Full reference

`AxGEPAComponentTarget`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxGEPAComponentTarget`
Source	source

Call Shape

TypeScript

type AxGEPAComponentTarget = object;

Full reference

`AxGEPAEvaluationBatch`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxGEPAEvaluationBatch`
Source	source

Full reference

`AxGEPAEvaluationState`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxGEPAEvaluationState`
Source	source

Call Shape

TypeScript

type AxGEPAEvaluationState = object;

Full reference

`AxGEPAOptimizationReport`

Structured optimization report

Field	Value
Kind	`interface`
Form	`AxGEPAOptimizationReport`
Source	source

Full reference

`AxGEPAReflectiveTuple`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxGEPAReflectiveTuple`
Source	source

Call Shape

TypeScript

type AxGEPAReflectiveTuple = object;

Full reference

`AxGEPATraceSummary`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxGEPATraceSummary`
Source	source

Call Shape

TypeScript

type AxGEPATraceSummary = object;

Full reference

`AxGEPATraceSummaryCall`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxGEPATraceSummaryCall`
Source	source

Call Shape

TypeScript

type AxGEPATraceSummaryCall = object;

Full reference

`axGetOptimizerMetricsConfig`

TypeScript function exported by @ax-llm/ax. See the call shape, arguments, and full reference below.

Field	Value
Kind	`function`
Form	`axGetOptimizerMetricsConfig`
Returns	`AxOptimizerMetricsConfig`
Source	source

Call Shape

TypeScript

function axGetOptimizerMetricsConfig(): AxOptimizerMetricsConfig;

Full reference

`AxOptimizationCheckpoint`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxOptimizationCheckpoint`
Source	source

Full reference

`AxOptimizationProgress`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxOptimizationProgress`
Source	source

Full reference

`AxOptimizationStats`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxOptimizationStats`
Source	source

Full reference

`AxOptimizedProgramImpl`

TypeScript class exported by @ax-llm/ax. See the constructor, methods, and full reference below.

Field	Value
Kind	`class`
Form	`AxOptimizedProgramImpl`
Source	source

Call Shape

TypeScript

new AxOptimizedProgramImpl<OUT>(config: object): AxOptimizedProgramImpl<OUT>;

Full reference

`AxOptimizeOptions`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxOptimizeOptions`
Source	source

Call Shape

TypeScript

type AxOptimizeOptions = AxOptimizerArgs & Omit<AxCompileOptions, "bootstrap"> & object;

Full reference

`AxOptimizer`

Interface for optimizing AI programs through automated prompt tuning.

Field	Value
Kind	`interface`
Form	`AxOptimizer`
Source	source

Call Shape

TypeScript

const optimizer = new AxBootstrapFewShot({ maxDemos: 4 });

const result = await optimizer.compile(
  program,
  trainingExamples,
  ({ prediction, example }) => prediction.answer === example.expectedAnswer ? 1 : 0
);

// Apply optimized demos to program
program.setDemos(result.demos);

Full reference

`AxOptimizerArgs`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxOptimizerArgs`
Source	source

Call Shape

TypeScript

type AxOptimizerArgs = object;

Full reference

`AxOptimizerLoggerData`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxOptimizerLoggerData`
Source	source

Call Shape

TypeScript

type AxOptimizerLoggerData = 
  | {
  name: "OptimizationStart";
  value: {
     config: Record<string, unknown>;
     exampleCount: number;
     optimizerType: string;
     validationCount: number;
  };
}
  | {
  name: "RoundProgress";
  value: {
     bestScore: number;
     configuration: Record<string, unknown>;
     currentScore: number;
     round: number;
     totalRounds: number;
  };
}
  | {
  name: "EarlyStopping";
  value: {
     finalScore: number;
     reason: string;
     round: number;
  };
}
  | {
  name: "OptimizationComplete";
  value: {
     bestConfiguration: Record<string, unknown>;
     bestScore: number;
     explanation?: string;
     optimizerType?: string;
     performanceAssessment?: string;
     recommendations?: string[];
     stats: AxOptimizationStats;
     successRate?: string;
     totalCalls?: number;
  };
}
  | {
  name: "ConfigurationProposal";
  value: {
     count: number;
     proposals: string[] | Record<string, unknown>[];
     type: "instructions" | "demos" | "general";
  };
}
  | {
  name: "BootstrappedDemos";
  value: {
     count: number;
     demos: unknown[];
  };
}
  | {
  name: "BestConfigFound";
  value: {
     config: Record<string, unknown>;
     score: number;
  };
};

Full reference

`AxOptimizerLoggerFunction`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxOptimizerLoggerFunction`
Returns	`void`
Source	source

Call Shape

TypeScript

type AxOptimizerLoggerFunction = (data: AxOptimizerLoggerData) => void;

Arguments And Options

Name	Type	Description
`data`	`AxOptimizerLoggerData`

Full reference

`AxOptimizerMetricsConfig`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxOptimizerMetricsConfig`
Source	source

Full reference

`AxOptimizerMetricsInstruments`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxOptimizerMetricsInstruments`
Source	source

Full reference

`AxOptimizerResult`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxOptimizerResult`
Source	source

Full reference

`AxParetoResult`

TypeScript interface exported by @ax-llm/ax. See the fields and full reference below.

Field	Value
Kind	`interface`
Form	`AxParetoResult`
Source	source

Full reference

`AxProgramDemos`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxProgramDemos`
Source	source

Call Shape

TypeScript

type AxProgramDemos<IN, OUT, ID> = object;

Full reference

`AxSerializedOptimizedProgram`

TypeScript typealias exported by @ax-llm/ax. See the full reference for complete details.

Field	Value
Kind	`typealias`
Form	`AxSerializedOptimizedProgram`
Source	source

Call Shape

TypeScript

type AxSerializedOptimizedProgram<OUT> = Omit<AxOptimizedProgram<OUT>, "applyTo">;

Full reference

`axSerializeOptimizedProgram`

TypeScript function exported by @ax-llm/ax. See the call shape, arguments, and full reference below.

Field	Value
Kind	`function`
Form	`axSerializeOptimizedProgram`
Returns	`AxSerializedOptimizedProgram`<`OUT`>
Source	source

Call Shape

TypeScript

function axSerializeOptimizedProgram<OUT>(optimizedProgram: Readonly<AxOptimizedProgram<OUT>>): AxSerializedOptimizedProgram<OUT>;

Arguments And Options

Name	Type	Description
`optimizedProgram`	`Readonly`<`AxOptimizedProgram`<`OUT`>>

Full reference

`axUpdateOptimizerMetricsConfig`

TypeScript function exported by @ax-llm/ax. See the call shape, arguments, and full reference below.

Field	Value
Kind	`function`
Form	`axUpdateOptimizerMetricsConfig`
Returns	`void`
Source	source

Call Shape

TypeScript

function axUpdateOptimizerMetricsConfig(config: Readonly<Partial<AxOptimizerMetricsConfig>>): void;

Arguments And Options

Name	Type	Description
`config`	`Readonly`<`Partial`<`AxOptimizerMetricsConfig`>>

Full reference

Full Reference

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