export declare const QUESTION_INTAKE_CONTROL_VARIANT: "control";
export declare const QUESTION_INTAKE_TREATMENT_VARIANT: "no_questions";
export interface QuestionIntakeExperimentConfig {
    enabled: boolean;
    disabled?: boolean;
    experimentId: string;
    questionToolNames: string[];
    treatmentInstructions: string;
    trackedEventNames: string[];
    clientTrackedEventNames?: string[];
}
export interface QuestionIntakeExperimentAssignment {
    authUserId: string;
    experimentId: string;
    variantId: typeof QUESTION_INTAKE_CONTROL_VARIANT | typeof QUESTION_INTAKE_TREATMENT_VARIANT;
}
export declare function questionIntakeExposureProperties(assignment: QuestionIntakeExperimentAssignment, context: {
    appId: string;
    threadId?: string;
    turnId: string;
}): Record<string, string>;
export declare class QuestionIntakeAssignmentError extends Error {
    readonly code = "question_intake_assignment_failed";
    constructor(experimentId: string, cause: unknown);
}
export declare class InvalidQuestionIntakeExperimentAssignmentError extends Error {
    readonly code = "question_intake_assignment_invalid";
    constructor(experimentId: string);
}
export declare function treatmentInstructionsForQuestionIntake(config: QuestionIntakeExperimentConfig | undefined, assignment: QuestionIntakeExperimentAssignment | null): string | undefined;
/** Assigns only from the user-create hook while the app config is enabled. */
export declare function assignQuestionIntakeExperimentOnSignup(config: QuestionIntakeExperimentConfig | undefined, authUserId: string | undefined): Promise<QuestionIntakeExperimentAssignment | null>;
/** Reads an existing signup assignment; agent runs never enroll older users. */
export declare function resolveQuestionIntakeExperimentAssignment(config: QuestionIntakeExperimentConfig | undefined, authUserId: string | undefined): Promise<QuestionIntakeExperimentAssignment | null>;