import type { UserUnderstanding } from './domain.js';
export interface RelationshipFollowUpRequest {
    subject: string;
    validFrom?: number;
}
export declare function extractExplicitRelationshipFollowUp(message: string, nowMs?: number): RelationshipFollowUpRequest | null;
export declare function recordExplicitRelationshipFollowUp(input: {
    sessionKey: string;
    message: string;
    nowMs?: number;
}): UserUnderstanding | null;