export type AnswerStatus = "answered" | "already" | "not-found" | "no-live-target" | "invalid";
export interface AnswerResult {
    readonly status: AnswerStatus;
    readonly decisionId: string;
    readonly answerId?: string;
    readonly envelopeId?: string;
    readonly targetInstance?: string;
    readonly reason?: string;
}
export interface PostAnswerDeps {
    readonly now: number;
    readonly envelopeId: string;
}
/** True if a reply was already recorded for this decision (idempotence). */
export declare function hasAlreadyAnswered(root: string, decisionId: string): boolean;
export declare function postDecisionAnswer(root: string, input: {
    decisionId: string;
    answerId: string;
    note?: string;
}, deps: PostAnswerDeps): AnswerResult;
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