import type { ChatActor, ChatMessage, ChatScope, ChatThread } from "./types/chat.js";
export type ChatContinuityStatus = "active" | "fallback_history_replay" | "stale_stream";
export interface ChatContinuityMeta {
    status: ChatContinuityStatus;
    threadId: string;
    scopeSessionId: string;
    actorSessionId?: string;
    historyMessageCount: number;
    fallbackHistoryLimit: number;
    fallbackHistoryReplayed: boolean;
    provenance: "stored_chat_history";
    lastMessageId?: string;
    lastSequence?: number;
    expectedLastMessageId?: string;
    expectedLastSequence?: number;
    retainedMessageIds: string[];
    warnings: string[];
}
export interface ChatContinuityInput {
    scope: ChatScope;
    thread: ChatThread;
    messages: ChatMessage[];
    actor?: ChatActor;
    expectedLastMessageId?: string;
    expectedLastSequence?: number;
    fallbackHistoryLimit?: number;
}
export declare function evaluateChatContinuity(input: ChatContinuityInput): ChatContinuityMeta;