import { Message } from './history.js';
/**
 * A summary of a chunk of conversation messages.
 */
export interface Summary {
    id: string;
    fromIndex: number;
    toIndex: number;
    generatedAt: number;
    content: string;
    topics: string[];
}
/**
 * The full summary file structure for a thread.
 */
export interface SummaryFile {
    threadId: string;
    lastMessageIndex: number;
    summaries: Summary[];
    sessionSummary?: string;
    updatedAt: number;
}
/**
 * Result from get_summary tool.
 */
export interface GetSummaryResult {
    summary: string;
    coversMessages: {
        from: number;
        to: number;
    };
    topics: string[];
    generatedAt?: number;
}
/**
 * Get the summary file path for a thread.
 */
export declare function getSummaryPath(threadPath: string): string;
/**
 * Load existing summaries for a thread.
 */
export declare function loadSummaries(threadPath: string): Promise<SummaryFile | null>;
/**
 * Save summaries to file.
 */
export declare function saveSummaries(summaryFile: SummaryFile, threadPath: string): Promise<void>;
/**
 * Check if summarization should be triggered.
 */
export declare function shouldSummarize(lastSummaryIndex: number, currentIndex: number, estimatedTokens?: number): boolean;
/**
 * Generate a summary for a chunk of messages using sub_query.
 */
export declare function generateChunkSummary(messages: Message[], fromIndex: number, toIndex: number, subQueryFn: (prompt: string, context: string) => Promise<string>): Promise<Summary>;
/**
 * Generate a high-level session summary from multiple chunk summaries.
 */
export declare function generateSessionSummary(chunks: Summary[], subQueryFn: (prompt: string, context: string) => Promise<string>): Promise<string>;
/**
 * Run summarization for a thread if needed.
 */
export declare function runSummarization(threadPath: string, messages: Message[], subQueryFn: (prompt: string, context: string) => Promise<string>): Promise<void>;
/**
 * Get summary based on scope.
 */
export declare function getSummary(threadPath: string, scope?: 'recent' | 'full' | 'range', startIndex?: number, endIndex?: number): Promise<GetSummaryResult | null>;
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