/**
 * Leaper Agent – Session Search Tool
 * Search across conversation history with fuzzy matching and relevance scoring.
 */
import type { ToolDefinition } from './registry.js';
export interface SessionRecord {
    session_id: string;
    title?: string;
    summary?: string;
    created_at: string;
    updated_at: string;
    message_count: number;
    tags?: string[];
}
export interface SearchHit {
    session_id: string;
    title?: string;
    snippet: string;
    score: number;
    created_at: string;
}
export interface SessionSearchOptions {
    query: string;
    limit?: number;
    offset?: number;
    date_from?: string;
    date_to?: string;
    recent_only?: boolean;
}
export interface SessionSearchResult {
    success: boolean;
    hits?: SearchHit[];
    total?: number;
    query?: string;
    error?: string;
}
export interface SessionBackend {
    search(query: string, limit: number): SessionRecord[];
    getRecent(limit: number): SessionRecord[];
}
export declare function setSessionBackend(backend: SessionBackend): void;
export declare function getSessionBackend(): SessionBackend;
export declare function extractSnippet(text: string, query: string, maxLen?: number): string;
export declare function scoreHit(record: SessionRecord, query: string): number;
export declare function searchSessions(opts: SessionSearchOptions): SessionSearchResult;
export declare const sessionSearchTool: ToolDefinition;
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