import type { BaseTool, ToolMetadata } from "@llamaindex/core/llms";
import type { BaseQueryEngine } from "@llamaindex/core/query-engine";
import type { JSONSchemaType } from "ajv";
export type QueryEngineToolParams = {
    queryEngine: BaseQueryEngine;
    metadata?: ToolMetadata<JSONSchemaType<QueryEngineParam>> | undefined;
    includeSourceNodes?: boolean;
};
export type QueryEngineParam = {
    query: string;
};
export declare class QueryEngineTool implements BaseTool<QueryEngineParam> {
    private queryEngine;
    metadata: ToolMetadata<JSONSchemaType<QueryEngineParam>>;
    includeSourceNodes: boolean;
    constructor({ queryEngine, metadata, includeSourceNodes, }: QueryEngineToolParams);
    call({ query }: QueryEngineParam): Promise<string | number | boolean | import("@llamaindex/core/global").JSONObject | import("@llamaindex/core/global").JSONArray | {
        content: import("@llamaindex/core/llms").MessageContent;
    }>;
}