/**
 * @license
 * Copyright 2026 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { BasePlugin } from '../plugins/base_plugin.js';
import { RunnableRoot } from '../workflow/run_node_as_invocation.js';
import { ResumabilityConfig } from './resumability_config.js';
/**
 * Ensures the provided application name is safe and intuitive.
 */
export declare function validateAppName(name: string): void;
/**
 * A unique symbol to identify ADK App classes.
 * Defined once and shared by all App instances.
 */
declare const APP_SIGNATURE_SYMBOL: unique symbol;
/**
 * Type guard to check if an object is an instance of App.
 * @param obj The object to check.
 * @returns True if the object is an instance of App, false otherwise.
 */
export declare function isApp(obj: unknown): obj is App;
/**
 * Options for initializing an App.
 */
export interface AppOptions {
    name: string;
    /**
     * The root of the application. A bare node — a `Workflow`, most usefully —
     * is accepted and adapted, so a graph does not have to be wrapped by hand to
     * be an app root. Accepts the same set a `Runner` does.
     */
    rootAgent: RunnableRoot;
    plugins?: BasePlugin[];
    resumabilityConfig?: ResumabilityConfig;
}
/**
 * Represents an LLM-backed agentic application.
 *
 * An `App` is the top-level container for an agentic system powered by LLMs.
 * It manages a root agent (`rootAgent`), which serves as the entry point for execution.
 *
 * Exactly one `rootAgent` must be provided.
 *
 * The `plugins` are application-wide components that provide shared capabilities
 * and services to the entire system.
 */
export declare class App {
    readonly [APP_SIGNATURE_SYMBOL] = true;
    readonly name: string;
    readonly rootAgent: RunnableRoot;
    readonly plugins: BasePlugin[];
    readonly resumabilityConfig?: ResumabilityConfig;
    constructor(options: AppOptions);
}
export {};