import type { Agent, FunctionTool, RunResult } from '@openai/agents-core';
export interface AgentAsToolOptions<TAgent extends Agent<any, any>> {
    toolName: string;
    toolDescription?: string;
    customOutputExtractor?: (result: RunResult<any, TAgent>) => string | Promise<string>;
}
/**
 * Nested approval interruptions are not supported: `invoke` throws
 * `ApplicationFailure` of type `NestedAgentInterruption`. Handle approvals
 * at the top-level runner instead.
 */
export declare function agentAsTool<TAgent extends Agent<any, any>>(agent: TAgent, options: AgentAsToolOptions<TAgent>): FunctionTool;
export declare function extractToolOutput<TAgent extends Agent<any, any>>(result: RunResult<any, TAgent>, agentName: string, options: AgentAsToolOptions<TAgent>): Promise<string>;