import { type LanguageModel, type TimeoutConfiguration, type Tool, type ToolSet } from 'ai';
import { z } from 'zod';
import type { AgentDefinition } from './agents-loader.ts';
export type AgentToolSpec = Pick<AgentDefinition, 'name' | 'description' | 'systemPrompt'>;
export type AgentToolOptions = {
    model: LanguageModel;
    tools: ToolSet;
    allowedTools: readonly string[];
    maxSteps?: number;
    maxDepth?: number;
    maxOutputChars?: number;
    timeout?: TimeoutConfiguration;
    onUsage?: (usage: import('ai').LanguageModelUsage, modelId: string | undefined, providerMetadata?: import('ai').ProviderMetadata) => void;
};
export declare const DEFAULT_AGENT_TOOL_MAX_STEPS = 15;
export declare const DEFAULT_AGENT_TOOL_MAX_OUTPUT_CHARS = 4000;
export declare const AGENT_TOOL_TRUNCATION_MARKER = "\n\n[output truncated]";
export declare const AGENT_TOOL_NO_CONCLUSION = "(no conclusion: the survey ended without a final answer)";
export declare const AGENT_TOOL_ERROR_PREFIX = "survey failed: ";
export declare const DEFAULT_AGENT_TOOL_MAX_DEPTH = 1;
export declare const AGENT_TOOL_DEPTH_EXCEEDED_PREFIX = "survey refused: subagent depth cap reached";
export declare class AgentToolConstructionError extends Error {
    readonly name = "AgentToolConstructionError";
}
declare const agentToolInputSchema: z.ZodObject<{
    prompt: z.ZodString;
}, z.core.$strip>;
export type AgentToolInput = z.infer<typeof agentToolInputSchema>;
export declare function makeAgentTool(spec: AgentToolSpec, opts: AgentToolOptions): Tool<AgentToolInput, string>;
export {};