import type { ONIModelMessage } from "../models/types.js";
import type { DefineAgentOptions, AgentNode } from "./types.js";
/**
 * defineAgent — create a declarative ReAct agent
 *
 * The returned AgentNode._nodeFn is suitable for use as a graph node.
 * It expects the state to have an optional `messages` field (ONIModelMessage[])
 * and returns `{ messages }` with the conversation appended.
 */
export declare function defineAgent<S extends {
    messages?: ONIModelMessage[];
} & Record<string, unknown> = Record<string, unknown>>(opts: DefineAgentOptions): AgentNode<S>;
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