import { z } from 'zod';
import { ChatHistory } from '../../types/types';
import { StructuredToolInterface } from '@langchain/core/tools';
import { AIMessage } from '@langchain/core/messages';
import { ChatModelTier } from '../../models/types';
type BaseOptions = {
    promptText: string;
    modelTier?: ChatModelTier;
    temperature?: number;
    messages?: ChatHistory;
    inputVariables?: Record<string, unknown>;
};
/**
 * Invokes a prompt and returns a plain text response.
 * Use this when you just need free-form text from the model.
 */
export declare const invokeTextPrompt: (opts: BaseOptions) => Promise<string>;
/**
 * Invokes a prompt and returns structured data validated against a schema.
 * Use this when you need a predictable, typed result.
 */
export declare const invokeStructuredPrompt: <T>(opts: BaseOptions & {
    schema: z.ZodType<T>;
}) => Promise<T>;
/**
 * Invokes a prompt with tools enabled and returns the model’s tool call response.
 * Use this when the model needs to decide whether to call a tool.
 */
export declare const invokeToolPrompt: (opts: BaseOptions & {
    tools: StructuredToolInterface[];
}) => Promise<AIMessage>;
export {};