import { ToolCall } from "../messages/tool.js";
export declare function _isToolCall(toolCall?: unknown): toolCall is ToolCall;
/**
 * Custom error class used to handle exceptions related to tool input parsing.
 * It extends the built-in `Error` class and adds an optional `output`
 * property that can hold the output that caused the exception.
 */
export declare class ToolInputParsingException extends Error {
    output?: string;
    constructor(message: string, output?: string);
}