/**
 * A tool handler's error response, raised as an exception.
 *
 * `executeToolCall` converts any `isError` response into one of these, so every
 * caller downstream of it sees tool failures as throws. Kept in its own module
 * so tests can construct the real thing: a hand-rolled stand-in drifts from the
 * `response` it carries, and code that classifies failures reads that response
 * (`_errorId` above all).
 */
export declare class ToolError extends Error {
    response: any;
    constructor(response: any);
}
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