/** Pure diagnostic advice only; never rewrites code, retries, or changes backend policy.
 * Returns at most 900 characters, or undefined when no specific repair is known.
 * The caller owns appending this once, and should call only for runtime errors.
 */
export declare function pythonErrorRecoveryHint(code: string, error: string, backend: "monty" | "cpython"): string | undefined;
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