/**
 * Tool output summarization — truncates large outputs to preserve context window.
 */
/**
 * Check if output exceeds the summarization threshold.
 */
export declare function shouldSummarize(output: string, maxChars?: number): boolean;
/**
 * Truncate output keeping first and last portions with a marker in between.
 */
export declare function truncateWithContext(output: string, maxChars?: number): string;
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