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chore: sync core lib and CLAUDE.md from agent-core #20

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Merged
avifenesh merged 1 commit into from
Apr 26, 2026
Merged

chore: sync core lib and CLAUDE.md from agent-core #20

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14 changes: 10 additions & 4 deletions lib/cross-platform/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -303,15 +303,21 @@ function formatSection(title, content) {
*/

/**
* Truncate text to limit with ellipsis
* Truncate text to limit with ellipsis.
*
* Slices on Unicode code points (not UTF-16 code units) so multi-byte
* chars like emoji never end up as orphan surrogates. Non-positive
* maxLength returns the original string unchanged.
*
* @param {string} text - Text to truncate
* @param {number} maxLength - Maximum length
* @param {number} maxLength - Maximum length (in code points)
* @returns {string} Truncated text
*/
function truncate(text, maxLength) {
if (text.length <= maxLength) return text;
return text.substring(0, maxLength - 3) + '...';
if (maxLength <= 0) return text;
const codePoints = [...text];
if (codePoints.length <= maxLength) return text;
return codePoints.slice(0, maxLength - 3).join('') + '...';
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@cursor cursor Bot Apr 26, 2026

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Negative slice end produces oversized output

Medium Severity

The truncate function doesn't correctly truncate when maxLength is 1 or 2. When maxLength - 3 is negative, Array.prototype.slice treats it as an offset from the end of the array, unlike String.prototype.substring. This returns nearly the entire original string plus an ellipsis, violating the truncation contract.

Fix in Cursor Fix in Web

Reviewed by Cursor Bugbot for commit 01d7166. Configure here.

}

/**
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