Codex vs Claude Code: choose a developer workflow

mkdir agent-review-demo
cd agent-review-demo
cat > label.mjs <<'JS'
export function normalizeLabel(value) {
  return value.trim().toLowerCase();
}
JS
cat > label.test.mjs <<'JS'
import test from 'node:test';
import assert from 'node:assert/strict';
import { normalizeLabel } from './label.mjs';

test('trims and lowercases', () => {
  assert.equal(normalizeLabel('  HELLO  '), 'hello');
});
test('replaces internal whitespace with a hyphen', () => {
  assert.equal(normalizeLabel('Hello   World'), 'hello-world');
});
JS
node --test label.test.mjs

Review label.mjs and label.test.mjs. Do not edit files,
install packages, delegate work, or contact external services.

Contract: accept strings, trim the edges, lowercase,
and replace each internal run of whitespace with one hyphen.

Identify the concrete defect, explain the failing assertion,
and propose a minimal patch as text. Separate observations
from any test results you actually ran.

return value.trim().toLowerCase().replace(/\s+/g, '-');