diff --git a/scripts/validate.mjs b/scripts/validate.mjs
index 512b85a..0ef144d 100644
--- a/scripts/validate.mjs
+++ b/scripts/validate.mjs
@@ -178,10 +178,7 @@ export function run(args = process.argv.slice(2)) {
     ]);
     validateCatalog(catalog, games, stubs);
     mkdirSync(path.join(root, '.release'), { recursive: true });
-    // The engine reference reader rejects unknown fields, so the index carries exactly the five
-    // row fields it declares; rating, genre and kind stay in data/catalog.json.
-    const rows = catalog.map(({ id, title, platform, repo: source, tier }) => ({ id, title, platform, repo: source, tier }));
-    writeFileSync(path.join(root, '.release', 'index.json.gz'), gzipSync(JSON.stringify({ version: 1, games: rows, stubs })));
+    writeFileSync(path.join(root, '.release', 'index.json.gz'), gzipSync(JSON.stringify({ version: 1, games: catalog, stubs })));
     for (const game of games) writeFileSync(path.join(root, '.release', `game-${game.id}.json`), JSON.stringify(game));
   }
 }
diff --git a/tests/library.spec.mjs b/tests/library.spec.mjs
index 0927120..f15de9f 100644
--- a/tests/library.spec.mjs
+++ b/tests/library.spec.mjs
@@ -142,7 +142,7 @@ test('release assets keep the version-1 contract and exact asset set', t => {
   assert.deepEqual(readdirSync(path.join(dir, '.release')).sort(), ['game-demo.json', 'game-second.json', 'index.json.gz']);
   const index = JSON.parse(gunzipSync(readFileSync(path.join(dir, '.release', 'index.json.gz'))).toString());
   assert.equal(index.version, 1);
-  assert.deepEqual(index.games, config.map(({ id, title, platform, repo, tier }) => ({ id, title, platform, repo, tier })));
+  assert.deepEqual(index.games, config);
   const game = demoGame(source.sha);
   assert.equal(readFileSync(path.join(dir, '.release', 'game-demo.json'), 'utf8'), JSON.stringify(game));
   assert.doesNotThrow(() => validateGame(JSON.parse(readFileSync(path.join(dir, '.release', 'game-demo.json'), 'utf8'))));