diff --git a/scripts/generate-manifest.js b/scripts/generate-manifest.js
index 720f5574..e0e6182c 100644
--- a/scripts/generate-manifest.js
+++ b/scripts/generate-manifest.js
@@ -177,4 +177,5 @@ if (require.main === module) {
 module.exports = {
   buildEntry,
   parseMetadataYaml,
+  listMetadataFiles,
 };
\ No newline at end of file
diff --git a/scripts/generate-manifest.test.js b/scripts/generate-manifest.test.js
index 2cc080a1..73ca6190 100644
--- a/scripts/generate-manifest.test.js
+++ b/scripts/generate-manifest.test.js
@@ -1,7 +1,69 @@
 const test = require('node:test');
 const assert = require('node:assert');
 const path = require('path');
-const { buildEntry, parseMetadataYaml } = require('./generate-manifest.js');
+const os = require('os');
+const fs = require('fs');
+const { buildEntry, parseMetadataYaml, listMetadataFiles } = require('./generate-manifest.js');
+
+test('listMetadataFiles', async (t) => {
+  let tmpDir;
+
+  t.beforeEach(() => {
+    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'metadata-test-'));
+  });
+
+  t.afterEach(() => {
+    fs.rmSync(tmpDir, { recursive: true, force: true });
+  });
+
+  await t.test('returns empty array for non-existent directory', () => {
+    const results = listMetadataFiles(path.join(tmpDir, 'non-existent'));
+    assert.deepStrictEqual(results, []);
+  });
+
+  await t.test('returns empty array when no metadata files exist', () => {
+    fs.writeFileSync(path.join(tmpDir, 'somefile.txt'), '');
+    const results = listMetadataFiles(tmpDir);
+    assert.deepStrictEqual(results, []);
+  });
+
+  await t.test('finds metadata.yaml in root directory', () => {
+    const yamlPath = path.join(tmpDir, 'metadata.yaml');
+    fs.writeFileSync(yamlPath, '');
+    const results = listMetadataFiles(tmpDir);
+    assert.deepStrictEqual(results, [yamlPath]);
+  });
+
+  await t.test('finds metadata.yaml in nested directories', () => {
+    const dir1 = path.join(tmpDir, 'dir1');
+    const dir2 = path.join(tmpDir, 'dir2');
+    fs.mkdirSync(dir1);
+    fs.mkdirSync(dir2);
+
+    const yaml1 = path.join(dir1, 'metadata.yaml');
+    const yaml2 = path.join(dir2, 'metadata.yaml');
+
+    fs.writeFileSync(yaml1, '');
+    fs.writeFileSync(yaml2, '');
+
+    const results = listMetadataFiles(tmpDir);
+    assert.strictEqual(results.length, 2);
+    assert.ok(results.includes(yaml1));
+    assert.ok(results.includes(yaml2));
+  });
+
+  await t.test('ignores other files named metadata.yaml if they are directories', () => {
+    const fakeYamlDir = path.join(tmpDir, 'metadata.yaml');
+    fs.mkdirSync(fakeYamlDir);
+
+    const realYaml = path.join(tmpDir, 'dir1', 'metadata.yaml');
+    fs.mkdirSync(path.join(tmpDir, 'dir1'));
+    fs.writeFileSync(realYaml, '');
+
+    const results = listMetadataFiles(tmpDir);
+    assert.deepStrictEqual(results, [realYaml]);
+  });
+});
 
 test('buildEntry', async (t) => {
   await t.test('handles a single model with full metadata', () => {
diff --git a/scripts/validate-metadata.test.js b/scripts/validate-metadata.test.js
index 409cc82b..9d05cf62 100644
--- a/scripts/validate-metadata.test.js
+++ b/scripts/validate-metadata.test.js
@@ -327,3 +327,11 @@ test('setNested', async (t) => {
     assert.deepStrictEqual(obj, {});
   });
 });
+
+test('listMetadataFiles', async (t) => {
+  await t.test('returns empty array for non-existent directory', () => {
+    const nonExistentPath = '/path/that/does/not/exist/for/sure/12345';
+    const result = listMetadataFiles(nonExistentPath);
+    assert.deepStrictEqual(result, []);
+  });
+});