diff --git a/packages/cli/src/config/extension.test.ts b/packages/cli/src/config/extension.test.ts
index 3243aff0d5..7f0e4e2f02 100644
--- a/packages/cli/src/config/extension.test.ts
+++ b/packages/cli/src/config/extension.test.ts
@@ -309,6 +309,9 @@ describe('extension tests', () => {
       expect(extensions[0].mcpServers?.['test-server'].cwd).toBe(
         path.join(sourceExtDir, 'server'),
       );
+      expect(extensions[0].mcpServers?.['test-server'].args).toEqual([
+        path.join(sourceExtDir, 'server', 'index.js'),
+      ]);
     });
 
     it('should resolve environment variables in extension configuration', () => {