diff --git a/frontend/scene-generator/generator-runner.js b/frontend/scene-generator/generator-runner.js
index 91f8165..1e727b1 100644
--- a/frontend/scene-generator/generator-runner.js
+++ b/frontend/scene-generator/generator-runner.js
@@ -29,12 +29,11 @@ function runGenerator(params, sseWriter, projectRoot) {
     args.push("--target-url", targetUrl);
   }
 
-  args.push(
-    "--output-root",
-    normalize(outputRoot),
-    "--lessons",
-    normalize(lessons)
-  );
+  args.push("--output-root", normalize(outputRoot));
+
+  if (lessons) {
+    args.push("--lessons", normalize(lessons));
+  }
 
   return new Promise((resolve, reject) => {
     sseWriter.write(
@@ -170,6 +169,12 @@ function readDirectory(sourceDir) {
     result["SKILL.md"] = fs.readFileSync(skillMdPath, "utf-8");
   }
 
+  // Read index.html
+  const indexHtmlPath = p.join(sourceDir, "index.html");
+  if (fs.existsSync(indexHtmlPath)) {
+    result.indexHtml = fs.readFileSync(indexHtmlPath, "utf-8");
+  }
+
   const scripts = {};
   for (const entry of entries) {
     if (entry.isFile() && entry.name.endsWith(".js")) {