diff --git a/packages/sample/genaisrc/pr-describe.genai.mjs b/packages/sample/genaisrc/pr-describe.genai.mjs
index 85f551cb1..5fffb1bd4 100644
--- a/packages/sample/genaisrc/pr-describe.genai.mjs
+++ b/packages/sample/genaisrc/pr-describe.genai.mjs
@@ -1,7 +1,13 @@
 script({
     temperature: 1,
     title: "pr-describe",
-    system: ["system", "system.fs_find_files", "system.fs_read_file"],
+    system: [
+        "system",
+        "system.output_markdown",
+        "system.assistant",
+        "system.fs_find_files",
+        "system.fs_read_file",
+    ],
     parameters: {
         defaultBranch: {
             type: "string",