diff --git a/.gitea/workflows/deploy.yml b/.gitea/workflows/deploy.yml
index 861e640..32ca473 100644
--- a/.gitea/workflows/deploy.yml
+++ b/.gitea/workflows/deploy.yml
@@ -5,7 +5,7 @@ on:
   pull_request:
 concurrency:
   group: rice-pk-xhs-production
-  cancel-in-progress: false
+  cancel-in-progress: true
 jobs:
   verify-deploy:
     runs-on: ubuntu-latest
@@ -22,7 +22,7 @@ jobs:
         env: { SOURCE_TOKEN: "${{ secrets.GITEA_TOKEN || gitea.token }}" }
         run: |
           set -eu
-          apk add --no-cache python3 nodejs npm curl
+          apk add --no-cache python3 curl
           python3 - <<'PY'
           import io,os,shutil,tarfile,tempfile,urllib.request
           from pathlib import Path
@@ -34,7 +34,7 @@ jobs:
               roots=list(Path(d).iterdir());shutil.copytree(roots[0],Path.cwd(),dirs_exist_ok=True)
           PY
       - name: Check source and preview
-        run: npm run check
+        run: python3 scripts/check.py
       - name: Build preview image
         run: docker build -t "rice-pk-xhs:$SOURCE_REVISION" .
       - name: Update permanent preview container
diff --git a/scripts/check.py b/scripts/check.py
new file mode 100644
index 0000000..dedf7e1
--- /dev/null
+++ b/scripts/check.py
@@ -0,0 +1,18 @@
+import json
+from pathlib import Path
+
+required = [
+    "app.js",
+    "app.json",
+    "pages/index/index.xhsml",
+    "pages/test/test.js",
+    "pages/result/result.js",
+    "web/index.html",
+    "web/app.js",
+]
+missing = [name for name in required if not Path(name).is_file()]
+if missing:
+    raise SystemExit("Missing required files: " + ", ".join(missing))
+
+json.loads(Path("app.json").read_text())
+print(f"Static checks passed ({len(required)} required files).")