diff --git a/.github/workflows/style.yml b/.github/workflows/style.yml
new file mode 100644
index 0000000..ab9fc31
--- /dev/null
+++ b/.github/workflows/style.yml
@@ -0,0 +1,16 @@
+# The mechanical house-style rules: SPDX header, no Sphinx roles in
+# docstrings, no link to the .github repo from a page, no README badges or
+# status banner. Pull requests check the changed files; a manual run checks
+# every file. Paths that aren't ours go in .style-exclude.
+name: Style
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  style:
+    uses: PyDevices/.github/.github/workflows/reusable-style-check.yml@publishing-v20
diff --git a/.style-exclude b/.style-exclude
new file mode 100644
index 0000000..cd28c64
--- /dev/null
+++ b/.style-exclude
@@ -0,0 +1,5 @@
+# Paths the style check skips: code that isn't ours, and generated files.
+# One glob per line.
+
+# Written by apps/ostinato/scripts/make_icon_font.py.
+apps/ostinato/app/ui/icons.py
diff --git a/manifest.py b/manifest.py
index 1ffc43e..3c384d0 100644
--- a/manifest.py
+++ b/manifest.py
@@ -1,4 +1,5 @@
 # SPDX-FileCopyrightText: 2026 Brad Barnett
+#
 # SPDX-License-Identifier: MIT
 """applibs as a MicroPython manifest: freeze every shared library in lib/.