diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..bccfbe1
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,22 @@
+# SPDX-FileCopyrightText: Copyright (c) 2026 APN.
+# SPDX-License-Identifier: MIT.
+
+name: ci
+on:
+  pull_request:
+    branches: [master]
+  push:
+    branches: [master]
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: bufbuild/buf-setup-action@v1
+      - run: buf lint
+  breaking:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: bufbuild/buf-setup-action@v1
+      - run: buf breaking --against '.git#branch=master'
diff --git a/buf.yaml b/buf.yaml
new file mode 100644
index 0000000..43dfc33
--- /dev/null
+++ b/buf.yaml
@@ -0,0 +1,13 @@
+version: v2
+lint:
+  use:
+    - STANDARD
+  except:
+    - ENUM_VALUE_PREFIX
+    - ENUM_ZERO_VALUE_SUFFIX
+    - FIELD_NOT_REQUIRED
+    - PACKAGE_DIRECTORY_MATCH
+    - PACKAGE_VERSION_SUFFIX
+breaking:
+  use:
+    - FILE