diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..fe9a32a
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,44 @@
+name: CI
+
+on:
+  pull_request:
+    paths-ignore:
+      - '**/*.md'
+      - 'docs/**'
+      - '.claude/**'
+      - '.vscode/**'
+      - 'LICENSE'
+      - '.gitignore'
+  push:
+    branches: [main]
+    paths-ignore:
+      - '**/*.md'
+      - 'docs/**'
+      - '.claude/**'
+      - '.vscode/**'
+      - 'LICENSE'
+      - '.gitignore'
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+
+      - uses: actions/setup-node@v7
+        with:
+          node-version-file: .nvmrc
+          cache: npm
+
+      - run: npm ci
+      - run: npm run typecheck
+      - run: npm run lint
+      - run: npm test
+      - run: npm run build