diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..e08e8ba
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+concurrency:
+  group: ci-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  check:
+    if: github.event.pull_request.draft == false
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Run Detekt
+        run: ./gradlew detekt
+
+      - name: Build shared module
+        run: ./gradlew :shared:compileAndroidMain
+
+      - name: Run shared tests
+        run: ./gradlew :shared:allTests
+
+      - name: Build Android debug APK
+        run: ./gradlew :composeApp:assembleDebug
diff --git a/CLAUDE.md b/CLAUDE.md
index e290944..431cff1 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -13,13 +13,13 @@ Worn is a Kotlin Multiplatform wardrobe manager app for Android and iOS. Users c
 ./gradlew :composeApp:assembleDebug
 
 # Build shared module
-./gradlew :shared:compileKotlinAndroid
+./gradlew :shared:compileAndroidMain
 
 # Run all shared tests
 ./gradlew :shared:allTests
 
 # Run a single test class
-./gradlew :shared:testDebugUnitTest --tests "com.github.worn.repository.WardrobeRepositoryTest"
+./gradlew :shared:allTests --tests "com.github.worn.repository.WardrobeRepositoryTest"
 
 # Check dependency resolution
 ./gradlew :shared:dependencies