diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..4a29d4d
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,73 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [ main ]
+  push:
+    branches: [ main ]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install black nox
+      - name: Run lint
+        run: nox -s lint
+
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install nox
+      - name: Run tests
+        run: nox -s tests-${{ matrix.python-version }}
+
+  smoke-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install nox .
+      - name: Run smoke tests
+        run: nox -s smoke_tests
+
+  llm-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install nox . google-genai
+      - name: Run LLM tests
+        env:
+          GEMINI_API_KEY: ${{ secrets.GEMINI_API_KEY }}
+        run: nox -s llm_tests
diff --git a/ads_mcp/utils.py b/ads_mcp/utils.py
index 2cdd939..497fa11 100644
--- a/ads_mcp/utils.py
+++ b/ads_mcp/utils.py
@@ -62,8 +62,6 @@ def _get_login_customer_id() -> str | None:
 
 
 def _get_googleads_client() -> GoogleAdsClient:
-    # Use this line if you have a google-ads.yaml file
-    # client = GoogleAdsClient.load_from_storage()
     args = {
         "credentials": _create_credentials(),
         "developer_token": _get_developer_token(),
@@ -80,21 +78,18 @@ def _get_googleads_client() -> GoogleAdsClient:
     return client
 
 
-_googleads_client = _get_googleads_client()
-
-
 def get_googleads_service(serviceName: str) -> GoogleAdsServiceClient:
-    return _googleads_client.get_service(
+    return _get_googleads_client().get_service(
         serviceName, interceptors=[MCPHeaderInterceptor()]
     )
 
 
 def get_googleads_type(typeName: str):
-    return _googleads_client.get_type(typeName)
+    return _get_googleads_client().get_type(typeName)
 
 
 def get_googleads_client():
-    return _googleads_client
+    return _get_googleads_client()
 
 
 def format_output_value(value: Any) -> Any:
diff --git a/tests/utils_test.py b/tests/utils_test.py
index c0737a2..d0cc507 100644
--- a/tests/utils_test.py
+++ b/tests/utils_test.py
@@ -28,7 +28,6 @@ class TestUtils(unittest.TestCase):
     def test_format_output_value(self):
         """Tests that output values are formatted correctly."""
 
-        client = utils.get_googleads_client()
         self.assertEqual(
             utils.format_output_value(
                 CampaignStatusEnum.CampaignStatus.ENABLED