diff --git a/tests/test_compose_contract.py b/tests/test_compose_contract.py
index 8eaf3b6..f2c39a6 100644
--- a/tests/test_compose_contract.py
+++ b/tests/test_compose_contract.py
@@ -16,16 +16,6 @@ COMPOSE_FILE = ROOT / "compose.yaml"
 DOCKERFILE = ROOT / "Dockerfile"
 COMPOSE_BIN = os.environ.get("COMPOSE_BIN", "/opt/data/tmp/docker-compose-birweb")
 SYNTHETIC_RESOURCE_UUID = "contract-test-resource"
-
-ROUTER_PRIORITY_LABELS = {
-    f"traefik.http.routers.http-0-{SYNTHETIC_RESOURCE_UUID}-site.priority": "500",
-    f"traefik.http.routers.https-0-{SYNTHETIC_RESOURCE_UUID}-site.priority": "500",
-}
-SOURCE_ROUTER_PRIORITY_TEMPLATES = {
-    "traefik.http.routers.http-0-${UUID}-site.priority=500",
-    "traefik.http.routers.https-0-${UUID}-site.priority=500",
-}
-
 DOCKERFILE_SHA256 = "748bd362b43475779d241074a1955ae880967c923a7f68c693cb1c67f8b242dd"
 BASE_IMAGE = (
     "nginxinc/nginx-unprivileged:1.27-alpine@"
@@ -176,44 +166,33 @@ class ComposeContract(unittest.TestCase):
         self.assertGreaterEqual(memory, 16 * 1024**2)
         self.assertLessEqual(memory, 512 * 1024**2)
 
-    def test_rendered_traefik_router_priorities_are_exact(self) -> None:
-        rendered_labels = self.service().get("labels")
-        self.assertIsInstance(rendered_labels, dict)
-        labels = rendered_labels if isinstance(rendered_labels, dict) else {}
-        self.assertEqual(labels, ROUTER_PRIORITY_LABELS)
-        self.assertTrue(all(isinstance(value, str) for value in labels.values()))
-
-    def test_priority_labels_use_source_list_syntax_and_uuid_interpolation(self) -> None:
-        source_label_items = {
-            match.group(1)
+    def test_source_defines_no_traefik_labels(self) -> None:
+        source_label_names = {
+            match.group(1).strip("'\"")
             for match in re.finditer(
-                r'^\s*-\s*["\']?(traefik\.(?:http\.)?[^"\']+?)["\']?\s*$',
+                r'^\s*-\s*([^\s=]+)(?:=.*)?$',
                 self.source,
-                re.MULTILINE,
+                re.IGNORECASE | re.MULTILINE,
             )
         }
-        required_interpolation = re.compile(
-            r"\$\{COOLIFY_RESOURCE_UUID:\?[^}\r\n]+\}"
-        )
-        normalized_items = {
-            required_interpolation.sub("${UUID}", item)
-            for item in source_label_items
-        }
-        self.assertEqual(normalized_items, SOURCE_ROUTER_PRIORITY_TEMPLATES)
-        self.assertTrue(
-            all(required_interpolation.search(item) for item in source_label_items),
-            "each Traefik label must use required COOLIFY_RESOURCE_UUID interpolation",
-        )
-        self.assertNotIn(SYNTHETIC_RESOURCE_UUID, self.source)
-
-        mapping_labels = [
-            (key, line)
+        source_label_names.update(
+            key
             for _, key, line in source_mapping_keys(self.source)
-            if key.startswith("traefik.")
-        ]
-        self.assertEqual(mapping_labels, [], "Traefik labels must use Compose list syntax")
+        )
+        traefik_labels = sorted(
+            name
+            for name in source_label_names
+            if re.search(r"(?:^|[._-])traefik(?:[._-]|$)", name, re.IGNORECASE)
+        )
+        # Interpolating a label key is unsafe: Coolify preprocesses list labels
+        # into a mapping before Compose interpolation, leaving that key literal.
+        self.assertEqual(
+            traefik_labels,
+            [],
+            f"source Traefik labels are forbidden; Coolify owns them: {traefik_labels}",
+        )
 
-    def test_resource_uuid_interpolation_fails_closed_when_missing_or_empty(self) -> None:
+    def test_compose_renders_without_resource_uuid(self) -> None:
         missing_env = os.environ.copy()
         missing_env.pop("COOLIFY_RESOURCE_UUID", None)
         empty_env = os.environ.copy()
@@ -222,12 +201,11 @@ class ComposeContract(unittest.TestCase):
         for case, env in (("missing", missing_env), ("empty", empty_env)):
             with self.subTest(case=case):
                 rendered = run(self.render_command, env=env)
-                self.assertNotEqual(
+                self.assertEqual(
                     rendered.returncode,
                     0,
-                    f"Compose config accepted a {case} COOLIFY_RESOURCE_UUID",
+                    f"Compose config rejected a {case} COOLIFY_RESOURCE_UUID:\n{rendered.stderr}",
                 )
-                self.assertIn("COOLIFY_RESOURCE_UUID", rendered.stderr)
 
     def test_no_secrets_bind_mounts_or_forbidden_source_keys(self) -> None:
         service = self.service()