diff --git a/server.py b/server.py
index c59b63e..5824795 100644
--- a/server.py
+++ b/server.py
@@ -44,7 +44,6 @@ from starlette.templating import Jinja2Templates
 
 # Import core modules
 from core import (
-    EventType,
     LogLevel,
     ToolGenerator,
     get_api_key_manager,
@@ -4258,10 +4257,7 @@ def create_multi_endpoint_app(transport: str = "streamable-http"):
                 pass
 
             # 4. Master API key (fallback — no distinguishing prefix)
-            if auth_manager.validate_master_key(token):
-                return True
-
-            return False
+            return bool(auth_manager.validate_master_key(token))
 
     class DashboardCSRFMiddleware(BaseHTTPMiddleware):
         """
diff --git a/tests/test_dynamic_endpoints_integration.py b/tests/test_dynamic_endpoints_integration.py
index 10c0525..1185674 100644
--- a/tests/test_dynamic_endpoints_integration.py
+++ b/tests/test_dynamic_endpoints_integration.py
@@ -3,12 +3,11 @@ Integration tests for the per-user dynamic MCP endpoints.
 Uses Starlette TestClient to simulate real HTTP requests through the server.
 """
 
-import pytest
-from starlette.testclient import TestClient
-from unittest.mock import patch, MagicMock, AsyncMock
-import json
+from unittest.mock import AsyncMock, MagicMock, patch
 
+import pytest
 from server import create_multi_endpoint_app
+from starlette.testclient import TestClient
 
 app = create_multi_endpoint_app()
 client = TestClient(app)
diff --git a/tests/test_site_api.py b/tests/test_site_api.py
index ae19157..6733c8c 100644
--- a/tests/test_site_api.py
+++ b/tests/test_site_api.py
@@ -2,7 +2,6 @@
 
 from unittest.mock import AsyncMock, MagicMock, patch
 
-import aiohttp
 import pytest
 
 from core.site_api import (
diff --git a/tests/test_tenant_isolation.py b/tests/test_tenant_isolation.py
index 6fc7451..c653229 100644
--- a/tests/test_tenant_isolation.py
+++ b/tests/test_tenant_isolation.py
@@ -1,8 +1,9 @@
 """Tests for tenant isolation in Dashboard routes."""
 
 import pytest
+
 from core.dashboard.routes import get_all_projects
-from core.site_manager import SiteManager, SiteConfig
+from core.site_manager import SiteConfig, SiteManager
 
 
 @pytest.mark.asyncio