diff --git a/core/server.py b/core/server.py
index 15a55e0..00d05f5 100644
--- a/core/server.py
+++ b/core/server.py
@@ -96,9 +96,7 @@ class SecureFastMCP(FastMCP):
 
         # Rebuild middleware stack
         app.middleware_stack = app.build_middleware_stack()
-        logger.info(
-            "Added middleware stack: WellKnownCacheControl, Session Management"
-        )
+        logger.info("Added middleware stack: WellKnownCacheControl, Session Management")
         return app
 
 
diff --git a/gmail/gmail_tools.py b/gmail/gmail_tools.py
index cef30d9..3576c86 100644
--- a/gmail/gmail_tools.py
+++ b/gmail/gmail_tools.py
@@ -184,7 +184,9 @@ def _format_body_content(text_body: str, html_body: str) -> str:
     )
 
     # Prefer plain text, but fall back to HTML when plain text is empty or clearly low-value.
-    use_html = html_text and (not text_stripped or "<!--" in text_stripped or plain_is_low_value)
+    use_html = html_text and (
+        not text_stripped or "<!--" in text_stripped or plain_is_low_value
+    )
 
     if use_html:
         content = html_text
diff --git a/tests/core/test_well_known_cache_control_middleware.py b/tests/core/test_well_known_cache_control_middleware.py
index 66e9b98..cf3705d 100644
--- a/tests/core/test_well_known_cache_control_middleware.py
+++ b/tests/core/test_well_known_cache_control_middleware.py
@@ -51,7 +51,9 @@ def test_well_known_cache_control_middleware_rewrites_headers():
     assert "etag" not in extra.headers
 
 
-def test_configured_server_applies_no_cache_to_served_oauth_discovery_routes(monkeypatch):
+def test_configured_server_applies_no_cache_to_served_oauth_discovery_routes(
+    monkeypatch,
+):
     monkeypatch.setenv("MCP_ENABLE_OAUTH21", "true")
     monkeypatch.setenv("GOOGLE_OAUTH_CLIENT_ID", "dummy-client")
     monkeypatch.setenv("GOOGLE_OAUTH_CLIENT_SECRET", "dummy-secret")