diff --git a/analytics_mcp/coordinator.py b/analytics_mcp/coordinator.py
index ddb738e..27da915 100644
--- a/analytics_mcp/coordinator.py
+++ b/analytics_mcp/coordinator.py
@@ -18,6 +18,7 @@
 server using `@mcp.tool` annotations, thereby 'coordinating' the bootstrapping
 of the server.
 """
+
 from mcp.server.fastmcp import FastMCP
 
 # Creates the singleton.
diff --git a/analytics_mcp/tools/reporting/metadata.py b/analytics_mcp/tools/reporting/metadata.py
index 1fa7a63..94482b0 100644
--- a/analytics_mcp/tools/reporting/metadata.py
+++ b/analytics_mcp/tools/reporting/metadata.py
@@ -155,8 +155,7 @@ def get_metric_filter_hints():
             expressions=[event_count_gt_10_filter, revenue_between_filter]
         )
     )
-    return (
-        f"""Example metric_filter arguments:
+    return f"""Example metric_filter arguments:
       1. A simple filter:
         {proto_to_json(event_count_gt_10_filter)}
 
@@ -172,9 +171,7 @@ def get_metric_filter_hints():
       5. An OR group filter:
         {proto_to_json(or_filter)}
 
-    """
-        + _FILTER_NOTES
-    )
+    """ + _FILTER_NOTES
 
 
 def get_dimension_filter_hints():
@@ -222,8 +219,7 @@ def get_dimension_filter_hints():
             expressions=[source_medium_filter, event_list_filter]
         )
     )
-    return (
-        f"""Example dimension_filter arguments:
+    return f"""Example dimension_filter arguments:
       1. A simple filter:
         {proto_to_json(begins_with)}
 
@@ -239,9 +235,7 @@ def get_dimension_filter_hints():
       5. An OR group filter:
         {proto_to_json(or_filter)}
 
-    """
-        + _FILTER_NOTES
-    )
+    """ + _FILTER_NOTES
 
 
 def get_order_bys_hints():
diff --git a/analytics_mcp/tools/utils.py b/analytics_mcp/tools/utils.py
index 1d1f212..0f35040 100644
--- a/analytics_mcp/tools/utils.py
+++ b/analytics_mcp/tools/utils.py
@@ -47,7 +47,7 @@ def _get_package_version_with_fallback():
 
 def _create_credentials() -> google.auth.credentials.Credentials:
     """Returns Application Default Credentials with read-only scope."""
-    (credentials, _) = google.auth.default(scopes=[_READ_ONLY_ANALYTICS_SCOPE])
+    credentials, _ = google.auth.default(scopes=[_READ_ONLY_ANALYTICS_SCOPE])
     return credentials