diff --git a/src/cdl_lsp/constants.py b/src/cdl_lsp/constants.py
index 62f27f8..866570f 100644
--- a/src/cdl_lsp/constants.py
+++ b/src/cdl_lsp/constants.py
@@ -124,20 +124,40 @@
 
     FEATURE_NAMES: set[str] = {
         # Growth features
-        "phantom", "sector", "zoning", "skeletal", "dendritic",
+        "phantom",
+        "sector",
+        "zoning",
+        "skeletal",
+        "dendritic",
         # Surface features
-        "striation", "trigon", "etch_pit", "growth_hillock",
+        "striation",
+        "trigon",
+        "etch_pit",
+        "growth_hillock",
         # Inclusion features
-        "inclusion", "needle", "silk", "fluid", "bubble",
+        "inclusion",
+        "needle",
+        "silk",
+        "fluid",
+        "bubble",
         # Color features
-        "colour", "colour_zone", "pleochroism",
+        "colour",
+        "colour_zone",
+        "pleochroism",
         # Other
-        "lamellar", "banding",
+        "lamellar",
+        "banding",
     }
 
     PHENOMENON_TYPES: set[str] = {
-        "asterism", "chatoyancy", "adularescence", "labradorescence",
-        "play_of_color", "colour_change", "aventurescence", "iridescence",
+        "asterism",
+        "chatoyancy",
+        "adularescence",
+        "labradorescence",
+        "play_of_color",
+        "colour_change",
+        "aventurescence",
+        "iridescence",
     }
 
 # Default point group for each system
diff --git a/src/cdl_lsp/features/definition.py b/src/cdl_lsp/features/definition.py
index 1f1dacd..ef5a565 100644
--- a/src/cdl_lsp/features/definition.py
+++ b/src/cdl_lsp/features/definition.py
@@ -140,9 +140,7 @@ def _create_location(file_path: str, line: int, character: int = 0) -> Any:
     )
 
 
-def _find_definition_in_document(
-    name: str, document_text: str, document_uri: str
-) -> Any | None:
+def _find_definition_in_document(name: str, document_text: str, document_uri: str) -> Any | None:
     """
     Find a @name definition in the document text.
 
diff --git a/src/cdl_lsp/features/diagnostics.py b/src/cdl_lsp/features/diagnostics.py
index 4010580..b4a4c23 100644
--- a/src/cdl_lsp/features/diagnostics.py
+++ b/src/cdl_lsp/features/diagnostics.py
@@ -492,9 +492,7 @@ def _check_modification_typos(
                 break  # Only report first occurrence
 
 
-def _check_feature_names(
-    line_text: str, line_num: int, diagnostics: list[DiagnosticInfo]
-) -> None:
+def _check_feature_names(line_text: str, line_num: int, diagnostics: list[DiagnosticInfo]) -> None:
     """Check for invalid feature names in [...] blocks after forms."""
     # Find feature brackets: }[...] or }@scale[...]
     for match in re.finditer(r"\}(?:@[\d.]+)?\[([^\]]+)\]", line_text):