diff --git a/dataforge/commands.py b/dataforge/commands.py
index 88bdb85..2ae119a 100644
--- a/dataforge/commands.py
+++ b/dataforge/commands.py
@@ -20,7 +20,7 @@ from .type_check import validate_types, infer_schema_from_data
 def find_files(
     pattern: str,
     recursive: bool = False,
-    directory: Optional[str] = None
+    directory: Optional[str] = None,
 ) -> List[str]:
     """Find files matching a pattern."""
     search_dir = directory or "."
@@ -39,7 +39,7 @@ def resolve_format(fmt: Optional[str], file_path: str) -> str:
         if fmt not in SUPPORTED_FORMATS:
             raise click.BadParameter(
                 f"Unsupported format: {fmt}. Supported: {', '.join(SUPPORTED_FORMATS)}",
-                param_hint="--format"
+                param_hint="--format",
             )
         return fmt
     return detect_format(file_path)
@@ -48,8 +48,16 @@ def resolve_format(fmt: Optional[str], file_path: str) -> str:
 @click.command()
 @click.argument("input_file", type=click.Path(exists=True))
 @click.argument("output_file", type=click.Path())
-@click.option("--from", "-f", "from_format", help="Input format (json, yaml, toml)")
-@click.option("--to", "-t", "to_format", required=True, help="Output format (json, yaml, toml)")
+@click.option(
+    "--from", "-f", "from_format", help="Input format (json, yaml, toml)"
+)
+@click.option(
+    "--to",
+    "-t",
+    "to_format",
+    required=True,
+    help="Output format (json, yaml, toml)",
+)
 @click.option("--indent", "-i", default=2, help="Indentation spaces (0 for compact)")
 @click.option("--quiet", "-q", is_flag=True, help="Minimal output")
 def convert(
@@ -58,7 +66,7 @@ def convert(
     from_format: Optional[str],
     to_format: str,
     indent: int,
-    quiet: bool
+    quiet: bool,
 ) -> None:
     """Convert a file from one format to another.
 
@@ -70,42 +78,57 @@ def convert(
         if to_format not in SUPPORTED_FORMATS:
             raise click.BadParameter(
                 f"Unsupported format: {to_format}. Supported: {', '.join(SUPPORTED_FORMATS)}",
-                param_hint="--to"
+                param_hint="--to",
             )
-        
+
         if input_file == "-":
             import sys
+
             content = sys.stdin.read()
             input_format = from_format or "json"
             data = load_data(content, input_format)
         else:
             input_format = resolve_format(from_format, input_file)
             data = load_data(input_file, input_format)
-        
+
         output_format = to_format
         result = dump_data(data, output_format, indent=indent if indent > 0 else None)
-        
+
         if output_file == "-":
             import sys
+
             sys.stdout.write(result)
         else:
             with open(output_file, "w", encoding="utf-8") as f:
                 f.write(result)
-        
+
         if not quiet:
             click.echo(f"Successfully converted {input_file} to {output_file}")
-    
+
     except Exception as e:
         raise click.ClickException(str(e))
 
 
 @click.command()
 @click.argument("input_files", nargs=-1, type=click.Path(exists=True))
-@click.option("--from", "-f", "from_format", help="Input format (json, yaml, toml)")
-@click.option("--to", "-t", "to_format", required=True, help="Output format (json, yaml, toml)")
+@click.option(
+    "--from", "-f", "from_format", help="Input format (json, yaml, toml)"
+)
+@click.option(
+    "--to",
+    "-t",
+    "to_format",
+    required=True,
+    help="Output format (json, yaml, toml)",
+)
 @click.option("--output-dir", "-o", default=".", help="Output directory for converted files")
 @click.option("--indent", "-i", default=2, help="Indentation spaces")
-@click.option("--pattern", "-p", default="*.{json,yaml,yml,toml}", help="File pattern for batch processing")
+@click.option(
+    "--pattern",
+    "-p",
+    default="*.{json,yaml,yml,toml}",
+    help="File pattern for batch processing",
+)
 @click.option("--recursive", "-r", is_flag=True, help="Search recursively")
 @click.option("--quiet", "-q", is_flag=True, help="Minimal output")
 def batch_convert(
@@ -116,7 +139,7 @@ def batch_convert(
     indent: int,
     pattern: str,
     recursive: bool,
-    quiet: bool
+    quiet: bool,
 ) -> None:
     """Convert multiple files from one format to another.
 
@@ -126,26 +149,26 @@ def batch_convert(
         if to_format not in SUPPORTED_FORMATS:
             raise click.BadParameter(
                 f"Unsupported format: {to_format}. Supported: {', '.join(SUPPORTED_FORMATS)}",
-                param_hint="--to"
+                param_hint="--to",
             )
-        
+
         os.makedirs(output_dir, exist_ok=True)
-        
+
         files = list(input_files) if input_files else find_files(pattern, recursive)
-        
+
         if not files:
             if not quiet:
                 click.echo("No files found matching the pattern")
             return
-        
+
         converted = 0
         errors = 0
-        
+
         for file_path in files:
             try:
                 input_format = resolve_format(from_format, file_path)
                 data = load_data(file_path, input_format)
-                
+
                 output_filename = Path(file_path).stem + f".{to_format}"
                 output_file = os.path.join(output_dir, output_filename)
                 dump_data(data, to_format, output_file, indent=indent if indent > 0 else None)
@@ -154,12 +177,12 @@ def batch_convert(
                 errors += 1
                 if not quiet:
                     click.echo(f"Error converting {file_path}: {e}")
-        
+
         if not quiet:
             click.echo(f"Converted {converted} files, {errors} errors")
         elif errors > 0:
             click.echo(f"Converted {converted}, errors: {errors}", err=True)
-    
+
     except Exception as e:
         raise click.ClickException(str(e))
 
@@ -173,7 +196,7 @@ def validate(
     input_file: str,
     schema_file: Optional[str],
     strict: bool,
-    quiet: bool
+    quiet: bool,
 ) -> None:
     """Validate a file against a JSON Schema.
 
@@ -182,37 +205,47 @@ def validate(
     try:
         if input_file == "-":
             import sys
+
             content = sys.stdin.read()
             input_format = "json"
             data = load_data(content, input_format)
         else:
             input_format = detect_format(input_file)
             data = load_data(input_file, input_format)
-        
+
         if schema_file:
             validator = SchemaValidator(schema_file=schema_file)
             errors = validator.validate(data)
-            
+
             if errors:
                 if not quiet:
                     for error in validator.get_error_messages(errors):
                         click.echo(error)
-                raise click.ClickException(f"Validation failed with {len(errors)} error(s)")
+                raise click.ClickException(
+                    f"Validation failed with {len(errors)} error(s)"
+                )
             else:
                 if not quiet:
                     click.echo("Validation passed")
         else:
             if not quiet:
                 click.echo(f"File is valid {input_format}")
-    
+
     except Exception as e:
         raise click.ClickException(str(e))
 
 
 @click.command()
 @click.argument("input_files", nargs=-1, type=click.Path(exists=True))
-@click.option("--schema", "-s", "schema_file", required=True, help="Path to JSON Schema file")
-@click.option("--pattern", "-p", default="*.{json,yaml,yml,toml}", help="File pattern for batch processing")
+@click.option(
+    "--schema", "-s", "schema_file", required=True, help="Path to JSON Schema file"
+)
+@click.option(
+    "--pattern",
+    "-p",
+    default="*.{json,yaml,yml,toml}",
+    help="File pattern for batch processing",
+)
 @click.option("--recursive", "-r", is_flag=True, help="Search recursively")
 @click.option("--quiet", "-q", is_flag=True, help="Minimal output")
 def batch_validate(
@@ -220,7 +253,7 @@ def batch_validate(
     schema_file: str,
     pattern: str,
     recursive: bool,
-    quiet: bool
+    quiet: bool,
 ) -> None:
     """Validate multiple files against a JSON Schema.
 
@@ -228,23 +261,23 @@ def batch_validate(
     """
     try:
         files = list(input_files) if input_files else find_files(pattern, recursive)
-        
+
         if not files:
             if not quiet:
                 click.echo("No files found matching the pattern")
             return
-        
+
         validator = SchemaValidator(schema_file=schema_file)
         valid_count = 0
         invalid_count = 0
         invalid_files = []
-        
+
         for file_path in files:
             try:
                 input_format = detect_format(file_path)
                 data = load_data(file_path, input_format)
                 errors = validator.validate(data)
-                
+
                 if errors:
                     invalid_count += 1
                     invalid_files.append(file_path)
@@ -261,15 +294,17 @@ def batch_validate(
                 invalid_files.append(file_path)
                 if not quiet:
                     click.echo(f"Error: {file_path} - {e}")
-        
+
         if not quiet:
             click.echo(f"\nSummary: {valid_count} valid, {invalid_count} invalid")
         elif invalid_count > 0:
             click.echo(f"Valid: {valid_count}, Invalid: {invalid_count}", err=True)
-        
+
         if invalid_count > 0:
-            raise click.ClickException(f"Validation failed for {invalid_count} file(s)")
-    
+            raise click.ClickException(
+                f"Validation failed for {invalid_count} file(s)"
+            )
+
     except Exception as e:
         raise click.ClickException(str(e))
 
@@ -281,7 +316,7 @@ def batch_validate(
 def typecheck(
     input_file: str,
     infer: bool,
-    quiet: bool
+    quiet: bool,
 ) -> None:
     """Check types in a data file.
 
@@ -290,17 +325,19 @@ def typecheck(
     try:
         if input_file == "-":
             import sys
+
             content = sys.stdin.read()
             input_format = "json"
             data = load_data(content, input_format)
         else:
             input_format = detect_format(input_file)
             data = load_data(input_file, input_format)
-        
+
         if infer:
             schema = infer_schema_from_data(data)
             if not quiet:
                 import json
+
                 click.echo(json.dumps(schema, indent=2))
         else:
             if not quiet:
@@ -311,6 +348,6 @@ def typecheck(
                     click.echo(f"Type: array with {len(data)} items")
                 else:
                     click.echo(f"Type: {inferred_type}")
-    
+
     except Exception as e:
         raise click.ClickException(str(e))