diff --git a/src/ocrmypdf/__main__.py b/src/ocrmypdf/__main__.py
index b1514a86..74ffb3e6 100755
--- a/src/ocrmypdf/__main__.py
+++ b/src/ocrmypdf/__main__.py
@@ -16,8 +16,8 @@ from contextlib import suppress
 from ocrmypdf import __version__
 from ocrmypdf._pipelines.ocr import run_pipeline_cli
 from ocrmypdf._validation import check_options
-from ocrmypdf.cli import get_options_and_plugins
 from ocrmypdf.api import Verbosity, configure_logging
+from ocrmypdf.cli import get_options_and_plugins
 from ocrmypdf.exceptions import (
     BadArgsError,
     ExitCode,
diff --git a/src/ocrmypdf/_options.py b/src/ocrmypdf/_options.py
index 1353abab..04d012c3 100644
--- a/src/ocrmypdf/_options.py
+++ b/src/ocrmypdf/_options.py
@@ -164,7 +164,6 @@ class OCROptions(BaseModel):
         default_factory=dict, exclude=True, alias='_extra_attrs'
     )
 
-
     @field_validator('languages')
     @classmethod
     def validate_languages(cls, v):
diff --git a/src/ocrmypdf/_plugin_manager.py b/src/ocrmypdf/_plugin_manager.py
index 146704fc..f0c2bc0d 100644
--- a/src/ocrmypdf/_plugin_manager.py
+++ b/src/ocrmypdf/_plugin_manager.py
@@ -5,7 +5,6 @@
 
 from __future__ import annotations
 
-import argparse
 import importlib
 import importlib.util
 import pkgutil
@@ -17,7 +16,6 @@ import pluggy
 
 import ocrmypdf.builtin_plugins
 from ocrmypdf import pluginspec
-from ocrmypdf.cli import get_parser
 
 
 class OcrmypdfPluginManager(pluggy.PluginManager):
diff --git a/src/ocrmypdf/cli.py b/src/ocrmypdf/cli.py
index 025edbe5..0d61523e 100644
--- a/src/ocrmypdf/cli.py
+++ b/src/ocrmypdf/cli.py
@@ -7,16 +7,16 @@ from __future__ import annotations
 
 import argparse
 from collections.abc import Callable, Mapping
-from typing import Any, TypeVar, TYPE_CHECKING
+from typing import Any, TypeVar
 
-from ocrmypdf._defaults import DEFAULT_LANGUAGE, DEFAULT_ROTATE_PAGES_THRESHOLD
+import pluggy
+
+from ocrmypdf._defaults import DEFAULT_ROTATE_PAGES_THRESHOLD
 from ocrmypdf._defaults import PROGRAM_NAME as _PROGRAM_NAME
+from ocrmypdf._options import OCROptions
+from ocrmypdf._plugin_manager import get_plugin_manager
 from ocrmypdf._version import __version__ as _VERSION
 
-if TYPE_CHECKING:
-    import pluggy
-    from ocrmypdf._options import OCROptions
-
 T = TypeVar('T', int, float)
 
 
@@ -100,7 +100,7 @@ class LanguageSetAction(argparse.Action):
     def __call__(self, parser, namespace, values, option_string=None):
         """Add a language to the set."""
         dest = getattr(namespace, self.dest)
-        if '+' in values:
+        if isinstance(values, str) and '+' in values:
             [dest.append(lang) for lang in values.split('+')]
         else:
             dest.append(values)
@@ -471,14 +471,12 @@ plugins_only_parser.add_argument(
 )
 
 
-def namespace_to_options(ns) -> 'OCROptions':
+def namespace_to_options(ns) -> OCROptions:
     """Convert argparse.Namespace to OCROptions.
-    
+
     This function encapsulates CLI-specific knowledge of how command line
     arguments map to our internal options model.
     """
-    from ocrmypdf._options import OCROptions
-    
     # Extract known fields
     known_fields = {}
     extra_attrs = {}
@@ -504,22 +502,19 @@ def namespace_to_options(ns) -> 'OCROptions':
 
 def get_options_and_plugins(
     args=None,
-) -> tuple['OCROptions', 'pluggy.PluginManager']:
+) -> tuple[OCROptions, pluggy.PluginManager]:
     """Parse command line arguments and return OCROptions and plugin manager.
-    
+
     This is the main entry point for CLI argument processing. It handles
     plugin discovery, argument parsing, and conversion to our internal
     options model.
-    
+
     Args:
         args: Command line arguments. If None, uses sys.argv.
-        
+
     Returns:
         Tuple of (OCROptions, PluginManager)
     """
-    import pluggy
-    from ocrmypdf._plugin_manager import get_plugin_manager
-    
     # First pass: get plugins so we can register their options
     pre_options, _unused = plugins_only_parser.parse_known_args(args=args)
     plugin_manager = get_plugin_manager(pre_options.plugins)
@@ -531,8 +526,8 @@ def get_options_and_plugins(
 
     # Parse all arguments
     namespace = parser.parse_args(args=args)
-    
+
     # Convert to OCROptions
     options = namespace_to_options(namespace)
-    
+
     return options, plugin_manager
diff --git a/tests/test_json_serialization.py b/tests/test_json_serialization.py
index c2402ff8..56b1e8cb 100644
--- a/tests/test_json_serialization.py
+++ b/tests/test_json_serialization.py
@@ -25,6 +25,7 @@ def worker_function(options_json: str) -> str:
 
     # Return as JSON string
     import json
+
     return json.dumps(result)
 
 
@@ -68,6 +69,7 @@ def test_json_serialization_multiprocessing():
 
     # Verify results from worker processes
     import json
+
     for result_json in results:
         result = json.loads(result_json)
         assert result['input_file'] == '/test/input.pdf'
@@ -122,7 +124,9 @@ def test_json_serialization_with_none_values():
     # Verify None values are preserved (check actual defaults from model)
     assert reconstructed.tesseract_timeout == 0.0  # Default value, not None
     assert reconstructed.fast_web_view == 1.0  # Default value, not None
-    assert reconstructed.color_conversion_strategy == "LeaveColorUnchanged"  # Default value
+    assert (
+        reconstructed.color_conversion_strategy == "LeaveColorUnchanged"
+    )  # Default value
     assert reconstructed.pdfa_image_compression is None  # This one is actually None
 
     # Verify non-None values are preserved
diff --git a/tests/test_unpaper.py b/tests/test_unpaper.py
index 9319a97e..31425cba 100644
--- a/tests/test_unpaper.py
+++ b/tests/test_unpaper.py
@@ -11,8 +11,8 @@ import pytest
 from packaging.version import Version
 
 from ocrmypdf._exec import unpaper
-from ocrmypdf.cli import get_options_and_plugins
 from ocrmypdf._validation import check_options
+from ocrmypdf.cli import get_options_and_plugins
 from ocrmypdf.exceptions import BadArgsError, ExitCode, MissingDependencyError
 
 from .conftest import check_ocrmypdf, have_unpaper, run_ocrmypdf_api
diff --git a/tests/test_validation.py b/tests/test_validation.py
index aaf2bb7d..d829905b 100644
--- a/tests/test_validation.py
+++ b/tests/test_validation.py
@@ -44,11 +44,7 @@ def make_opts(*args, **kwargs):
 
 def make_ocr_opts(input_file='a.pdf', output_file='b.pdf', **kwargs):
     """Create OCROptions directly for testing Pydantic validation."""
-    return OCROptions(
-        input_file=input_file,
-        output_file=output_file,
-        **kwargs
-    )
+    return OCROptions(input_file=input_file, output_file=output_file, **kwargs)
 
 
 def test_old_tesseract_error():
@@ -78,11 +74,17 @@ def test_lossless_redo():
 
 
 def test_mutex_options():
-    with pytest.raises(ValueError, match="Choose only one of --force-ocr, --skip-text, --redo-ocr"):
+    with pytest.raises(
+        ValueError, match="Choose only one of --force-ocr, --skip-text, --redo-ocr"
+    ):
         make_ocr_opts(force_ocr=True, skip_text=True)
-    with pytest.raises(ValueError, match="Choose only one of --force-ocr, --skip-text, --redo-ocr"):
+    with pytest.raises(
+        ValueError, match="Choose only one of --force-ocr, --skip-text, --redo-ocr"
+    ):
         make_ocr_opts(redo_ocr=True, skip_text=True)
-    with pytest.raises(ValueError, match="Choose only one of --force-ocr, --skip-text, --redo-ocr"):
+    with pytest.raises(
+        ValueError, match="Choose only one of --force-ocr, --skip-text, --redo-ocr"
+    ):
         make_ocr_opts(redo_ocr=True, force_ocr=True)