diff --git a/src/takopi/engines.py b/src/takopi/engines.py
index 1e1a775..445610c 100644
--- a/src/takopi/engines.py
+++ b/src/takopi/engines.py
@@ -38,9 +38,7 @@ def _codex_check_setup(_config: EngineConfig, _config_path: Path) -> list[SetupI
     return []
 
 
-def _codex_build_runner(
-    config: EngineConfig, config_path: Path
-) -> Runner:
+def _codex_build_runner(config: EngineConfig, config_path: Path) -> Runner:
     codex_cmd = shutil.which("codex")
     if not codex_cmd:
         raise ConfigError(
diff --git a/tests/test_codex_tool_result_summary.py b/tests/test_codex_tool_result_summary.py
index b93e194..cdc9fb1 100644
--- a/tests/test_codex_tool_result_summary.py
+++ b/tests/test_codex_tool_result_summary.py
@@ -66,4 +66,3 @@ def test_translate_mcp_tool_call_summarizes_legacy_structured_key() -> None:
     assert len(out) == 1
     assert isinstance(out[0], ActionEvent)
     assert out[0].action.detail["result_summary"]["has_structured"] is True
-
diff --git a/tests/test_exec_render.py b/tests/test_exec_render.py
index 30161d4..00458bb 100644
--- a/tests/test_exec_render.py
+++ b/tests/test_exec_render.py
@@ -81,7 +81,8 @@ def test_render_event_cli_handles_action_kinds() -> None:
     )
     assert any("tool: github.search_issues" in line for line in out)
     assert any(
-        "files: added `README.md`, updated `src/compute_answer.py`" in line for line in out
+        "files: added `README.md`, updated `src/compute_answer.py`" in line
+        for line in out
     )
     assert any(line.startswith("✗ stream error") for line in out)
 
@@ -103,7 +104,9 @@ def test_file_change_renders_relative_paths_inside_cwd() -> None:
             },
         )
     )
-    assert any("files: updated `README.md`, updated `README.md`" in line for line in out)
+    assert any(
+        "files: updated `README.md`, updated `README.md`" in line for line in out
+    )
 
 
 def test_progress_renderer_renders_progress_and_final() -> None: