diff --git a/src/__init__.py b/src/__init__.py
index 4062beb4..6dcf301b 100644
--- a/src/__init__.py
+++ b/src/__init__.py
@@ -3,8 +3,9 @@ from dotenv import load_dotenv
 load_dotenv("src/.env", override=True)
 
 from concurrent.futures import ThreadPoolExecutor  # noqa: E402
-from src.config import config  # noqa: E402
-from src.knowledge import knowledge_base, graph_base  # noqa: E402
+from src.config import config as config  # noqa: E402
+from src.knowledge import knowledge_base as knowledge_base  # noqa: E402
+from src.knowledge import graph_base as graph_base  # noqa: E402
 
 
-executor = ThreadPoolExecutor()
+executor = ThreadPoolExecutor()  # noqa: E402
diff --git a/src/models/__init__.py b/src/models/__init__.py
index 9e3ca618..585e9d70 100644
--- a/src/models/__init__.py
+++ b/src/models/__init__.py
@@ -1,4 +1,4 @@
 from src.models.chat_model import select_model, get_custom_model
 from src.models.embedding import select_embedding_model
 
-__all__ = ['select_model', 'select_embedding_model', 'get_custom_model']
+__all__ = ["select_model", "select_embedding_model", "get_custom_model"]
diff --git a/src/plugins/guard.py b/src/plugins/guard.py
index 3aa66b34..7f77ae83 100644
--- a/src/plugins/guard.py
+++ b/src/plugins/guard.py
@@ -1,15 +1,16 @@
 import os
-from typing import List
 
-def load_keywords(file_path: str) -> List[str]:
+
+def load_keywords(file_path: str) -> list[str]:
     """Loads keywords from a file, one per line."""
     if not os.path.exists(file_path):
         keywords = []
-    with open(file_path, "r", encoding="utf-8") as f:
+    with open(file_path, encoding="utf-8") as f:
         keywords = [line.strip() for line in f if line.strip() and not line.startswith("#")]
 
     return keywords
 
+
 class ContentGuard:
     def __init__(self, keywords_file: str = "src/static/bad_keywords.txt"):
         self.keywords = load_keywords(keywords_file)
@@ -30,5 +31,6 @@ class ContentGuard:
                 return True
         return False
 
+
 # Global instance
 content_guard = ContentGuard()