diff --git a/src/agents/common/context.py b/src/agents/common/context.py
index b7b5c91f..2f61dcd8 100644
--- a/src/agents/common/context.py
+++ b/src/agents/common/context.py
@@ -93,7 +93,8 @@ class BaseContext:
         metadata={
             "name": "Skills",
             "options": [],
-            "description": "可选技能列表（由超级管理员维护）。运行时仅挂载并只读暴露选中的 skills。技能依赖的工具和 MCP 服务器也会被自动挂载。",
+            "description": "可选技能列表（由超级管理员维护）。运行时仅挂载并只读暴露选中的 "
+            "skills。技能依赖的工具和 MCP 服务器也会被自动挂载。",
             "type": "list",
         },
     )
diff --git a/src/agents/common/middlewares/skills_middleware.py b/src/agents/common/middlewares/skills_middleware.py
index 455f00db..74fcab65 100644
--- a/src/agents/common/middlewares/skills_middleware.py
+++ b/src/agents/common/middlewares/skills_middleware.py
@@ -20,7 +20,6 @@ from src.services.skill_service import _normalize_string_list, is_valid_skill_sl
 from src.storage.postgres.manager import pg_manager
 from src.utils.logging_config import logger
 
-
 # =============================================================================
 # 类型定义
 # =============================================================================
diff --git a/src/agents/common/toolkits/buildin/tools.py b/src/agents/common/toolkits/buildin/tools.py
index aa5187ea..ed23665a 100644
--- a/src/agents/common/toolkits/buildin/tools.py
+++ b/src/agents/common/toolkits/buildin/tools.py
@@ -6,8 +6,7 @@ from typing import Annotated, Any
 import requests
 
 from src import config, graph_base
-from src.agents.common.toolkits.registry import tool
-from src.agents.common.toolkits.registry import ToolExtraMetadata, _all_tool_instances, _extra_registry
+from src.agents.common.toolkits.registry import ToolExtraMetadata, _all_tool_instances, _extra_registry, tool
 from src.storage.minio import aupload_file_to_minio
 from src.utils import logger
 
diff --git a/src/agents/common/toolkits/mysql/tools.py b/src/agents/common/toolkits/mysql/tools.py
index a8e21125..1574088a 100644
--- a/src/agents/common/toolkits/mysql/tools.py
+++ b/src/agents/common/toolkits/mysql/tools.py
@@ -46,7 +46,6 @@ def get_connection_manager() -> MySQLConnectionManager:
     return _connection_manager
 
 
-
 @tool(
     category="mysql",
     tags=["数据库", "查询"],
diff --git a/src/knowledge/base.py b/src/knowledge/base.py
index 849d284c..027fc7bd 100644
--- a/src/knowledge/base.py
+++ b/src/knowledge/base.py
@@ -477,9 +477,9 @@ class KnowledgeBase(ABC):
             操作结果
         """
         if db_id in self.databases_meta:
+            from src.knowledge.utils.kb_utils import parse_minio_url
             from src.repositories.knowledge_base_repository import KnowledgeBaseRepository
             from src.storage.minio import get_minio_client
-            from src.knowledge.utils.kb_utils import parse_minio_url
 
             minio_client = get_minio_client()
 
diff --git a/test/test_kb_minio_cleanup.py b/test/test_kb_minio_cleanup.py
index 2f260635..4bdec036 100644
--- a/test/test_kb_minio_cleanup.py
+++ b/test/test_kb_minio_cleanup.py
@@ -49,20 +49,19 @@ async def test_delete_knowledge_base_cleanup():
 
         # 上传到 kb-documents (原始文件)
         test_object_name = f"{db_id}/test_file_{db_id[:8]}.txt"
-        upload_result = minio_client.upload_file(
+        minio_client.upload_file(
             bucket_name="kb-documents",
             object_name=test_object_name,
             data=test_file_content,
             content_type="text/plain",
         )
-        test_file_url = upload_result.url
         print(f"   文件上传到 kb-documents: {test_object_name}")
 
         # 上传到 kb-parsed (解析后的 markdown)
         test_file_id = f"file_test_{db_id[:8]}"
         parsed_object_name = f"{db_id}/{test_file_id}/parsed.md"
         parsed_content = b"# Test Parsed Content\n\nThis is parsed markdown."
-        upload_result_parsed = minio_client.upload_file(
+        minio_client.upload_file(
             bucket_name="kb-parsed",
             object_name=parsed_object_name,
             data=parsed_content,