diff --git a/backend/service/debug_agent.py b/backend/service/debug_agent.py
index 5c61e4f..d9c5f09 100644
--- a/backend/service/debug_agent.py
+++ b/backend/service/debug_agent.py
@@ -206,7 +206,7 @@ async def debug_workflow_errors(workflow_data: Dict[str, Any]):
         # Get session_id and config from request context
         session_id = get_session_id()
         config = get_config()
-        workflow_config_adapt(config)
+        config = workflow_config_adapt(config)
         
         if not session_id:
             session_id = str(uuid.uuid4())  # Fallback if no context
diff --git a/backend/service/mcp_client.py b/backend/service/mcp_client.py
index 930460c..b92edac 100644
--- a/backend/service/mcp_client.py
+++ b/backend/service/mcp_client.py
@@ -2,7 +2,7 @@
 Author: ai-business-hql qingli.hql@alibaba-inc.com
 Date: 2025-06-16 16:50:17
 LastEditors: ai-business-hql ai.bussiness.hql@gmail.com
-LastEditTime: 2025-09-02 17:11:50
+LastEditTime: 2025-10-11 16:32:59
 FilePath: /comfyui_copilot/backend/service/mcp-client.py
 Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
 '''
@@ -80,9 +80,6 @@ async def comfyui_agent_invoke(messages: List[Dict[str, Any]], images: List[Imag
             cache_tools_list=True,
             client_session_timeout_seconds=300.0
         ) as server:
-            # tools = await server.list_tools()
-            
-            # Model selection is handled inside create_agent via config / kwargs precedence
             
             # 创建workflow_rewrite_agent实例 (session_id通过context获取)
             workflow_rewrite_agent_instance = create_workflow_rewrite_agent()
diff --git a/backend/service/workflow_rewrite_agent.py b/backend/service/workflow_rewrite_agent.py
index d8a5823..e4f8d2b 100644
--- a/backend/service/workflow_rewrite_agent.py
+++ b/backend/service/workflow_rewrite_agent.py
@@ -45,7 +45,7 @@ def create_workflow_rewrite_agent():
     language = get_language()
     session_id = get_session_id() or "unknown_session"
     config = get_config()
-    workflow_config_adapt(config)
+    config = workflow_config_adapt(config)
 
     return create_agent(
         name="Workflow Rewrite Agent",
diff --git a/backend/service/workflow_rewrite_agent_simple.py b/backend/service/workflow_rewrite_agent_simple.py
index cc8076e..da35eb7 100644
--- a/backend/service/workflow_rewrite_agent_simple.py
+++ b/backend/service/workflow_rewrite_agent_simple.py
@@ -83,7 +83,7 @@ ComfyUI API格式工作流是一个JSON对象，其中：
 }
 """
         config = get_config()
-        workflow_config_adapt(config)
+        config = workflow_config_adapt(config)
         # 创建OpenAI客户端
         client = OpenAI(
             base_url = config.get("openai_base_url") or LLM_DEFAULT_BASE_URL,
diff --git a/backend/utils/key_utils.py b/backend/utils/key_utils.py
index e22c3ec..62843fa 100644
--- a/backend/utils/key_utils.py
+++ b/backend/utils/key_utils.py
@@ -1,10 +1,22 @@
 
+from copy import deepcopy
 
-def workflow_config_adapt(config: dict):
-    if config:
-        if config.get("workflow_llm_api_key"):
-            config["openai_api_key"] = config.get("workflow_llm_api_key")
-            config["workflow_llm_api_key"] = None
-        if config.get("workflow_llm_base_url"):
-            config["openai_base_url"] = config.get("workflow_llm_base_url")
-            config["workflow_llm_base_url"] = None
\ No newline at end of file
+def workflow_config_adapt(config: dict) -> dict:
+    """Return a deep-copied and adapted workflow config without mutating input.
+
+    - Map workflow_llm_api_key -> openai_api_key (and null out original key)
+    - Map workflow_llm_base_url -> openai_base_url (and null out original key)
+    """
+    if not config:
+        return {}
+
+    new_config = deepcopy(config)
+
+    if new_config.get("workflow_llm_api_key"):
+        new_config["openai_api_key"] = new_config.get("workflow_llm_api_key")
+        new_config["workflow_llm_api_key"] = None
+    if new_config.get("workflow_llm_base_url"):
+        new_config["openai_base_url"] = new_config.get("workflow_llm_base_url")
+        new_config["workflow_llm_base_url"] = None
+
+    return new_config
\ No newline at end of file