diff --git a/docs/gns3-copilot/llm-model-configs-api.md b/docs/gns3-copilot/llm-model-configs-api.md
index 30adb03fc..3f4bb7db5 100644
--- a/docs/gns3-copilot/llm-model-configs-api.md
+++ b/docs/gns3-copilot/llm-model-configs-api.md
@@ -235,6 +235,7 @@ curl -X POST http://localhost:3080/v3/access/users/{user_id}/llm-model-configs \
     "context_limit": 128,
     "context_strategy": "balanced",
     "api_key": "sk-xxx",
+    "copilot_mode": "teaching",
     "is_default": true
   }'
 ```
@@ -284,6 +285,7 @@ curl -X POST http://localhost:3080/v3/access/groups/{group_id}/llm-model-configs
     "context_limit": 200,
     "context_strategy": "balanced",
     "api_key": "sk-ant-xxx",
+    "copilot_mode": "lab_assistant",
     "is_default": true
   }'
 ```
@@ -535,7 +537,8 @@ curl -X GET http://localhost:3080/v3/access/users/{user_id}/llm-model-configs/de
     "temperature": 0.7,
     "context_limit": 128,
     "context_strategy": "balanced",
-    "api_key": "sk-xxx"
+    "api_key": "sk-xxx",
+    "copilot_mode": null
   },
   "user_id": "uuid-user",
   "group_id": null,
diff --git a/gns3server/agent/gns3_copilot/prompts/prompt_loader.py b/gns3server/agent/gns3_copilot/prompts/prompt_loader.py
index 955eb3323..f93761c55 100644
--- a/gns3server/agent/gns3_copilot/prompts/prompt_loader.py
+++ b/gns3server/agent/gns3_copilot/prompts/prompt_loader.py
@@ -51,7 +51,7 @@ def load_system_prompt(llm_config: dict | None = None) -> str:
     - "lab_assistant": Full lab assistant mode - diagnostics and configuration enabled
 
     Args:
-        llm_config: LLM model configuration dictionary containing the config field
+        llm_config: LLM model configuration dictionary (flattened structure from get_user_llm_config_full)
 
     Returns:
         str: The system prompt string.
@@ -60,8 +60,9 @@ def load_system_prompt(llm_config: dict | None = None) -> str:
         logger.info("No LLM config provided, using default TEACHING assistant prompt mode")
         return SYSTEM_PROMPT
 
-    config = llm_config.get("config", {})
-    mode = config.get("copilot_mode", "teaching").lower()
+    # llm_config is a flattened dict with copilot_mode at the top level
+    # Example: {"provider": "...", "model": "...", "copilot_mode": "...", ...}
+    mode = llm_config.get("copilot_mode", "teaching").lower()
 
     if mode == "lab_assistant":
         logger.info("Using LAB_ASSISTANT prompt mode (diagnostics + configuration)")