diff --git a/agent/agent_config.py b/agent/agent_config.py
index a7fbb62..4549f28 100644
--- a/agent/agent_config.py
+++ b/agent/agent_config.py
@@ -119,7 +119,7 @@ class AgentConfig:
             messages = []
         language = request.language or bot_config.get("language", "zh")
         preamble_text, system_prompt = get_preamble_text(language, bot_config.get("system_prompt"))
-        enable_thinking = request.enable_thinking and "```guideline" in request.system_prompt
+        enable_thinking = request.enable_thinking and "```guideline" in bot_config.get("system_prompt")
 
         config = cls(
             bot_id=request.bot_id,