diff --git a/pipeline_service/agent_loop_v2.py b/pipeline_service/agent_loop_v2.py
index f1651dc..49ab95f 100644
--- a/pipeline_service/agent_loop_v2.py
+++ b/pipeline_service/agent_loop_v2.py
@@ -128,8 +128,7 @@ class AgentExecutor:
             # 5b. LLM 调用
             raw = await self._call_llm()
 
-            import sys
-            print(f"AGENT_LOOP turn={self._turn_count} raw_len={len(raw) if raw else 0}", file=sys.stderr, flush=True)
+            yield "DEBUG_RAW turn=" + str(self._turn_count) + " len=" + str(len(raw) if raw else 0) + "\n"
 
             # 5c. 解析 LLM 输出
             actions = self._parse_actions(raw)