diff --git a/assets/workflow/auto-dev-loop/workflow_engine/runner.py b/assets/workflow/auto-dev-loop/workflow_engine/runner.py
index f6025a0..ddd854e 100644
--- a/assets/workflow/auto-dev-loop/workflow_engine/runner.py
+++ b/assets/workflow/auto-dev-loop/workflow_engine/runner.py
@@ -23,6 +23,7 @@ STEP_MAP = {
 }
 
 STEP_FLOW = ["step1", "step2", "step3", "step4", "step5"]
+MAX_RETRY_COUNT = 3
 
 
 def load_state() -> dict:
@@ -80,6 +81,12 @@ def run_step(step: str, state: dict, input_data: dict = None):
         "output": f"[MOCK] {step} completed",
         "timestamp": datetime.now().isoformat()
     }
+    # 可选：通过环境变量模拟 step4 验证失败，用于本地验证重试/熔断逻辑
+    # 默认不生效，不影响正常使用
+    if step == "step4":
+        mock_verify = os.environ.get("VIBE_WORKFLOW_MOCK_VERIFY_STATUS")
+        if mock_verify in ("success", "failed"):
+            result["verify"] = {"status": mock_verify}
     # ========================
     
     # 保存产物
@@ -117,79 +124,51 @@ def start_workflow(input_file: str = None):
     
     print(f"[START] 新工作流 run_id={run_id}")
     
-    # 依次执行 step1 -> step5
-    for step in STEP_FLOW:
+    # 显式状态机：支持 step5 失败回跳 step2，并可多次重试（带熔断）
+    step_idx = 0
+    while step_idx < len(STEP_FLOW):
+        step = STEP_FLOW[step_idx]
         result = run_step(step, state, input_data)
-        
+
         if not result:
             state["status"] = "error"
             save_state(state)
             return
-        
+
         # step4 后检查验证结果
         if step == "step4":
             verify_status = result.get("verify", {}).get("status", "success")
             state["verify"] = {"status": verify_status}
-        
-        # step5 决定下一步
+
+        # step5 决定下一步（回跳/完成）
         if step == "step5":
-            # 模拟 step5 的决策逻辑
             if state.get("verify", {}).get("status") == "failed":
-                state["target_step"] = "step2"  # 失败回跳
-                state["status"] = "retry"
-                print(f"[RETRY] 验证失败，返回 step2 重规划")
-            else:
-                state["target_step"] = "done"
-                state["status"] = "completed"
-                print(f"[COMPLETE] 工作流完成")
-        
-        save_state(state)
-        
-        # 如果需要回跳，递归处理（带熔断）
-        if state.get("target_step") == "step2":
-            retry_count = state.get("retry_count", 0) + 1
-            if retry_count > 3:
-                print(f"[FATAL] 超过最大重试次数")
-                state["status"] = "fatal_error"
-                save_state(state)
-                return
-            state["retry_count"] = retry_count
-            print(f"[RETRY {retry_count}/3] 从 step2 重新执行")
-            
-            # 递归调用自身，复用完整的验证逻辑
-            state["target_step"] = None  # 清除回跳标记
-            save_state(state)
-            
-            for retry_step in STEP_FLOW[1:]:  # step2 onwards
-                result = run_step(retry_step, state, input_data)
-                if not result:
-                    state["status"] = "error"
+                next_retry_count = state.get("retry_count", 0) + 1
+                if next_retry_count > MAX_RETRY_COUNT:
+                    print(f"[FATAL] 超过最大重试次数")
+                    state["retry_count"] = next_retry_count
+                    state["target_step"] = "step2"
+                    state["status"] = "fatal_error"
                     save_state(state)
                     return
-                
-                # step4 后检查验证结果
-                if retry_step == "step4":
-                    verify_status = result.get("verify", {}).get("status", "success")
-                    state["verify"] = {"status": verify_status}
-                
-                # step5 决定下一步
-                if retry_step == "step5":
-                    if state.get("verify", {}).get("status") == "failed":
-                        state["target_step"] = "step2"
-                        state["status"] = "retry"
-                        print(f"[RETRY] 验证仍失败，继续重试")
-                        break  # 跳出内层循环，触发外层重试检查
-                    else:
-                        state["target_step"] = "done"
-                        state["status"] = "completed"
-                        print(f"[COMPLETE] 重试成功，工作流完成")
-                
+
+                state["retry_count"] = next_retry_count
+                state["target_step"] = "step2"
+                state["status"] = "retry"
                 save_state(state)
-            
-            # 如果 step5 设置了新的回跳目标，继续递归
-            if state.get("target_step") == "step2":
-                continue  # 继续外层循环的下一次迭代（实际会被 break 跳出）
-            break
+
+                print(f"[RETRY {next_retry_count}/{MAX_RETRY_COUNT}] 验证失败，返回 step2 重规划")
+                step_idx = STEP_FLOW.index("step2")
+                continue
+
+            state["target_step"] = "done"
+            state["status"] = "completed"
+            save_state(state)
+            print(f"[COMPLETE] 工作流完成")
+            return
+
+        save_state(state)
+        step_idx += 1
 
 
 def main():