diff --git a/docs/design/architecture-v2.6.md b/docs/design/architecture-v2.6.md
index ab3b743..d87f91b 100644
--- a/docs/design/architecture-v2.6.md
+++ b/docs/design/architecture-v2.6.md
@@ -789,7 +789,7 @@ async def check_inbox():
     if not INBOX_PATH.exists():
         return
     lines = INBOX_PATH.read_text().strip().split('\n')
-    INBOX_PATH.unlink()  # 原子读取+删除(参考 agent-chorus --clear 模式)
+    INBOX_PATH.write_text('')  # truncate：清空内容不删除文件，避免并发追加写入时文件不存在
     for line in lines:
         msg = json.loads(line)
         await handle_event(msg['event'], msg['task_id'], msg['from'])