diff --git a/src/daemon/mail_notify.py b/src/daemon/mail_notify.py
index b6d86c2..5b43147 100644
--- a/src/daemon/mail_notify.py
+++ b/src/daemon/mail_notify.py
@@ -64,6 +64,9 @@ _REASON_MAP: Dict[str, tuple] = {
         "主模型和备用模型均失败",
         lambda d: f"fallback {d.get('fallback_count', '?')} 次，"
                   f"原因: {d.get('fallback_reason', '未知')}"),
+    "agent_error": (
+        "Agent 内部错误",
+        lambda d: f"stderr: {_extract_stderr(d)}" if _extract_stderr(d) else ""),
     "agent_failed": ("收件人主动标记失败", lambda d: ""),
     "compact_failed": ("上下文压缩失败", lambda d: f"stderr: {_extract_stderr(d)}" if _extract_stderr(d) else ""),
     "compact_hanging": ("上下文压缩长时间未完成", lambda d: ""),