diff --git a/src/ghoshell_moss/message/utils.py b/src/ghoshell_moss/message/utils.py
index 7db086f..534184e 100644
--- a/src/ghoshell_moss/message/utils.py
+++ b/src/ghoshell_moss/message/utils.py
@@ -10,6 +10,6 @@ def new_text_message(content: str, *, role: str | Role = "") -> Message:
     """
     创建一个系统消息.
     """
-    meta = MessageMeta(role=str(role))
+    meta = MessageMeta(role=role.value if isinstance(role, Role) else str(role))
     obj = Text(text=content)
-    return Message(meta=meta).as_completed([obj.to_content()])
+    return Message(meta=meta, seq="head").as_completed([obj.to_content()])
diff --git a/tests/channels/test_py_channel.py b/tests/channels/test_py_channel.py
index 3ec05b1..87acd54 100644
--- a/tests/channels/test_py_channel.py
+++ b/tests/channels/test_py_channel.py
@@ -4,6 +4,7 @@
 from ghoshell_moss.core.concepts.command import CommandTask, PyCommand
 from ghoshell_moss.core.py_channel import PyChannel
 from ghoshell_moss.message import Message, new_text_message
+from ghoshell_moss.message.contents import Text
 
 chan = PyChannel(name="test")
 
@@ -219,3 +220,5 @@ def foo() -> list[Message]:
         # 更新后, messages 也变更了.
         await broker.refresh_meta()
         assert len(broker.meta().context) == 2
+        assert broker.meta().context[0].contents[0] == Text(text="hello").to_content()
+        assert broker.meta().context[1].contents[0] == Text(text="world").to_content()