diff --git a/gateway/platforms/wecom.py b/gateway/platforms/wecom.py
index 453b95a717..873284de79 100644
--- a/gateway/platforms/wecom.py
+++ b/gateway/platforms/wecom.py
@@ -142,6 +142,7 @@ class WeComAdapter(BasePlatformAdapter):
     """WeCom AI Bot adapter backed by a persistent WebSocket connection."""
 
     MAX_MESSAGE_LENGTH = MAX_MESSAGE_LENGTH
+    SUPPORTS_MESSAGE_EDITING = False
     # Threshold for detecting WeCom client-side message splits.
     # When a chunk is near the 4000-char limit, a continuation is almost certain.
     _SPLIT_THRESHOLD = 3900
diff --git a/tests/gateway/test_wecom.py b/tests/gateway/test_wecom.py
index 3c4ec357bc..18de405e39 100644
--- a/tests/gateway/test_wecom.py
+++ b/tests/gateway/test_wecom.py
@@ -36,6 +36,11 @@ class TestWeComRequirements:
 
 
 class TestWeComAdapterInit:
+    def test_declares_non_editable_message_capability(self):
+        from gateway.platforms.wecom import WeComAdapter
+
+        assert WeComAdapter.SUPPORTS_MESSAGE_EDITING is False
+
     def test_reads_config_from_extra(self):
         from gateway.platforms.wecom import WeComAdapter