diff --git a/channels/feishu_channel.py b/channels/feishu_channel.py
index 8a4bfcc..262756c 100644
--- a/channels/feishu_channel.py
+++ b/channels/feishu_channel.py
@@ -65,8 +65,6 @@
 • 回复任意结果通知即可继续对话。
 """
 
-FEISHU_RESULT_PREVIEW_LIMIT = 500
-FEISHU_INLINE_RESULT_LIMIT = 1200
 FEISHU_CARD_MARKDOWN_CHUNK = 7000
 FEISHU_FALLBACK_MARKDOWN_LIMIT = 8000
 
@@ -423,31 +421,10 @@ def _build_notification_card(
 
     def _build_result_elements(self, body_text: str) -> list[dict[str, Any]]:
         clean_body = (body_text or "").strip() or "Done."
-        if len(clean_body) <= FEISHU_INLINE_RESULT_LIMIT:
-            return [
-                {
-                    "tag": "markdown",
-                    "content": clean_body,
-                }
-            ]
-
-        panel_elements = [
+        return [
             {"tag": "markdown", "content": chunk}
             for chunk in self._chunk_text(clean_body, FEISHU_CARD_MARKDOWN_CHUNK)
         ]
-        return [
-            {
-                "tag": "collapsible_panel",
-                "expanded": False,
-                "header": {
-                    "title": {
-                        "tag": "plain_text",
-                        "content": "展开查看完整结果",
-                    }
-                },
-                "elements": panel_elements,
-            },
-        ]
 
     def _build_legacy_markdown_card(self, content: str) -> dict[str, Any]:
         return {
diff --git a/tests/test_feishu_message_rendering.py b/tests/test_feishu_message_rendering.py
index 83f5ca1..06eae2c 100644
--- a/tests/test_feishu_message_rendering.py
+++ b/tests/test_feishu_message_rendering.py
@@ -76,7 +76,7 @@ def test_build_failed_card_adds_status_hint(self, mock_feishu_channel):
             for element in card["body"]["elements"]
         )
 
-    def test_build_completed_card_wraps_long_body_in_collapsible_panel(self, mock_feishu_channel):
+    def test_build_completed_card_keeps_long_body_visible(self, mock_feishu_channel):
         task = {
             "id": 99,
             "title": "Long output task",
@@ -93,10 +93,13 @@ def test_build_completed_card_wraps_long_body_in_collapsible_panel(self, mock_fe
             body_text=long_text,
         )
 
-        assert card["body"]["elements"][0]["tag"] == "collapsible_panel"
-        assert card["body"]["elements"][0]["elements"][0]["content"] == long_text
+        assert card["body"]["elements"][0]["tag"] == "markdown"
+        assert card["body"]["elements"] == [{"tag": "markdown", "content": long_text}]
+        assert not any(
+            element.get("tag") == "collapsible_panel" for element in card["body"]["elements"]
+        )
 
-    def test_build_completed_card_expanded_panel_keeps_full_remainder(self, mock_feishu_channel):
+    def test_build_completed_card_long_body_keeps_full_remainder(self, mock_feishu_channel):
         task = {
             "id": 100,
             "title": "Long output task",
@@ -112,19 +115,15 @@ def test_build_completed_card_expanded_panel_keeps_full_remainder(self, mock_fei
             is_completed=True,
             body_text=long_text,
         )
-
-        panel = next(
-            element
-            for element in card["body"]["elements"]
-            if element.get("tag") == "collapsible_panel"
+        assert card["body"]["elements"][0]["content"].startswith("A" * 20)
+        assert "".join(element["content"] for element in card["body"]["elements"]) == long_text
+        assert "truncated" not in "".join(
+            element["content"] for element in card["body"]["elements"]
         )
-        expanded_text = panel["elements"][0]["content"]
-
-        assert expanded_text.startswith("A" * 20)
-        assert expanded_text.endswith("B" * 20)
-        assert "truncated" not in expanded_text
 
-    def test_build_completed_card_long_body_uses_summary_plus_full_panel(self, mock_feishu_channel):
+    def test_build_completed_card_long_body_uses_summary_plus_full_content(
+        self, mock_feishu_channel
+    ):
         task = {
             "id": 101,
             "title": "Long output task",
@@ -142,24 +141,29 @@ def test_build_completed_card_long_body_uses_summary_plus_full_panel(self, mock_
         )
 
         assert card["config"]["summary"]["content"] == "Summary line"
-        assert card["body"]["elements"] == [
-            {
-                "tag": "collapsible_panel",
-                "expanded": False,
-                "header": {
-                    "title": {
-                        "tag": "plain_text",
-                        "content": "展开查看完整结果",
-                    }
-                },
-                "elements": [
-                    {
-                        "tag": "markdown",
-                        "content": long_text,
-                    }
-                ],
-            }
-        ]
+        assert card["body"]["elements"] == [{"tag": "markdown", "content": long_text}]
+
+    def test_build_completed_card_long_body_has_no_collapsible_panel(self, mock_feishu_channel):
+        task = {
+            "id": 102,
+            "title": "Long output task",
+            "prompt": "输出一份很长的结果",
+            "agent": "codex",
+            "working_dir": "~/workspace/agentforge",
+        }
+        long_text = "Intro line\n" + ("B" * 1400)
+
+        card = mock_feishu_channel._build_notification_card(
+            task_id=102,
+            task=task,
+            is_completed=True,
+            body_text=long_text,
+        )
+
+        assert not any(
+            element.get("tag") == "collapsible_panel" for element in card["body"]["elements"]
+        )
+        assert "".join(element["content"] for element in card["body"]["elements"]) == long_text
 
     def test_send_uses_structured_card_and_fallback_content(self, mock_feishu_channel):
         task = {
diff --git a/todo.md b/todo.md
new file mode 100644
index 0000000..08c6c2c
--- /dev/null
+++ b/todo.md
@@ -0,0 +1 @@
+- [completed] 修复飞书长结果卡片在转发场景下首屏不可读且展开重复预览的问题