fix: resolve listed messaging targets consistently

tests/tools/test_send_message_tool.py

@@ -203,6 +203,44 @@ class TestSendMessageTool:
             media_files=[],
         )
 
+    def test_display_label_target_resolves_via_channel_directory(self, tmp_path):
+        config, telegram_cfg = _make_config()
+        cache_file = tmp_path / "channel_directory.json"
+        cache_file.write_text(json.dumps({
+            "updated_at": "2026-01-01T00:00:00",
+            "platforms": {
+                "telegram": [
+                    {"id": "-1001:17585", "name": "Coaching Chat / topic 17585", "type": "group"}
+                ]
+            },
+        }))
+
+        with patch("gateway.channel_directory.DIRECTORY_PATH", cache_file), \
+             patch("gateway.config.load_gateway_config", return_value=config), \
+             patch("tools.interrupt.is_interrupted", return_value=False), \
+             patch("model_tools._run_async", side_effect=_run_async_immediately), \
+             patch("tools.send_message_tool._send_to_platform", new=AsyncMock(return_value={"success": True})) as send_mock, \
+             patch("gateway.mirror.mirror_to_session", return_value=True):
+            result = json.loads(
+                send_message_tool(
+                    {
+                        "action": "send",
+                        "target": "telegram:Coaching Chat / topic 17585 (group)",
+                        "message": "hello",
+                    }
+                )
+            )
+
+        assert result["success"] is True
+        send_mock.assert_awaited_once_with(
+            Platform.TELEGRAM,
+            telegram_cfg,
+            "-1001",
+            "hello",
+            thread_id="17585",
+            media_files=[],
+        )
+
     def test_media_only_message_uses_placeholder_for_mirroring(self):
         config, telegram_cfg = _make_config()