Improve UME ops triage APIs and slim fabric path payloads.

Add severity/time filters, exclude missing hosts from aggregates, and default topology paths to compact summary fields for MCP-friendly alarm triage.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/netx-mcp/tests/test_mcp_http.py

@@ -40,6 +40,39 @@ def test_call_query_ume_alarms_forwards_http() -> None:
         assert payload["ok"] is True
 
 
+def test_call_aggregate_ume_alarms_forwards_top_ne() -> None:
+    with patch("netx_mcp.http_tools.http_json") as mock_http:
+        mock_http.return_value = {
+            "ok": True,
+            "data": {"total": 10, "by_severity": [], "by_ne": [], "by_ne_total": 3, "top_ne": 20},
+        }
+        out = call_http_tool("aggregateUmeAlarms", {"top_ne": 20, "severity": "critical"})
+        mock_http.assert_called_once_with(
+            "GET",
+            "/v1/ume/alarms/aggregate",
+            params={"top_ne": 20, "severity": "critical"},
+        )
+        payload = json.loads(out["content"][0]["text"])
+        assert payload["ok"] is True
+        assert payload["data"]["top_ne"] == 20
+
+
+def test_call_find_topology_paths_defaults_summary_detail() -> None:
+    with patch("netx_mcp.http_tools.http_post_json") as mock_post:
+        mock_post.return_value = {"ok": True, "data": {"path_count": 1, "detail": "summary", "paths": []}}
+        out = call_http_tool(
+            "findTopologyPaths",
+            {"from_ume_ne_id": "a", "to_ume_ne_id": "b"},
+        )
+        mock_post.assert_called_once()
+        body = mock_post.call_args[0][1]
+        assert body["detail"] == "summary"
+        assert body["from_ume_ne_id"] == "a"
+        assert body["to_ume_ne_id"] == "b"
+        payload = json.loads(out["content"][0]["text"])
+        assert payload["ok"] is True
+
+
 def test_call_get_ume_ne_requires_id() -> None:
     out = call_http_tool("getUmeNe", {})
     assert out.get("isError") is True