diff --git a/mcp_servers.d/navi_ui.json b/mcp_servers.d/navi_ui.json
index 6b8626f..d97d5f8 100644
--- a/mcp_servers.d/navi_ui.json
+++ b/mcp_servers.d/navi_ui.json
@@ -1,6 +1,6 @@
 {
   "transport": "streamable_http",
-  "url": "http://localhost:8001/mcp",
+  "url": "http://127.0.0.1:8098/mcp",
   "groups": {
     "ui": ["render_component"]
   },
diff --git a/tests/unit/mcp/test_ui_server.py b/tests/unit/mcp/test_ui_server.py
index 4e113c5..70c13ba 100644
--- a/tests/unit/mcp/test_ui_server.py
+++ b/tests/unit/mcp/test_ui_server.py
@@ -1,6 +1,8 @@
 """Unit tests for the internal navi_ui MCP server."""
 
 import json
+from pathlib import Path
+from urllib.parse import urlparse
 
 import pytest
 
@@ -10,6 +12,36 @@
 from navi.mcp.ui_server.components.registry import ComponentRegistry, discover_components
 
 
+class TestMcpConfigPointsAtTheServedEndpoint:
+    """navi reaches its own navi_ui server the way it reaches any other MCP server:
+    through ``mcp_servers.d/navi_ui.json``. Nothing keeps that file in step with the
+    port ``server.py`` binds, and it drifted to the pre-8099/8098 defaults — the
+    server then failed to connect on every start and ``render_component`` surfaced
+    only as an unregistered phantom in list_tools. Assert the file against the live
+    FastMCP object, not against a second copy of the same setting.
+    """
+
+    @staticmethod
+    def _config() -> dict:
+        root = Path(__file__).resolve().parents[3]
+        return json.loads((root / "mcp_servers.d" / "navi_ui.json").read_text())
+
+    def test_url_is_the_endpoint_the_server_actually_binds(self):
+        from navi.mcp.ui_server import server as server_module
+
+        settings = server_module.mcp.settings
+        expected = f"http://{settings.host}:{settings.port}{settings.streamable_http_path}"
+
+        assert self._config()["url"] == expected
+
+    def test_host_is_the_loopback_literal_the_server_binds(self):
+        """``localhost`` may resolve to ::1; the server binds IPv4 only."""
+        assert urlparse(self._config()["url"]).hostname == "127.0.0.1"
+
+    def test_transport_matches_the_mounted_asgi_app(self):
+        assert self._config()["transport"] == "streamable_http"
+
+
 class TestComponentDiscovery:
     def test_discovers_nested_subclasses(self):
         """Intermediate subclasses of UIComponent must be discovered."""