From b7dd4b376a096f8e6cc5d08ac5195434955875bf Mon Sep 17 00:00:00 2001
From: Hugo Durand <hugo.durand@langchain.dev>
Date: Tue, 22 Sep 2026 14:38:19 -0400
Subject: [PATCH] feat(cli): tell the managed control plane apart from a
 self-hosted one

---
 libs/cli/langgraph_cli/host_backend.py        |  7 ++++++
 .../cli/tests/unit_tests/test_host_backend.py | 24 +++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/libs/cli/langgraph_cli/host_backend.py b/libs/cli/langgraph_cli/host_backend.py
index b5b64e215..bc9d2b635 100644
--- a/libs/cli/langgraph_cli/host_backend.py
+++ b/libs/cli/langgraph_cli/host_backend.py
@@ -37,6 +37,13 @@ class ControlPlaneEndpoints:
             return cls.from_langsmith_endpoint(langsmith_endpoint)
         return cls(CLOUD_CONTROL_PLANE_URL, CLOUD_DASHBOARD_URL)
 
+    @property
+    def is_cloud(self) -> bool:
+        hostname = urlparse(self.control_plane_url).hostname or ""
+        return hostname == CLOUD_CONTROL_PLANE_HOST or hostname.endswith(
+            f".{CLOUD_CONTROL_PLANE_HOST}"
+        )
+
     @classmethod
     def from_control_plane_url(cls, url: str) -> ControlPlaneEndpoints:
         control_plane_url = url.rstrip("/")
diff --git a/libs/cli/tests/unit_tests/test_host_backend.py b/libs/cli/tests/unit_tests/test_host_backend.py
index 4a3488bcf..cbd6272da 100644
--- a/libs/cli/tests/unit_tests/test_host_backend.py
+++ b/libs/cli/tests/unit_tests/test_host_backend.py
@@ -588,3 +588,27 @@ def test_list_listeners_asks_for_a_full_page():
 
     assert c.list_listeners() == [{"id": "listener-1"}]
     assert seen["url"] == "https://api.example.com/v2/listeners?limit=100"
+
+
+@pytest.mark.parametrize(
+    ("control_plane_url", "expected"),
+    [
+        pytest.param("https://api.host.langchain.com", True, id="cloud"),
+        pytest.param("https://eu.api.host.langchain.com", True, id="cloud_region"),
+        pytest.param("https://dev.api.host.langchain.com", True, id="cloud_dev"),
+        pytest.param("https://smith.example.com/api-host", False, id="self_hosted"),
+        pytest.param(
+            "https://corp.example.com/langsmith/api-host",
+            False,
+            id="self_hosted_prefix",
+        ),
+        pytest.param("http://localhost:8080/api-host", False, id="local"),
+        pytest.param(
+            "https://evil-api.host.langchain.com", False, id="lookalike_needs_a_dot"
+        ),
+    ],
+)
+def test_is_cloud_recognises_the_managed_control_plane(control_plane_url, expected):
+    endpoints = ControlPlaneEndpoints.from_control_plane_url(control_plane_url)
+
+    assert endpoints.is_cloud is expected