feat(ui): turn the Chat UI on by default (#46918)

Co-authored-by: Krrish Dholakia <krrishdholakia@berri.ai>
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

litellm/proxy/ui_crud_endpoints/proxy_setting_endpoints.py

@@ -343,7 +343,7 @@ class UISettings(LiteLLMBaseModel):
     )
 
     enable_chat_ui: bool = Field(
-        default=False,
+        default=True,
         description="If true, shows the Chat page in the UI sidebar, letting users chat with an LLM and connect their own MCP server credentials via OAuth.",
     )
 

tests/unit/proxy/ui_crud_endpoints/test_proxy_setting_endpoints.py

@@ -3771,6 +3771,24 @@ class TestPtuCostAttributionUISetting:
         assert not mock_prisma.db.litellm_uisettings.upsert.called
 
 
+class TestEnableChatUISetting:
+    def test_chat_ui_is_on_when_nothing_is_stored(self, mock_auth, monkeypatch):
+        TestPtuCostAttributionUISetting._mock_prisma(monkeypatch)
+
+        response = client.get("/get/ui_settings")
+
+        assert response.status_code == 200
+        assert response.json()["values"]["enable_chat_ui"] is True
+
+    def test_admin_can_still_turn_chat_ui_off(self, mock_auth, monkeypatch):
+        TestPtuCostAttributionUISetting._mock_prisma(monkeypatch, stored={"enable_chat_ui": False})
+
+        response = client.get("/get/ui_settings")
+
+        assert response.status_code == 200
+        assert response.json()["values"]["enable_chat_ui"] is False
+
+
 class TestApplyUserBudgetToTeamKeysUISetting:
     """``apply_user_budget_to_team_keys`` mirrors general_settings on every GET.