chore(hook): Add feature control

backend/onyx/configs/app_configs.py

@@ -1042,6 +1042,8 @@ POD_NAMESPACE = os.environ.get("POD_NAMESPACE")
 
 DEV_MODE = os.environ.get("DEV_MODE", "").lower() == "true"
 
+HOOK_ENABLED = os.environ.get("HOOK_ENABLED", "").lower() == "true"
+
 INTEGRATION_TESTS_MODE = os.environ.get("INTEGRATION_TESTS_MODE", "").lower() == "true"
 
 #####

backend/onyx/hooks/api_dependencies.py

@@ -0,0 +1,26 @@
+from onyx.configs.app_configs import HOOK_ENABLED
+from onyx.error_handling.error_codes import OnyxErrorCode
+from onyx.error_handling.exceptions import OnyxError
+from shared_configs.configs import MULTI_TENANT
+
+
+def require_hook_enabled() -> None:
+    """FastAPI dependency that gates all hook management endpoints.
+
+    Hooks are only available in single-tenant / self-hosted deployments with
+    HOOK_ENABLED=true explicitly set. Two layers of protection:
+      1. MULTI_TENANT check — rejects even if HOOK_ENABLED is accidentally set true
+      2. HOOK_ENABLED flag — explicit opt-in by the operator
+
+    Use as: Depends(require_hook_enabled)
+    """
+    if MULTI_TENANT:
+        raise OnyxError(
+            OnyxErrorCode.NOT_FOUND,
+            "Custom code hooks are not available in multi-tenant deployments",
+        )
+    if not HOOK_ENABLED:
+        raise OnyxError(
+            OnyxErrorCode.NOT_FOUND,
+            "Custom code hooks are not enabled. Set HOOK_ENABLED=true to enable.",
+        )

backend/tests/unit/onyx/hooks/test_api_dependencies.py

@@ -0,0 +1,40 @@
+"""Unit tests for the hooks feature gate."""
+
+from unittest.mock import patch
+
+import pytest
+
+from onyx.error_handling.error_codes import OnyxErrorCode
+from onyx.error_handling.exceptions import OnyxError
+from onyx.hooks.api_dependencies import require_hook_enabled
+
+
+class TestRequireHookEnabled:
+    def test_raises_when_multi_tenant(self) -> None:
+        with (
+            patch("onyx.hooks.api_dependencies.MULTI_TENANT", True),
+            patch("onyx.hooks.api_dependencies.HOOK_ENABLED", True),
+        ):
+            with pytest.raises(OnyxError) as exc_info:
+                require_hook_enabled()
+        assert exc_info.value.error_code is OnyxErrorCode.NOT_FOUND
+        assert exc_info.value.status_code == 404
+        assert "multi-tenant" in exc_info.value.detail
+
+    def test_raises_when_flag_disabled(self) -> None:
+        with (
+            patch("onyx.hooks.api_dependencies.MULTI_TENANT", False),
+            patch("onyx.hooks.api_dependencies.HOOK_ENABLED", False),
+        ):
+            with pytest.raises(OnyxError) as exc_info:
+                require_hook_enabled()
+        assert exc_info.value.error_code is OnyxErrorCode.NOT_FOUND
+        assert exc_info.value.status_code == 404
+        assert "HOOK_ENABLED" in exc_info.value.detail
+
+    def test_passes_when_enabled_single_tenant(self) -> None:
+        with (
+            patch("onyx.hooks.api_dependencies.MULTI_TENANT", False),
+            patch("onyx.hooks.api_dependencies.HOOK_ENABLED", True),
+        ):
+            require_hook_enabled()  # must not raise