diff --git a/studio/backend/run.py b/studio/backend/run.py
index d0d279ce04..8e4f34f45c 100644
--- a/studio/backend/run.py
+++ b/studio/backend/run.py
@@ -1363,7 +1363,6 @@ def run_server(
     def _warm_sandbox_probe():
         try:
             from core.inference.sandbox import sandbox_available
-
             sandbox_available()
         except Exception as exc:  # never let the probe crash server startup
             logger.debug("sandbox availability probe failed at startup: %s", exc)
diff --git a/studio/backend/tests/test_sandbox.py b/studio/backend/tests/test_sandbox.py
index 81389460ef..3724704ae0 100644
--- a/studio/backend/tests/test_sandbox.py
+++ b/studio/backend/tests/test_sandbox.py
@@ -59,7 +59,10 @@ def sandboxed_workdir(tmp_path, monkeypatch):
         # that flag is set, an unavailable sandbox here is a real regression, so
         # fail. Otherwise (local dev, or a runner that genuinely cannot create
         # unprivileged user namespaces) skip rather than turn the run red.
-        if os.environ.get("UNSLOTH_STUDIO_SANDBOX_CI_ENFORCE", "").strip().lower() in _TRUTHY_CI_VALUES:
+        if (
+            os.environ.get("UNSLOTH_STUDIO_SANDBOX_CI_ENFORCE", "").strip().lower()
+            in _TRUTHY_CI_VALUES
+        ):
             pytest.fail(
                 "sandbox unavailable but UNSLOTH_STUDIO_SANDBOX_CI_ENFORCE=1: the "
                 "CI runner confirmed bubblewrap/sandbox-exec works, so this "