diff --git a/studio/backend/core/inference/tools.py b/studio/backend/core/inference/tools.py
index 328f2a73a6..b1024c7e86 100644
--- a/studio/backend/core/inference/tools.py
+++ b/studio/backend/core/inference/tools.py
@@ -554,6 +554,7 @@ TERMINAL_TOOL = {
     },
 }
 
+
 # Lazy import: don't pull rag stack on inference paths that never see RAG.
 def _get_rag_tool_spec():
     from core.rag.tool import SEARCH_KNOWLEDGE_BASE_TOOL
diff --git a/studio/backend/tests/test_desktop_auth.py b/studio/backend/tests/test_desktop_auth.py
index 76881c5d4a..0c4f9dcc40 100644
--- a/studio/backend/tests/test_desktop_auth.py
+++ b/studio/backend/tests/test_desktop_auth.py
@@ -265,9 +265,9 @@ def test_consume_refresh_token_concurrent_only_one_succeeds(tmp_path, monkeypatc
         results = list(pool.map(attempt, range(workers)))
 
     successes = [r for r in results if r is not None]
-    assert len(successes) == 1, (
-        f"expected exactly one consumer to win, got {len(successes)}"
-    )
+    assert (
+        len(successes) == 1
+    ), f"expected exactly one consumer to win, got {len(successes)}"
     assert successes[0] == (storage.DEFAULT_ADMIN_USERNAME, False)
 
 
diff --git a/studio/backend/tests/test_safetensors_tool_loop.py b/studio/backend/tests/test_safetensors_tool_loop.py
index 5c0a3c61b7..82bceacaf8 100644
--- a/studio/backend/tests/test_safetensors_tool_loop.py
+++ b/studio/backend/tests/test_safetensors_tool_loop.py
@@ -508,9 +508,9 @@ class TestLoopBehaviour:
         tool_msgs = [m for m in captured[1] if m.get("role") == "tool"]
         assert tool_msgs, "no tool message reached the model"
         for tm in tool_msgs:
-            assert "__IMAGES__" not in tm["content"], (
-                f"sentinel leaked to model: {tm['content']!r}"
-            )
+            assert (
+                "__IMAGES__" not in tm["content"]
+            ), f"sentinel leaked to model: {tm['content']!r}"
 
     def test_image_sentinel_stripped_with_multiple_markers(self):
         # Consecutive sentinels: cut at the first, nothing leaks.
@@ -540,12 +540,12 @@ class TestLoopBehaviour:
         tool_msgs = [m for m in captured[1] if m.get("role") == "tool"]
         assert tool_msgs
         for tm in tool_msgs:
-            assert "__IMAGES__" not in tm["content"], (
-                f"second sentinel leaked: {tm['content']!r}"
-            )
-            assert tm["content"] == "panel", (
-                f"expected payload-only 'panel', got {tm['content']!r}"
-            )
+            assert (
+                "__IMAGES__" not in tm["content"]
+            ), f"second sentinel leaked: {tm['content']!r}"
+            assert (
+                tm["content"] == "panel"
+            ), f"expected payload-only 'panel', got {tm['content']!r}"
 
     def test_tool_execution_error_is_emitted_but_loop_continues(self):
         loop, exec_fn = _make_loop(
@@ -668,9 +668,9 @@ class TestProseMentioningToolCall:
         contents = [e for e in events if e["type"] == "content"]
         assert contents, "expected at least one content event"
         final = contents[-1]["text"]
-        assert "LLM tool" in final, (
-            f"prose mentioning <tool_call> should not be truncated; got {final!r}"
-        )
+        assert (
+            "LLM tool" in final
+        ), f"prose mentioning <tool_call> should not be truncated; got {final!r}"
 
     def test_tool_result_with_tool_call_text_does_not_retrigger(self):
         # Tool result text contains the literal ``<tool_call>`` string.