diff --git a/src/langbot/pkg/provider/tools/loaders/native.py b/src/langbot/pkg/provider/tools/loaders/native.py
index 89a4de0b8..201f4c4a1 100644
--- a/src/langbot/pkg/provider/tools/loaders/native.py
+++ b/src/langbot/pkg/provider/tools/loaders/native.py
@@ -757,10 +757,7 @@ class NativeToolLoader(loader.ToolLoader):
         # Sandbox images built from a host rootfs may only ship `python3`, and a
         # read-only /usr prevents creating a `python` shim inside the jail, so
         # resolve the interpreter instead of assuming its name.
-        command = (
-            'PYTHON_BIN=$(command -v python3 || command -v python); '
-            f"\"$PYTHON_BIN\" - <<'PY'\n{script}\nPY"
-        )
+        command = f'PYTHON_BIN=$(command -v python3 || command -v python); "$PYTHON_BIN" - <<\'PY\'\n{script}\nPY'
         result = await self.ap.box_service.execute_tool(
             {
                 'command': command,
diff --git a/tests/unit_tests/provider/test_skill_tools.py b/tests/unit_tests/provider/test_skill_tools.py
index 3ca95b272..29af1a0b4 100644
--- a/tests/unit_tests/provider/test_skill_tools.py
+++ b/tests/unit_tests/provider/test_skill_tools.py
@@ -738,7 +738,6 @@ async def test_native_skill_tools_require_runner_box_binding():
         await loader.invoke_tool('exec', {'command': 'true'}, _make_query())
     ap.box_service.execute_tool.assert_not_awaited()
 
-
     @pytest.mark.asyncio
     async def test_register_skill_hidden_when_cloud_scanning_is_disabled(self):
         from langbot.pkg.provider.tools.loaders.skill_authoring import SkillToolLoader
diff --git a/tests/unit_tests/provider/test_tool_manager_native.py b/tests/unit_tests/provider/test_tool_manager_native.py
index 1940eaa7d..f9f9bb879 100644
--- a/tests/unit_tests/provider/test_tool_manager_native.py
+++ b/tests/unit_tests/provider/test_tool_manager_native.py
@@ -882,4 +882,4 @@ async def test_workspace_file_script_resolves_the_sandbox_interpreter():
     assert result == {'ok': True}
     command = captured['command']
     assert command.startswith('PYTHON_BIN=$(command -v python3 || command -v python)')
-    assert command.endswith(" - <<'PY'\nprint(\"x\")\nPY")
+    assert command.endswith(' - <<\'PY\'\nprint("x")\nPY')