feat: add isolated LeRobot policy module

[TomCC7]

Contribution path

• Small, safe change that does not need a tracking issue
• Stacked on Python-native module runtime PR feat: add isolated Python module runtime #3478

Problem

LeRobot 0.6 requires a Transformers 5 and NumPy <2.3 environment that conflicts with the main DimOS perception and development dependency set. DimOS still needs a live policy module that can consume camera and joint-state observations without installing those packages into the main environment.

Solution

• Add an RPC-only LeRobotPolicyModule host contract backed by the Python-native runtime from feat: add isolated Python module runtime #3478.
• Put LeRobot, Transformers, Torch, runtime tests, and their lockfile in a sibling Python 3.12 project.
• Preserve lazy checkpoint loading, observation validation, ordered joint targets, concurrency control, status, and clean shutdown from feat: LeRobot rollout on openyam #3315.
• Exclude Python-native implementation trees and their virtualenvs from host blueprint discovery and mypy.
• Add a hardware-independent example that launches the real isolated subprocess and calls policy_status over RPC.

The root DimOS dependency lists and root uv.lock are unchanged.

How to Test

CI=1 uv run pytest dimos/robot/test_all_blueprints_generation.py dimos/experimental/robot_policy/lerobot/test_module.py -q

cd dimos/experimental/robot_policy/lerobot/python
uv sync --locked --group tests
uv run --locked --group tests pytest -q
uv run --locked --group tests mypy
cd -

uv run python examples/native-modules/python_lerobot.py
uv run --group lint mypy

Validated locally: 7 host/registry tests and 12 isolated runtime tests passed; root and isolated mypy passed; changed-file pre-commit hooks passed; the real subprocess/RPC smoke example exited successfully.

AI assistance

OpenAI Codex with GPT-5 implemented and validated the change under direct user guidance. The user selected the module structure, RPC-only interface, dependency isolation strategy, and stacked-PR workflow.

Checklist

• I have read and approved the CLA.

[codecov]

❌ 4 Tests Failed:

Tests completed	Failed	Passed	Skipped
3806	4	3802	175

View the top 3 failed test(s) by shortest run time

dimos.codebase_checks.test_no_init_files::test_no_init_files

Stack Traces | 0.021s run time

def test_no_init_files():
        dimos_dir = DIMOS_PROJECT_ROOT / "dimos"
        init_files = sorted(dimos_dir.rglob("__init__.py"))
        # The root dimos/__init__.py is allowed for the porcelain lazy import.
        init_files = [f for f in init_files if f != dimos_dir / "__init__.py"]
        if init_files:
            listing = "\n".join(f"  - {f.relative_to(dimos_dir)}" for f in init_files)
>           raise AssertionError(
                f"Found __init__.py files in dimos/:\n{listing}\n\n"
                "__init__.py files are not allowed because they lead to unnecessary "
                "extraneous imports. Everything should be imported straight from the "
                "source module."
            )
E           AssertionError: Found __init__.py files in dimos/:
E             - .../python/dimos_lerobot/__init__.py
E           
E           __init__.py files are not allowed because they lead to unnecessary extraneous imports. Everything should be imported straight from the source module.

dimos_dir  = PosixPath('.../dimos/dimos/dimos')
init_files = [PosixPath('.../dimos/dimos/dimos/.../python/dimos_lerobot/__init__.py')]
listing    = '  - .../python/dimos_lerobot/__init__.py'

dimos/codebase_checks/test_no_init_files.py:25: AssertionError

dimos.core.test_python_native_end_to_end::test_python_native_rpc_refs_and_restart

Stack Traces | 3.26s run time

+ Exception Group Traceback (most recent call last):
  |   File ".../dimos/dimos/.venv/lib/python3.12........./site-packages/_pytest/runner.py", line 341, in from_call
  |     result: TResult | None = func()
  |                              ^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12........./site-packages/_pytest/runner.py", line 242, in <lambda>
  |     lambda: runtest_hook(item=item, **kwds), when=when, reraise=reraise
  |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/pluggy/_hooks.py", line 512, in __call__
  |     return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
  |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/pluggy/_manager.py", line 120, in _hookexec
  |     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
  |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 167, in _multicall
  |     raise exception
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 139, in _multicall
  |     teardown.throw(exception)
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/_pytest/threadexception.py", line 92, in pytest_runtest_call
  |     yield from thread_exception_runtest_hook()
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/_pytest/threadexception.py", line 68, in thread_exception_runtest_hook
  |     yield
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 139, in _multicall
  |     teardown.throw(exception)
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/_pytest/unraisableexception.py", line 95, in pytest_runtest_call
  |     yield from unraisable_exception_runtest_hook()
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/_pytest/unraisableexception.py", line 70, in unraisable_exception_runtest_hook
  |     yield
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 139, in _multicall
  |     teardown.throw(exception)
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/_pytest/logging.py", line 846, in pytest_runtest_call
  |     yield from self._runtest_for(item, "call")
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/_pytest/logging.py", line 829, in _runtest_for
  |     yield
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 139, in _multicall
  |     teardown.throw(exception)
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 53, in run_old_style_hookwrapper
  |     return result.get_result()
  |            ^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12............/site-packages/pluggy/_result.py", line 103, in get_result
  |     raise exc.with_traceback(tb)
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 38, in run_old_style_hookwrapper
  |     res = yield
  |           ^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 139, in _multicall
  |     teardown.throw(exception)
  |   File ".../dimos/dimos/.venv/lib/python3.12.../site-packages/_pytest/capture.py", line 898, in pytest_runtest_call
  |     return (yield)
  |             ^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 139, in _multicall
  |     teardown.throw(exception)
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 53, in run_old_style_hookwrapper
  |     return result.get_result()
  |            ^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12............/site-packages/pluggy/_result.py", line 103, in get_result
  |     raise exc.with_traceback(tb)
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 38, in run_old_style_hookwrapper
  |     res = yield
  |           ^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 139, in _multicall
  |     teardown.throw(exception)
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 53, in run_old_style_hookwrapper
  |     return result.get_result()
  |            ^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12............/site-packages/pluggy/_result.py", line 103, in get_result
  |     raise exc.with_traceback(tb)
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 38, in run_old_style_hookwrapper
  |     res = yield
  |           ^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 139, in _multicall
  |     teardown.throw(exception)
  |   File ".../dimos/dimos/.venv/lib/python3.12.../site-packages/_pytest/skipping.py", line 257, in pytest_runtest_call
  |     return (yield)
  |             ^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 121, in _multicall
  |     res = hook_impl.function(*args)
  |           ^^^^^^^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12........./site-packages/_pytest/runner.py", line 174, in pytest_runtest_call
  |     item.runtest()
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/_pytest/python.py", line 1627, in runtest
  |     self.ihook.pytest_pyfunc_call(pyfuncitem=self)
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/pluggy/_hooks.py", line 512, in __call__
  |     return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
  |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/pluggy/_manager.py", line 120, in _hookexec
  |     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
  |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 167, in _multicall
  |     raise exception
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 139, in _multicall
  |     teardown.throw(exception)
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 53, in run_old_style_hookwrapper
  |     return result.get_result()
  |            ^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12............/site-packages/pluggy/_result.py", line 103, in get_result
  |     raise exc.with_traceback(tb)
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 38, in run_old_style_hookwrapper
  |     res = yield
  |           ^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12.............................................................../site-packages/pluggy/_callers.py", line 121, in _multicall
  |     res = hook_impl.function(*args)
  |           ^^^^^^^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/dimos/.venv/lib/python3.12....../site-packages/_pytest/python.py", line 159, in pytest_pyfunc_call
  |     result = testfunction(**testargs)
  |              ^^^^^^^^^^^^^^^^^^^^^^^^
  |   File ".../dimos/core/test_python_native_end_to_end.py", line 59, in test_python_native_rpc_refs_and_restart
  |     coordinator = ModuleCoordinator.build(
  |                   ^^^^^^^^^^^^^^^^^^^^^^^^
  |   File ".../core/coordination/module_coordinator.py", line 367, in build
  |     coordinator.build_all_modules()
  |   File ".../core/coordination/module_coordinator.py", line 247, in build_all_modules
  |     safe_thread_map(modules, lambda m: m.build())
  |   File ".../dimos/utils/safe_thread_map.py", line 84, in safe_thread_map
  |     raise ExceptionGroup("safe_thread_map failed", errors)
  | ExceptionGroup: safe_thread_map failed (1 sub-exception)
  +-+---------------- 1 ----------------
    | dimos.protocol.rpc.rpc_utils.RemoteError: [Remote builtins.RuntimeError] Python-native environment preparation failed (exit 1): Using CPython 3.12.3 interpreter at: ........./usr/bin/python3
    | Creating virtual environment at: .venv
    | Resolved 182 packages in 1.08s
    | error: The lockfile at `uv.lock` needs to be updated, but `--locked` was
    |        provided.
    | 
    | hint: To update the lockfile, run `uv lock`.
    | 
    | Remote traceback:
    | Traceback (most recent call last):
    |   File ".../protocol/rpc/pubsubrpc.py", line 280, in execute_and_respond
    |     response = f(*args[0], **args[1])
    |                ^^^^^^^^^^^^^^^^^^^^^^
    |   File ".../protocol/rpc/spec.py", line 116, in override_f
    |     return getattr(module, fname)(*args, **kwargs)
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |   File ".../dimos/core/python_native_module.py", line 247, in build
    |     self._run_prepare()
    |   File ".../dimos/core/python_native_module.py", line 163, in _run_prepare
    |     raise RuntimeError(
    | RuntimeError: Python-native environment preparation failed (exit 1): Using CPython 3.12.3 interpreter at: ........./usr/bin/python3
    | Creating virtual environment at: .venv
    | Resolved 182 packages in 1.08s
    | error: The lockfile at `uv.lock` needs to be updated, but `--locked` was
    |        provided.
    | 
    | hint: To update the lockfile, run `uv lock`.
    | 
    | 
    | The above exception was the direct cause of the following exception:
    | 
    | Traceback (most recent call last):
    |   File ".../dimos/utils/safe_thread_map.py", line 68, in safe_thread_map
    |     outcomes[idx] = fut.result()
    |                     ^^^^^^^^^^^^
    |   File "........./usr/lib/python3.12....../concurrent/futures/_base.py", line 449, in result
    |     return self.__get_result()
    |            ^^^^^^^^^^^^^^^^^^^
    |   File "........./usr/lib/python3.12....../concurrent/futures/_base.py", line 401, in __get_result
    |     raise self._exception
    |   File "........./usr/lib/python3.12.../concurrent/futures/thread.py", line 58, in run
    |     result = self.fn(*self.args, **self.kwargs)
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |   File ".../core/coordination/module_coordinator.py", line 247, in <lambda>
    |     safe_thread_map(modules, lambda m: m.build())
    |                                        ^^^^^^^^^
    |   File ".../dimos/core/rpc_client.py", line 93, in __call__
    |     result, unsub_fn = self._rpc.call_sync(
    |                        ^^^^^^^^^^^^^^^^^^^^
    |   File ".../protocol/rpc/spec.py", line 88, in call_sync
    |     raise result
    | RuntimeError: Python-native environment preparation failed (exit 1): Using CPython 3.12.3 interpreter at: ........./usr/bin/python3
    | Creating virtual environment at: .venv
    | Resolved 182 packages in 1.08s
    | error: The lockfile at `uv.lock` needs to be updated, but `--locked` was
    |        provided.
    | 
    | hint: To update the lockfile, run `uv lock`.
    +------------------------------------

dimos.core.test_python_native_end_to_end::test_example_script_exits_after_printing_results

Stack Traces | 5.21s run time

def test_example_script_exits_after_printing_results() -> None:
        repository = Path(__file__).parents[2]
    
        result = subprocess.run(
            [sys.executable, "examples/external_python_module/run.py"],
            cwd=repository,
            capture_output=True,
            text=True,
            timeout=30,
        )
    
>       assert result.returncode == 0, result.stderr
E       AssertionError:   + Exception Group Traceback (most recent call last):
E           |   File ".../examples/external_python_module/run.py", line 38, in <module>
E           |     run_example()
E           |   File ".../examples/external_python_module/run.py", line 22, in run_example
E           |     coordinator = ModuleCoordinator.build(
E           |                   ^^^^^^^^^^^^^^^^^^^^^^^^
E           |   File ".../core/coordination/module_coordinator.py", line 367, in build
E           |     coordinator.build_all_modules()
E           |   File ".../core/coordination/module_coordinator.py", line 247, in build_all_modules
E           |     safe_thread_map(modules, lambda m: m.build())
E           |   File ".../dimos/utils/safe_thread_map.py", line 84, in safe_thread_map
E           |     raise ExceptionGroup("safe_thread_map failed", errors)
E           | ExceptionGroup: safe_thread_map failed (1 sub-exception)
E           +-+---------------- 1 ----------------
E             | dimos.protocol.rpc.rpc_utils.RemoteError: [Remote builtins.RuntimeError] Python-native environment preparation failed (exit 1): Resolved 182 packages in 76ms
E         error: The lockfile at `uv.lock` needs to be updated, but `--locked` was
E                provided.
E         
E         hint: To update the lockfile, run `uv lock`.
E         
E         Remote traceback:
E         Traceback (most recent call last):
E           File ".../protocol/rpc/pubsubrpc.py", line 280, in execute_and_respond
E             response = f(*args[0], **args[1])
E                        ^^^^^^^^^^^^^^^^^^^^^^
E           File ".../protocol/rpc/spec.py", line 116, in override_f
E             return getattr(module, fname)(*args, **kwargs)
E                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E           File ".../dimos/core/python_native_module.py", line 247, in build
E             self._run_prepare()
E           File ".../dimos/core/python_native_module.py", line 163, in _run_prepare
E             raise RuntimeError(
E         RuntimeError: Python-native environment preparation failed (exit 1): Resolved 182 packages in 76ms
E         error: The lockfile at `uv.lock` needs to be updated, but `--locked` was
E                provided.
E         
E         hint: To update the lockfile, run `uv lock`.
E         
E             | 
E             | The above exception was the direct cause of the following exception:
E             | 
E             | Traceback (most recent call last):
E             |   File ".../dimos/utils/safe_thread_map.py", line 68, in safe_thread_map
E             |     outcomes[idx] = fut.result()
E             |                     ^^^^^^^^^^^^
E             |   File ".............../usr/lib/python3.12........./concurrent/futures/_base.py", line 449, in result
E             |     return self.__get_result()
E             |            ^^^^^^^^^^^^^^^^^^^
E             |   File ".............../usr/lib/python3.12........./concurrent/futures/_base.py", line 401, in __get_result
E             |     raise self._exception
E             |   File ".............../usr/lib/python3.12....../concurrent/futures/thread.py", line 58, in run
E             |     result = self.fn(*self.args, **self.kwargs)
E             |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E             |   File ".../core/coordination/module_coordinator.py", line 247, in <lambda>
E             |     safe_thread_map(modules, lambda m: m.build())
E             |                                        ^^^^^^^^^
E             |   File ".../dimos/core/rpc_client.py", line 93, in __call__
E             |     result, unsub_fn = self._rpc.call_sync(
E             |                        ^^^^^^^^^^^^^^^^^^^^
E             |   File ".../protocol/rpc/spec.py", line 88, in call_sync
E             |     raise result
E             | RuntimeError: Python-native environment preparation failed (exit 1): Resolved 182 packages in 76ms
E         error: The lockfile at `uv.lock` needs to be updated, but `--locked` was
E                provided.
E         
E         hint: To update the lockfile, run `uv lock`.
E             +------------------------------------
E         
E       assert 1 == 0
E        +  where 1 = CompletedProcess(args=['.../dimos/dimos/.venv/bin/python', 'examples/external_python_module/run.py'], returncode=1, stdout='04:24:59.706 [inf][dination/module_coordinator.py] Building the blueprint\n04:24:59.708 [inf][ce/system_configurator/base.py] Pytest run detected: skipping system configuration.\n04:24:59.708 [inf][dination/module_coordinator.py] Starting the modules\n04:25:01.110 [inf][ation/worker_manager_python.py] Worker pool started. n_workers=2\n04:25:02.888 [inf][/coordination/python_worker.py] Deployed module. module=Offset module_id=1 worker_id=1\n04:25:02.897 [inf][/coordination/python_worker.py] Deployed module. module=ExampleExternal module_id=0 worker_id=0\n04:25:02.956 [inf][dination/module_coordinator.py] Transport module=exampleexternal name=value original_name=value topic=/value#std_msgs.Int32 transport=LCMTransport type=dimos.msgs.std_msgs.Int32.Int32\n04:25:02.958 [inf][dination/module_coordinator.py] Transport module=exampleexternal name=doubled original_name=doubled topic=/doubled#std_msgs.Int32 transport=LCMTransport type=dimos.msgs.std_msgs.Int32.Int32\n04:25:03.167 [err][.../protocol/rpc/pubsubrpc.py] Exception in RPC handler for Exampl..._result()\n    |            ^^^^^^^^^^^^^^^^^^^\n    |   File ".............../usr/lib/python3.12........./concurrent/futures/_base.py", line 401, in __get_result\n    |     raise self._exception\n    |   File ".............../usr/lib/python3.12....../concurrent/futures/thread.py", line 58, in run\n    |     result = self.fn(*self.args, **self.kwargs)\n    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n    |   File ".../core/coordination/module_coordinator.py", line 247, in <lambda>\n    |     safe_thread_map(modules, lambda m: m.build())\n    |                                        ^^^^^^^^^\n    |   File ".../dimos/core/rpc_client.py", line 93, in __call__\n    |     result, unsub_fn = self._rpc.call_sync(\n    |                        ^^^^^^^^^^^^^^^^^^^^\n    |   File ".../protocol/rpc/spec.py", line 88, in call_sync\n    |     raise result\n    | RuntimeError: Python-native environment preparation failed (exit 1): Resolved 182 packages in 76ms\nerror: The lockfile at `uv.lock` needs to be updated, but `--locked` was\n       provided.\n\nhint: To update the lockfile, run `uv lock`.\n    +------------------------------------\n').returncode

repository = PosixPath('.../work/dimos/dimos')
result     = CompletedProcess(args=['.../dimos/dimos/.venv/bin/python', 'examples/external_python_module/run.py'], re...d` was\n       provided.\n\nhint: To update the lockfile, run `uv lock`.\n    +------------------------------------\n')

dimos/core/test_python_native_end_to_end.py:98: AssertionError

dimos.codebase_checks.test_no_underscore_assign::test_no_underscore_assignment

Stack Traces | 7.27s run time

def test_no_underscore_assignment():
        """Fail if any file assigns to a bare `_`."""
        dimos_dir = DIMOS_PROJECT_ROOT / "dimos"
        hits = find_underscore_assignments()
        if hits:
            listing = "\n".join(f"  - {p.relative_to(dimos_dir)}:{lineno}" for p, lineno in hits)
>           raise AssertionError(
                f"Found assignment(s) to `_` in dimos/:\n{listing}\n\n"
                "Assigning to `_` is not allowed: it hides an unused variable instead "
                "of removing it. Delete the variable. If you only need the "
                "expression's side effect, evaluate it directly with a call "
                "(`obj.method()`, `getattr(obj, 'attr')`) or log it; a bare attribute "
                "access needs `# noqa: B018`. Tuple unpacking (`a, _ = f()`) is fine "
                "and not flagged by this rule."
            )
E           AssertionError: Found assignment(s) to `_` in dimos/:
E             - core/test_python_native_module.py:39
E           
E           Assigning to `_` is not allowed: it hides an unused variable instead of removing it. Delete the variable. If you only need the expression's side effect, evaluate it directly with a call (`obj.method()`, `getattr(obj, 'attr')`) or log it; a bare attribute access needs `# noqa: B018`. Tuple unpacking (`a, _ = f()`) is fine and not flagged by this rule.

dimos_dir  = PosixPath('.../dimos/dimos/dimos')
hits       = [(PosixPath('.../dimos/dimos/dimos/core/test_python_native_module.py'), 39)]
listing    = '  - core/test_python_native_module.py:39'

dimos/codebase_checks/test_no_underscore_assign.py:55: AssertionError

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[TomCC7]

Superseded by #3315, which now carries the isolated LeRobot implementation directly above #3478 in stack #3498. The adapted implementation uses IsolatedPythonModule, keeps LeRobot dependencies in the sibling runtime project, and has passed the host, isolated-runtime, mypy, pre-commit, and subprocess smoke checks.