ShellToolMiddleware.before_agent task error on Windows #1503
Description
I wanted to try v3 so installed current jupyter_ai-3.0.0b9-py3-none-any.whl with jupyterlab 4.5.0
However when I try to use chat I get error:
I 2025-11-20 13:38:30.359 LabApp] Build is up to date
[W 2025-11-20 13:38:58.770 ServerApp] 404 GET /api/contents/test.chat?content=0&hash=0&1763642338755 (96750df0d3564d908946692501e3c29e@::1) 2.01ms referer=http://localhost:8888/lab
[W 2025-11-20 13:38:58.803 ServerApp] 404 GET /api/contents/test.chat?content=0&hash=0&1763642338755 (::1): No such file or directory: test.chat
[I 2025-11-20 13:38:58.806 ServerApp] Creating new file in
[I 2025-11-20 13:38:59.108 ServerDocsApp] Initializing room 'text:chat:89f8dd78-c26d-4b24-9a9e-f5b743ba35f2'.
[I 2025-11-20 13:38:59.117 ServerDocsApp] Room 'text:chat:89f8dd78-c26d-4b24-9a9e-f5b743ba35f2' initialized.
[I 2025-11-20 13:38:59.120 ServerDocsApp] Loading content for room ID 'text:chat:89f8dd78-c26d-4b24-9a9e-f5b743ba35f2', found at path: 'test.chat'.
[I 2025-11-20 13:38:59.123 RouterExtension] New chat room detected: text:chat:89f8dd78-c26d-4b24-9a9e-f5b743ba35f2
[I 2025-11-20 13:38:59.132 ServerDocsApp] Loaded content for room ID 'text:chat:89f8dd78-c26d-4b24-9a9e-f5b743ba35f2'.
[I 2025-11-20 13:38:59.136 RouterExtension] Connected chat text:chat:89f8dd78-c26d-4b24-9a9e-f5b743ba35f2 to router
[I 2025-11-20 13:38:59.137 RouterExtension] Registered slash command callback for pattern: refresh-personas
[I 2025-11-20 13:38:59.139 JaiChatCommandsExtension] Attached router observer.
[I 2025-11-20 13:38:59.141 PersonaManagerExtension] Router detected new chat room, initializing persona manager: text:chat:89f8dd78-c26d-4b24-9a9e-f5b743ba35f2
[I 2025-11-20 13:38:59.892 PersonaManagerExtension] Found 1 entry points under 'jupyter_ai.personas'.
[I 2025-11-20 13:38:59.893 PersonaManagerExtension] PENDING: Loading AI persona classes from entry points...
[I 2025-11-20 13:38:59.893 PersonaManagerExtension] - Loaded AI persona class 'JupyternautPersona' from 'jupyter_ai_jupyternaut.jupyternaut.jupyternaut' using entry point 'jupyternaut'.
[I 2025-11-20 13:38:59.894 PersonaManagerExtension] SUCCESS: Loaded 1 AI persona classes from entry points. Time elapsed: 1ms.
[I 2025-11-20 13:38:59.901 PersonaManagerExtension] No .jupyter directory found for loading local personas.
[I 2025-11-20 13:38:59.902 PersonaManagerExtension] Persona classes loaded in chat 'text:chat:89f8dd78-c26d-4b24-9a9e-f5b743ba35f2'.
[I 2025-11-20 13:38:59.902 PersonaManagerExtension] PENDING: Initializing AI personas for chat room 'ac19d5b0-855a-4824-91e0-a17228465311'...
[I 2025-11-20 13:38:59.906 PersonaManagerExtension] - Initialized persona 'Jupyternaut' (ID: 'jupyter-ai-personas::jupyter_ai_jupyternaut::JupyternautPersona').
[I 2025-11-20 13:38:59.907 PersonaManagerExtension] SUCCESS: Initialized 1 AI personas for chat room 'ac19d5b0-855a-4824-91e0-a17228465311'. Time elapsed: 4ms.
[I 2025-11-20 13:38:59.907 PersonaManagerExtension] Personas initialized in chat 'text:chat:89f8dd78-c26d-4b24-9a9e-f5b743ba35f2'.
[W 2025-11-20 13:38:59.908 PersonaManagerExtension] No default persona is set in chat 'text:chat:89f8dd78-c26d-4b24-9a9e-f5b743ba35f2'.
[I 2025-11-20 13:38:59.909 RouterExtension] Registered message callback
[I 2025-11-20 13:39:00.487 ServerDocsApp] Reseting last_modified to 2025-11-20 12:39:00.470013+00:00
Starting shell session failed; cleaning up resources.
Traceback (most recent call last):
File "C:\Python312\Lib\site-packages\langchain\agents\middleware\shell_tool.py", line 554, in _create_resources
session.start()
File "C:\Python312\Lib\site-packages\langchain\agents\middleware\shell_tool.py", line 141, in start
self._process = self._policy.spawn(
^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\site-packages\langchain\agents\middleware\_execution.py", line 136, in spawn
process = _launch_subprocess(
^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\site-packages\langchain\agents\middleware\_execution.py", line 33, in _launch_subprocess
return subprocess.Popen( # noqa: S603
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\subprocess.py", line 1026, in __init__
self._execute_child(args, executable, preexec_fn, close_fds,
File "C:\Python312\Lib\subprocess.py", line 1538, in _execute_child
hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [WinError 2] The system cannot find the file specified
[E 2025-11-20 13:39:10.382 PersonaManagerExtension] Persona 'Jupyternaut' encountered an exception printed below when attempting to stream output.
[E 2025-11-20 13:39:10.382 PersonaManagerExtension] [WinError 2] The system cannot find the file specified
Traceback (most recent call last):
File "C:\Python312\Lib\site-packages\jupyter_ai_persona_manager\base_persona.py", line 243, in stream_message
async for chunk in reply_stream:
File "C:\Python312\Lib\site-packages\jupyter_ai_jupyternaut\jupyternaut\jupyternaut.py", line 172, in create_aiter
async for token, metadata in agent.astream(
File "C:\Python312\Lib\site-packages\langgraph\pregel\main.py", line 2956, in astream
async for _ in runner.atick(
File "C:\Python312\Lib\site-packages\langgraph\pregel\_runner.py", line 410, in atick
_panic_or_proceed(
File "C:\Python312\Lib\site-packages\langgraph\pregel\_runner.py", line 520, in _panic_or_proceed
raise exc
File "C:\Python312\Lib\site-packages\langgraph\pregel\_retry.py", line 137, in arun_with_retry
return await task.proc.ainvoke(task.input, config)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\site-packages\langgraph\_internal\_runnable.py", line 705, in ainvoke
input = await asyncio.create_task(
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\site-packages\langgraph\_internal\_runnable.py", line 473, in ainvoke
ret = await self.afunc(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\site-packages\langchain\agents\middleware\shell_tool.py", line 499, in abefore_agent
return self.before_agent(state, runtime)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\site-packages\langchain\agents\middleware\shell_tool.py", line 494, in before_agent
resources = self._get_or_create_resources(state)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\site-packages\langchain\agents\middleware\shell_tool.py", line 532, in _get_or_create_resources
new_resources = self._create_resources()
^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\site-packages\langchain\agents\middleware\shell_tool.py", line 554, in _create_resources
session.start()
File "C:\Python312\Lib\site-packages\langchain\agents\middleware\shell_tool.py", line 141, in start
self._process = self._policy.spawn(
^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\site-packages\langchain\agents\middleware\_execution.py", line 136, in spawn
process = _launch_subprocess(
^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\site-packages\langchain\agents\middleware\_execution.py", line 33, in _launch_subprocess
return subprocess.Popen( # noqa: S603
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Python312\Lib\subprocess.py", line 1026, in __init__
self._execute_child(args, executable, preexec_fn, close_fds,
File "C:\Python312\Lib\subprocess.py", line 1538, in _execute_child
hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [WinError 2] The system cannot find the file specified
During task with name 'ShellToolMiddleware.before_agent' and id '347460d0-cd36-15d1-3d14-b555184037fe'
[I 2025-11-20 13:39:10.640 ServerDocsApp] Reseting last_modified to 2025-11-20 12:39:10.627814+00:00