OSError: [Errno 22] Invalid argument

[sentry]

Sentry Issue: DX-CLI-6

ExceptionGroup: unhandled errors in a TaskGroup
(5 additional frame(s) were not displayed)
...
  File "asyncio\runners.py", line 195, in run
    return runner.run(main)
  File "asyncio\runners.py", line 118, in run
    return self._loop.run_until_complete(task)
  File "asyncio\base_events.py", line 725, in run_until_complete
    return future.result()
  File "contextlib.py", line 235, in __aexit__
    await self.gen.athrow(value)
  File "contextlib.py", line 235, in __aexit__
    await self.gen.athrow(value)

OSError: [Errno 22] Invalid argument
(5 additional frame(s) were not displayed)
...
  File "rich\console.py", line 2055, in _check_buffer
    self._write_buffer()
  File "rich\console.py", line 2091, in _write_buffer
    legacy_windows_render(buffer, LegacyWindowsTerm(self.file))
  File "rich\_windows_renderer.py", line 17, in legacy_windows_render
    term.write_styled(text, style)
  File "rich\_win32_console.py", line 441, in write_styled
    self.write_text(text)
  File "rich\_win32_console.py", line 403, in write_text
    self.flush()

ClickException: [Errno 22] Invalid argument
(3 additional frame(s) were not displayed)
...
  File "click\core.py", line 1902, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "click\core.py", line 1298, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "click\core.py", line 853, in invoke
    return callback(*args, **kwargs)
  File "deepctl_core\plugin_manager.py", line 247, in command_func
    return command_instance.execute(ctx, **kwargs)
  File "deepctl_core\base_command.py", line 136, in execute
    raise click.ClickException(str(e))

OSError: [Errno 22] Invalid argument
(7 additional frame(s) were not displayed)
...
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "__main__.py", line 10, in <module>
    sys.exit(main())

[lukeocodes]

There are five more Sentry issues in dx-cli that look like the same Windows compatibility cluster. Worth consolidating into this one rather than tracking separately:

Sentry	Events	Title	Last seen
DX-CLI-6 (this issue)	22	OSError: [Errno 22] Invalid argument on dg mcp	2026-05-15 01:21 UTC
DX-CLI-7	2	OSError: [Errno 22] Invalid argument (variant)	2026-05-16
DX-CLI-8	5	OSError: [Errno 22] Invalid argument (variant)	2026-05-16
DX-CLI-9	1	OSError: [Errno 22] Invalid argument (variant)	2026-05-16
DX-CLI-A	6	UnicodeEncodeError: 'charmap' codec can't encode characters in position 2-17	2026-05-17
DX-CLI-B	1	MarkupError: closing tag with garbled characters	2026-05-17

Common signal across all of them:

• cli.os = windows
• Release deepctl@0.2.24
• Python 3.13.12
• __main__.py:<module> in the in-app frame — fails during entry-point initialization

The pattern is consistent with Windows cp1252 encoding choking on non-ASCII output:

• Errno 22 Invalid argument on Windows often means a path or filename contains a character CreateFileW rejects (NUL, <, >, :, ", |, ?, *, or control chars) — OR a file descriptor flag combination Windows doesn't allow.
• 'charmap' codec can't encode is the canonical Python-on-Windows error when stdout's default encoding (cp1252) hits a non-Latin1 character.
• MarkupError with garbled bytes is what Rich produces when its terminal output gets corrupted mid-tag — likely the same encoding cascade.

If this issue takes a fix, suggest closing the other five Sentry groups as merged. If we want them as separate tracking entries first, the Sentry "merge" action under each one would fold them into DX-CLI-6.

Worth noting dg mcp is in the culprit for DX-CLI-6 specifically — that subcommand is where the failure mode lands most often.