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fix(browser): strip PYTHONPATH from browser-use child env #84022

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fix(browser): strip PYTHONPATH from browser-use child env #84022

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12 changes: 11 additions & 1 deletion tools/browser_use_cli.py
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,17 @@ def _blocked_url_in_code(code: str) -> Optional[str]:
def _base_subprocess_env() -> dict:
from tools.browser_tool import _build_browser_env

return _build_browser_env()
env = _build_browser_env()
# The browser-use CLI runs in its own Python environment (uv tool /
# uvx), NOT the Hermes venv. Hermes sets PYTHONPATH to its own
# site-packages (see tools/environments/local.py), and a child Python
# interpreter honors it ahead of its own site-packages — on this
# machine that made browser-use import the Hermes venv's
# pydantic_core, a CPython-3.11 binary that a 3.12 interpreter can't
# load (ModuleNotFoundError: pydantic_core._pydantic_core). Strip the
# var so the CLI resolves its own dependencies.
env.pop("PYTHONPATH", None)
return env


def _read_browser_cfg() -> dict:
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