Function _build_server_env

libs/code/deepagents_code/server.py:323–356

Build the environment dict for the server subprocess. Copies `os.environ`, sets required flags, and strips variables that are not needed or can alter subprocess startup behavior. A launch-time `PYTHONPATH` is captured into `config._INHERITED_PYTHONPATH_ENV` before being stripped, s

()

def _build_server_env() -> dict[str, str]:
    """Build the environment dict for the server subprocess.

    Copies `os.environ`, sets required flags, and strips variables that are not
    needed or can alter subprocess startup behavior.

    A launch-time `PYTHONPATH` is captured into `config._INHERITED_PYTHONPATH_ENV`
    before being stripped, so the value never reaches the server interpreter's
    `sys.path` but can still be re-applied to agent `execute` commands downstream.

    Returns:
        Environment dict for `subprocess.Popen`.
    """
    env = os.environ.copy()
    env["PYTHONDONTWRITEBYTECODE"] = "1"
    env["LANGGRAPH_AUTH_TYPE"] = "noop"

    # Capture a launch-time PYTHONPATH before stripping it. Never trust an
    # inherited carrier var: pop it first, then set it only from the real value.
    env.pop(_INHERITED_PYTHONPATH_ENV, None)
    inherited_pythonpath = os.environ.get("PYTHONPATH")

    for key in (
        "LANGGRAPH_AUTH",
        "LANGGRAPH_CLOUD_LICENSE_KEY",
        "LANGSMITH_CONTROL_PLANE_API_KEY",
        "LANGSMITH_TENANT_ID",
        *_SERVER_ENV_DENYLIST,
    ):
        env.pop(key, None)

    if inherited_pythonpath is not None:
        env[_INHERITED_PYTHONPATH_ENV] = inherited_pythonpath
    return env


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