def unravel_artifacts(rpt_artifact_msg):
    """
    Converts a repeated Artifact field of a protobuf message into a list of names.

    Parameters
    ----------
    rpt_artifact_msg : google.protobuf.pyext._message.RepeatedCompositeContainer
        Repeated Artifact field of a protobuf message.

    Returns
    -------
    list of str
        Names of artifacts.

    """
    return [artifact.key
            for artifact
            in rpt_artifact_msg]