def convert_tool(tool20):
    tool1x = ToolInformation()
    if "name" in tool20:
        tool1x.title = tool20["name"]
    if "description" in tool20:
        tool1x.description = tool20["description"]
    if "tool_version" in tool20:
        tool1x.version = tool20["tool_version"]
    if "labels" in tool20:
        warn(
            "labels not representable in a STIX 1.x ToolInformation.  Found in %s",
            502, tool20["id"])
        # bug in python_stix prevents using next line of code
        # tool1x.type_ = convert_open_vocabs_to_controlled_vocabs(tool20["labels"], TOOL_LABELS_MAP)
    ttp = TTP(id_=convert_id20(tool20["id"]),
              timestamp=text_type(tool20["modified"]))
    ttp.resource = Resource(tools=Tools([tool1x]))
    if "kill_chain_phases" in tool20:
        process_kill_chain_phases(tool20["kill_chain_phases"], ttp)
    if "object_marking_refs" in tool20:
        for m_id in tool20["object_marking_refs"]:
            ms = create_marking_specification(m_id)
            if ms:
                CONTAINER.add_marking(ttp, ms, descendants=True)
    if "granular_markings" in tool20:
        error(
            "Granular Markings present in '%s' are not supported by stix2slider",
            604, tool20["id"])
    record_id_object_mapping(tool20["id"], ttp)
    return ttp