IVR Flow Linter

{
    "nodes": [
        {
            "id": "start",
            "type": "Start"
        },
        {
            "id": "welcome",
            "type": "Speak",
            "prompt": "Welcome to the broken flow."
        },
        {
            "id": "ask_account",
            "type": "Ask",
            "prompt": "Please enter your account number."
        },
        {
            "id": "check_balance",
            "type": "SetVar",
            "vars_used": [
                "account_num"
            ],
            "vars_defined": [
                "balance"
            ]
        },
        {
            "id": "dead_end",
            "type": "Speak",
            "prompt": "This is a dead end."
        },
        {
            "id": "orphan_node",
            "type": "Speak",
            "prompt": "I cannot be reached."
        }
    ],
    "edges": [
        {
            "from": "start",
            "to": "welcome"
        },
        {
            "from": "welcome",
            "to": "ask_account"
        },
        {
            "from": "ask_account",
            "to": "check_balance",
            "label": "success"
        },
        {
            "from": "check_balance",
            "to": "dead_end"
        }
    ]
}