{
"name": "missing-top-reference",
"description": "A missing top reference is represented by a phantom and pruned from public output.",
"spec": {
"source": "JWZ",
"url": "https://www.jwz.org/doc/threading.html",
"behavior": "referenced ancestors without local messages become phantom containers"
},
"input": [
{
"id": "<reply@example>",
"message_id": "<reply@example>",
"in_reply_to": "<missing-root@example>",
"references": [
"<missing-root@example>"
],
"subject": "Re: Hello",
"date": "2026-05-15T09:05:00Z"
},
{
"id": "<second-reply@example>",
"message_id": "<second-reply@example>",
"in_reply_to": "<reply@example>",
"references": [
"<missing-root@example>",
"<reply@example>"
],
"subject": "Re: Hello",
"date": "2026-05-15T09:10:00Z"
}
],
"expected": {
"threads": [
{
"root": "<reply@example>",
"messages": [
"<reply@example>",
"<second-reply@example>"
]
}
]
}
}