IGPAPI
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    Variable DirectThreadInputSchemaConst

    DirectThreadInputSchema: Union<
        readonly [
            Struct<
                {
                    kind: Literal<"thread">;
                    peerUserIds: $Array<String>;
                    send_attribution: optionalKey<String>;
                    thread_id: String;
                    thread_v2_id: String;
                },
            >,
            Struct<
                {
                    kind: Literal<"recipient">;
                    recipient: String;
                    send_attribution: optionalKey<String>;
                    seq_id: Number;
                },
            >,
        ],
    > = ...

    What a thread is opened with, a sum of its two entries:

    • thread: a conversation that exists, opened from the inbox list or from the profile's Message button — its v2 id and the peers the opener named;
    • recipient: a person the inbox's "New message" picker chose. The participant lookup's answer decides what is shown: a thread there is opened from the answer (the 1:1 recording's hidden, empty conversation), a conversation the account never had is the composer — the case no recording shows. seq_id is required — it is the inbox sequence the picker row carried and the lookup sends it as seq_id, with no invented fallback; send_attribution is the attribution the message reports (direct_thread_creation_omnipicker from the picker, message_button from the profile, inbox from a thread the inbox opened).