How to intercept the response to a command?

[svaningelgem]

So I was trying to get the information for the "help" command:
I was able to intercept this command being sent to the server (I think) with:

        protocolManager = ProtocolLibrary.getProtocolManager();
        protocolManager.addPacketListener(new PacketAdapter(this, ListenerPriority.HIGHEST, Arrays.asList(
                PacketType.Play.Server.COMMANDS,
                PacketType.Play.Client.CHAT_COMMAND,
                PacketType.Play.Client.CLIENT_COMMAND,
//                PacketType.Play.Client.CHAT_COMMAND_SIGNED,
                PacketType.Play.Server.COMMANDS,
                PacketType.Play.Client.CHAT,
                PacketType.Play.Server.CHAT
        )) {
            @Override
            public void onPacketSending(PacketEvent event) {
                System.out.println(">>> [onPacketSending] Packet event found: " + event.getPacketType());
            }

            @Override
            public void onPacketReceiving(PacketEvent event) {
                System.out.println(">>> [onPacketReceiving] Packet event found: " + event.getPacketType());
            }
        });

When I issue the "/help" command however, I do get:

[07:22:09 INFO]: [Plugin] [STDOUT] >>> [onPacketReceiving] Packet event found: CHAT_COMMAND[class=ServerboundChatCommandPacket, id=4]
[07:22:09 INFO]: Missue issued server command: /help

But I don't see anything else in the output.

The help command in spigot does this (in 1.20.4 at least):

[.. building the header & pages stringbuilder ..]
            sender.sendMessage(header.toString());
            sender.sendMessage(page.getLines());

So I was wondering what I need to intercept to be able to read the output...

Thanks!

[svaningelgem]

To answer my own question, and for future reference: there is also a PacketType.Play.Server.SYSTEM_CHAT. That's what I needed here.