● Custom Unknow Command Message ●
A simple plugin that allows users to replace the "Unknown or incomplete command..." message with your own custom message.
Support from: 1.20+

To something like this:

And even support multiple randomized messages:

All customizable by your own taste.
● Installation ●
- Simply download the plugin and drop it in your paper's (or fork) plugins folder.
● Command ●
| Command | Description | Permission |
|---|---|---|
| /cucmreload | Reload the config file | cucm.admin |
● Config ●
| Option | Description | Default |
|---|---|---|
| single-message | The message that will replace the "Unknown or incomplete command..." message | Unknown Command, please use /help for more information. |
| use-multiple-messages | Toggling this option will ignore the single-message and make the plugin chose a random message from the list everytime it is called | false |
| message-list | There is no limit to the number of messages in the list, you can add or remove as much as you want |
● Placeholders ●
There are two types of placeholders you can use in your messages:
Built-in placeholders (always available, even without PlaceholderAPI):
{player}and<player>→ The player's name{displayname}and<displayname>→ The player's display name
PlaceholderAPI placeholders (optional, only if PAPI is installed):
- Use any PAPI tags like
%player_name%,%luckperms_prefix%, etc. - If not installed, these placeholders will not be parsed and will appear as plain text.
- Use any PAPI tags like
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.20, 1.20.1, 1.20.2
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as CustomUnknownCommand-0.3.0.jar — drop this file into the mods folder
- Download size: 6 KB
- Download link checked 9 Sept 2026 — working
These come from our own check of the pack file, not from the source page.
