HeadlessMc

Name: HeadlessMc
Author: headlesshq

by headlesshqversion 0.1.0i★ –iRuns on your computer

Registry nameio.github.headlesshq/headlessmc-mcp

Install

Overview

Description from the maker (original English)

Install, launch and control Minecraft: Java Edition clients and servers, also headless.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "headlessmc": {
      "command": "npx",
      "args": [
        "-y",
        "@headlesshq/headlessmc-mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add headlessmc -- npx -y @headlesshq/headlessmc-mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "headlessmc": {
      "command": "npx",
      "args": [
        "-y",
        "@headlesshq/headlessmc-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "headlessmc": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@headlesshq/headlessmc-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account headlesshq, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32696 servers in this category
Published to the registry more recently than 67% of the other 32696 servers in this category
Basic checks equal to or better than 100% of the other 32696 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is HeadlessMc safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.0) reached the registry 19 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, LexPact UK Contracts

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

HeadlessMc - MCP An MCP server for HeadlessMc : install, launch and control Minecraft: Java Edition from AI agents.

HMC | HMC-Specifics | HMC-Skill

[!WARNING]

This is a prototype. We are looking forward to feedback and feature requests.

With this MCP server, Claude Code, Codex, Cursor and other MCP clients can:

install vanilla, Fabric, Forge and NeoForge versions, Java, and mods from Modrinth (everything HeadlessMc can do),
launch several clients and servers at the same time, optionally headless (no display or GPU, e.g. in CI or Docker), each client in its own profile (game directory with its own mods, config and worlds),
control running clients: read the screen, click buttons, type, chat, run commands, connect to servers, etc.
read the logs of every instance and send console commands to servers.

Setup

Agent	Install
Claude Code	`/plugin install headlessmc-mcp --marketplace headlesshq/headlessmc-mcp`
OpenAI Codex	`codex plugin marketplace add headlesshq/headlessmc-mcp`, then `/plugins`, tab HeadlessMc MCP, Install plugin
GitHub Copilot CLI	`copilot plugin marketplace add headlesshq/headlessmc-mcp`, then `copilot plugin install headlessmc-mcp@headlessmc-mcp`
Cursor	clone this repository and copy `plugin` to `~/.cursor/plugins/local/headlessmc-mcp`, then Developer: Reload Window
Gemini CLI	`gemini extensions install https://github.com/headlesshq/headlessmc-mcp`

For instructions on HeadlessMc itself (installing it, mod testing in CI with MC-Runtime-Test), install the headlessmc-skill as well.

Tools

Tool	Description
`hmc`	Run any HeadlessMc command line, e.g. `version install fabric 1.21.5`, `mod search sodium`, `login`. Long commands keep running, poll them with `hmc_job`.
`hmc_job`	Output and status of a running `hmc` command.
`launch_client`	Install and launch a client (version, loader or profile, headless, offline, server to join, JVM args) and wait until it shows the main menu.
`start_server`	Create and start a Paper/Fabric/Purpur/Forge/NeoForge/vanilla server and wait until it has loaded the world.
`list_profiles`, `create_profile`, `delete_profile`	Manage profiles: client setups with their own game directory.
`list_instances`	All launched clients and servers with their status.
`instance_log`	The latest lines of an instance's output, optionally filtered by a regex.
`server_command`	Write a console command to a server and return what it prints.
`stop_instance`	Quit a client or stop a server (or kill it).
`get_screen`	The current screen as JSON: buttons and text fields with ids, texts, positions.
`get_state`	JSON: in world, dead, screen, and metrics like position, health, dimension, server, ping, TPS, players.
`click`, `set_text`, `press_key`	Interact with the current screen. `click` returns the screen it leads to.
`chat`	Send a chat message or a `/command`.
`connect`, `disconnect`	Join or leave a server.
`wait_for`	Wait for `in_world`, `menu`, `screen:` , `log:` or `exit`.
`game_command`	Run any HMC-Specifics command inside the game (`help`, `metrics`, `render`, `respawn`, commands of other mods).

Resource template: hmc://instances/{id}/log.

Several clients at once

Every running client needs its own game directory, otherwise they overwrite each other's files and share a mods folder. launch_client takes an optional profile: a HeadlessMc profile with its own game directory, created in /client/ if it does not exist. Without a profile, a client uses the default game directory of its version, and if another client of that version is already running there, the MCP server creates a new profile (fabric-1.21.8-2, ...) automatically. Versions, libraries and assets are shared between all profiles. Agents can keep profiles for different setups and add mods to them with mod add mod .

Game Control

Game control works on every Minecraft version and modloader that HMC-Specifics supports (1.7.10 to 26.x, Forge, Fabric, NeoForge). The server downloads the matching HMC-Specifics jar and puts it, together with the version independent hmc-mcp-bridge mod, into the mods folder of the client before launching it.

The root project (src/) is the MCP server, a Quarkus application. It uses HeadlessMc's CDI beans and picocli commands directly, like headlessmc-web. stdout is the MCP channel, so HeadlessMc's console output and progress bars are captured and returned as tool results instead.
`hmc-mcp-bridge` is a mod that is not tied to a Minecraft version. It uses the HMC-Specifics API and starts a small HTTP server on the loopback interface once HMC-Specifics has initialized. The MCP server passes it a random token and a port file with -Dhmc.mcp.token and -Dhmc.mcp.portFile. Without a token the mod does nothing. Command output comes back separately from the game log, and JSON commands make the screen and state machine-readable.

Agents can also control clients you start yourself, with any launcher (the Minecraft Launcher, Prism, MultiMC, your IDE's run configuration, ...). Put two mods into the mods folder:

HMC-Specifics for your Minecraft version and modloader,
hmc-mcp-bridge from the releases, one jar for every version and modloader.

When a game with these mods was not launched by the MCP server, the bridge creates a random token, listens on a free port of 127.0.0.1 and registers the game in headlessmc-mcp/instances/ .json in the user's state directory ($XDG_STATE_HOME, else ~/.local/state on Linux, ~/Library/Application Support on macOS, %LOCALAPPDATA%\state on Windows). The file is only readable by you and is deleted when the game exits. list_instances picks up these registrations, so the game appears as an *attached* instance, and the game tools work as for launched clients. The log comes from logs/latest.log. The MCP server never stops attached games on its own, and they have no console for server_command. Launch the game with -Dhmc.mcp.enabled=false to turn the bridge off.

Asking the user

Some things need the user, not the agent. The MCP server uses elicitation when the MCP client supports it:

Minecraft EULA: start_server asks the user to accept the EULA with a checkbox before a server is started for the first time. Without elicitation support, the agent has to ask and pass acceptEula.
Microsoft login: the login command asks the client to open Microsoft's device code page (URL mode), so the user signs in in their browser and the agent never sees credentials.
Prompts of HeadlessMc commands are shown to the user as a form. Passwords and tokens are never requested, the MCP specification forbids that for form elicitation.
Deleting a profile with its files asks for confirmation.

Long installs and launches send progress notifications, and cancelling a tool call in the client cancels the HeadlessMc command.

Installing

Download the latest release from GitHub Releases:

File	Platform
`headlessmc-mcp.jar`	Any platform with Java 25 or newer: `java -jar headlessmc-mcp.jar`
`headlessmc-mcp-windows-x64.exe`	Windows x64
`headlessmc-mcp-linux-x64`, `headlessmc-mcp-linux-arm64`	Linux (e.g. Ubuntu) x64 and arm64
`headlessmc-mcp-macos-arm64`, `headlessmc-mcp-macos-x64`	macOS on Apple silicon and Intel

Building

Requires JDK 25:

git clone --recurse-submodules https://github.com/headlesshq/headlessmc-mcp.git

cd headlessmc-mcp ./gradlew build

-> build/headlessmc-mcp- -runner.jar (includes the hmc-mcp-bridge mod)

-> hmc-mcp-bridge/build/libs/hmc-mcp-bridge- .jar

native executable for the current platform, needs GraalVM 25 (or add -Dquarkus.native.container-build=true for Linux)

./scripts/build-native.sh

-> build/headlessmc-mcp- -runner

Configuration

Property	Default	Description
`hmc.mcp.specifics.version`	`3.0.1`	HMC-Specifics release to install into clients.
`hmc.mcp.specifics.url`	GitHub releases	Download URL template with `{tag}`, `{mc}` and `{loader}`.
`hmc.files.game-for-each-version`	`true`	Separate game directory per version, so mods folders do not clash.
`hmc.mcp.registry`	`/headlessmc-mcp/instances`	Where games from other launchers register, set it for the game as well.

All HeadlessMc properties (hmc.*) work as well, as system properties or in HeadlessMc's config file.

The hmc-mcp-bridge mod reads hmc.mcp.token, hmc.mcp.portFile, hmc.mcp.host (127.0.0.1), hmc.mcp.port (0, any free port), hmc.mcp.registry and hmc.mcp.enabled (true) from system properties. Without hmc.mcp.token it registers the game for attaching.

Privacy and terms

The MCP server runs locally and sends no telemetry. See the Privacy Policy and the Terms of Use. HeadlessMc - MCP is not an official Minecraft product and is not approved by or associated with Mojang or Microsoft.

HeadlessMc

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

LexPact UK Contracts

README from the maker

Setup

Tools

Several clients at once

Game Control

Asking the user

Installing

Building

-> build/headlessmc-mcp- -runner.jar (includes the hmc-mcp-bridge mod)

-> hmc-mcp-bridge/build/libs/hmc-mcp-bridge- .jar

native executable for the current platform, needs GraalVM 25 (or add -Dquarkus.native.container-build=true for Linux)

-> build/headlessmc-mcp- -runner

Configuration

Privacy and terms