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io.github.zackpeters93/ugs-mcp

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CNC machine control via Universal G-code Sender. Jog, home, run files with hardware safety tokens.

Code source Documentation

Que pouvez-vous faire avec io.github.zackpeters93/ugs-mcp ?

  • Connection tools — Connect/disconnect UGS to your CNC, troubleshoot serial port issues
  • Status tools — Read machine state, position, feed rate, spindle speed
  • Motion tools (token-protected) — Jog axes, home, return to work zero, run G-code files and macros
  • G-code inspector — Translate G-code to English, safety check, cycle time estimate, tool list

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

PYPI package ugs-mcp
Claude Code 
claude mcp add ugs-mcp -e 'UGS_HOST=<UGS_HOST>' -e 'UGS_PORT=<UGS_PORT>' -e 'MACROS_DIR=<MACROS_DIR>' -e 'RAPID_SPEED_MM_MIN=<RAPID_SPEED_MM_MIN>' -- uvx ugs-mcp==0.1.1
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "ugs-mcp": {
            "command": "uvx",
            "args": [
                "ugs-mcp==0.1.1"
            ],
            "env": {
                "UGS_HOST": "<UGS_HOST>",
                "UGS_PORT": "<UGS_PORT>",
                "MACROS_DIR": "<MACROS_DIR>",
                "RAPID_SPEED_MM_MIN": "<RAPID_SPEED_MM_MIN>"
            }
        }
    }
}

Variables d'environnement

  • UGS_HOST UGS Pendant host address
  • UGS_PORT UGS Pendant port (default: 8080)
  • MACROS_DIR Directory for saved G-code macros
  • RAPID_SPEED_MM_MIN Rapid speed in mm/min used for return-to-zero (default: 5000)

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. ugs-mcp
  2. ⚠️ STOP. READ THIS FIRST.
  3. What it does
  4. Requirements
  5. Installation
  6. Claude Code setup
  7. Claude Desktop setup
  8. Configuration
  9. The token system
  10. Tools
  11. Tested with
  12. License

ugs-mcp

MCP server for controlling CNC machines via Universal GCode Sender.

Lets Claude (or any MCP-compatible AI assistant) connect to a CNC machine, inspect G-code, and issue motion commands — all through the UGS Pendant REST API.

⚠️ STOP. READ THIS FIRST.

This software controls machines that can damage equipment, destroy parts, and injure or kill people.

CNC machines move fast and don't know where your hands are. Before you use this:

If you skim the safety docs and something goes wrong, that's on you. We warned you.

What it does

  • Connection tools — Connect/disconnect UGS to your CNC, troubleshoot serial port issues
  • Status tools — Read machine state, position, feed rate, spindle speed
  • Motion tools (token-protected) — Jog axes, home, return to work zero, run G-code files and macros
  • G-code inspector — Translate G-code to English, safety check, cycle time estimate, tool list

Every motion command uses a two-step token protocol: Claude generates a token, shows it to you, and the machine only moves when you read the token back. Claude cannot bypass this — tokens are generated and validated server-side.

Requirements

  • Universal GCode Sender 2.x (winder.github.io/ugs_website)
  • UGS Pendant plugin installed and active (Tools → Plugins → Installed)
  • Pendant running at http://localhost:8080 (default)
  • Python 3.11+

Installation

Via pip
pip install ugs-mcp
From source
git clone https://github.com/zackpeters93/ugs-mcp.git
cd ugs-mcp
pip install -e .

Claude Code setup

claude mcp add ugs-cnc ugs-mcp

Or from source (without pip install):

claude mcp add ugs-cnc /path/to/ugs-mcp/ugs_mcp/run_server.sh

Claude Desktop setup

In ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "ugs-cnc": {
      "command": "ugs-mcp"
    }
  }
}

Or from source:

{
  "mcpServers": {
    "ugs-cnc": {
      "command": "/opt/homebrew/opt/python@3.11/libexec/bin/python3",
      "args": ["-m", "ugs_mcp.server"],
      "cwd": "/path/to/ugs-mcp"
    }
  }
}

Configuration

Environment variables (all optional):

VariableDefaultDescription
UGS_HOSTlocalhostUGS Pendant host
UGS_PORT8080UGS Pendant port
MACROS_DIRugs_mcp/macros/Directory for saved G-code macros
RAPID_SPEED_MM_MIN5000Rapid speed used in return-to-zero

Copy .env.example to .env to customize.

The token system

Every motion tool uses a mandatory two-step confirmation:

Step 1 — Call the tool without a token. Claude shows you a preview (axis, distance, resulting position, safety warnings) and a token like [A3F8B2C1].

Step 2 — Read the preview. If you agree, tell Claude the token. Claude calls the tool again with confirmation_token="A3F8B2C1". The machine moves.

Tokens are generated server-side via uuid4(), expire in 2 minutes, and are single-use. Claude cannot predict, fabricate, or reuse them. The only way movement happens is if you type the token back.

Tools

See USER_GUIDE.md for the full tool reference with parameters, examples, and typical workflows.

CategoryTools
Connectionugs_connect, ugs_disconnect, ugs_troubleshoot_connection
Statusugs_get_status, ugs_get_job_status
Jobugs_run_file, ugs_pause_job, ugs_cancel_job
Motionugs_jog, ugs_home, ugs_return_to_zero, ugs_set_work_zero
G-codegcode_safety_check, gcode_estimate_time, gcode_translate, gcode_list_tools, gcode_save_macro, gcode_list_macros, gcode_run_macro

Tested with

  • SainSmart Genmitsu 3018 Pro (GRBL)
  • UGS 2.x with Pendant plugin
  • macOS / Python 3.11

Likely works with any GRBL-based machine. TinyG/FluidNC/Smoothieware untested.

License

MIT — see LICENSE.

No warranty. No liability. Read SAFETY.md.

Questions fréquentes

Qu'est-ce que io.github.zackpeters93/ugs-mcp ?

CNC machine control via Universal G-code Sender. Jog, home, run files with hardware safety tokens.

Comment installer io.github.zackpeters93/ugs-mcp ?

Il s'exécute sur votre machine. Dans Claude Code : claude mcp add ugs-mcp -e 'UGS_HOST=<UGS_HOST>' -e 'UGS_PORT=<UGS_PORT>' -e 'MACROS_DIR=<MACROS_DIR>' -e 'RAPID_SPEED_MM_MIN=<RAPID_SPEED_MM_MIN>' -- uvx ugs-mcp==0.1.1. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour io.github.zackpeters93/ugs-mcp ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

io.github.zackpeters93/ugs-mcp est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient io.github.zackpeters93/ugs-mcp ?

Il est publié par zackpeters93. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.