Grasshopper MCP Bridge

MCP serverCommunity

An early Grasshopper bridge: a GH_MCP component with a TCP server plus a Python MCP bridge and a component knowledge base. By alfredatnycu.

103 starsUpdated 2 years agoGitHub data from 5 Nov 2026

At a glance

Type: MCP server
Works with: Rhino 3D & Grasshopper
How it connects: Drives a running copy of the tool
Access: Can modify models
Tool versions: Rhino 7 or later with Grasshopper
Operating systems: Windows
Needs a Rhino 3D & Grasshopper licence: Yes
Transport: Local (stdio)
AI clients documented: Claude Desktop
Licence: MIT
Language: C#

What it can do

Creates and connects Grasshopper components from Claude Desktop.
Turns short descriptions into multi-component patterns using a JSON knowledge base of common components, parameters and connection rules.
Exposes component guidance as resources so the agent connects parameters correctly.

Limitations

No commits since March 2025, so check that it still loads in current Rhino 8 builds.
The setup notes cover Windows paths and Claude Desktop only.
You start the Python bridge yourself and add the GH_MCP component to the canvas each session.

Install

pip install grasshopper-mcp

Source: github.com/alfredatnycu/grasshopper-mcp#installation-instructions

Download GH_MCP.gha from the repository's releases folder and copy it to %APPDATA%\Grasshopper\Libraries\, then add the GH_MCP component to your canvas and run python -m grasshopper_mcp.bridge.

Source: github.com/alfredatnycu/grasshopper-mcp#installation-instructions

MCP servers and skills run code on your computer. Review the source before installing.

AI-generated models, drawings and results must be checked by a qualified engineer before use.