ldraw-mcp

Name: ldraw-mcp
Author: musharna

by musharnaversion 0.3.1i★ –iRuns on your computer

Registry nameio.github.musharna/ldraw-mcp

Install

Overview

Description from the maker (original English)

Render LDraw/LEGO models to images with real part geometry via headless Blender + ImportLDraw

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: Design, images & audio

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).
You fill in yourself: LDRAW_MCP_BLENDER, LDRAW_LIBRARY_PATH

You need

PyPIPython’s uv installed (for the uvx 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": {
    "ldraw": {
      "command": "uvx",
      "args": [
        "ldraw-mcp"
      ],
      "env": {
        "LDRAW_MCP_BLENDER": "your-value",
        "LDRAW_LIBRARY_PATH": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add ldraw --env LDRAW_MCP_BLENDER=your-value --env LDRAW_LIBRARY_PATH=your-value -- uvx ldraw-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "ldraw": {
      "command": "uvx",
      "args": [
        "ldraw-mcp"
      ],
      "env": {
        "LDRAW_MCP_BLENDER": "your-value",
        "LDRAW_LIBRARY_PATH": "your-value"
      }
    }
  }
}

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": {
    "ldraw": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "ldraw-mcp"
      ],
      "env": {
        "LDRAW_MCP_BLENDER": "your-value",
        "LDRAW_LIBRARY_PATH": "your-value"
      }
    }
  }
}

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.

Values you fill in

LDRAW_MCP_BLENDER env
Path to the Blender binary (overrides PATH lookup).
LDRAW_LIBRARY_PATH env
Path to the LDraw parts library (default ~/.ldraw).

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 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account musharna, 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 Design, images & audioi

More stars than 0% of the other 2764 servers in this category
Published to the registry more recently than 37% of the other 2764 servers in this category
Basic checks equal to or better than 100% of the other 2764 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 ldraw-mcp 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 (0.3.1) reached the registry last month.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Figma Context MCP, Claude Real Video, Figma MCP Server

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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.

ldraw-mcp

Give your MCP client eyes for LEGO® models.

Render LDraw files (.ldr / .mpd / .dat) to images with _real part geometry_ — studs, slopes, window glass — using headless Blender and the ImportLDraw addon. The output looks like a BrickLink Stud.io render, with no GUI anywhere in the loop.

A ~90-line .ldr rendered front-left and rear-right — actual bricks, not a geometric proxy.

Point a vision-capable model at a build and it sees the actual bricks: crossed rotation matrices, floating plates, sunken windows — the kinds of export bugs a geometric proxy render will happily hide.

Quickstart

# 1. install

pip install ldraw-mcp

2. install the LDraw parts library + ImportLDraw addon

ldraw-mcp-setup

3. register with Claude Code

claude mcp add ldraw -- ldraw-mcp

Then ask things like _"render output/build.ldr and tell me what looks wrong"_ — the model sees the render, not just the text.

Blender is a prerequisite (see Requirements); it is

not installed by ldraw-mcp-setup.

Tools

tool	what it does
`render_ldraw_file(path, azimuths="-60,120", resolution=640, samples=24)`	Render a model file to a PNG (multi-view, stitched side by side)
`render_ldraw_text(ldr, azimuths="-60,120", resolution=640, samples=24)`	Render inline LDraw content without writing a file first
`check_renderer()`	Diagnose the Blender / addon / parts-library setup
`bill_of_materials(path="", ldr="")`	Part × colour × quantity rows for a model file or inline text
`lookup_color(query)`	Colour code ↔ name / RGB / edge / alpha from `LDConfig.ldr`
`search_parts(query, limit=50)`	Library parts whose description or file name contains `query`

azimuths is a comma-separated list of view angles in degrees; each is rendered and the views are stitched horizontally. Elevation is fixed at 22°. Higher samples = cleaner but slower.

The three query tools are read-only and need no Blender. bill_of_materials expands MPD sub-models (and sibling .ldr/.mpd files next to the model) with their multiplicity, and resolves colour 16 to the colour of the referencing line; colour 24 (edge) is reported as 24. It counts without a parts library — descriptions and colour names are then null. A colour code LDConfig.ldr does not define is listed under unknown_color_codes, a part the library lacks under parts_not_in_library; neither is dropped. A sub-model reference cycle is an error that names the cycle. lookup_color and search_parts need the library (ldraw-mcp-setup).

Requirements

Blender 4.x on PATH, or point LDRAW_MCP_BLENDER at the binary. Install it yourself (package manager, blender.org, or a local build); ldraw-mcp-setup does not install Blender.
ImportLDraw addon (io_scene_importldraw) in Blender's addons dir — installed by ldraw-mcp-setup.
LDraw parts library at ~/.ldraw (or LDRAW_LIBRARY_PATH) — installed by ldraw-mcp-setup.

Environment variables

var	meaning
`LDRAW_MCP_BLENDER`	Path to the blender binary (overrides `PATH` lookup)
`LDRAW_MCP_DISABLE`	Set to `1` to force `is_available()` to `False`
`LDRAW_LIBRARY_PATH`	Path to the LDraw parts library (community convention)

Manual setup

If ldraw-mcp-setup can't detect things automatically:

LDraw library: download complete.zip and unzip so that ~/.ldraw/parts/ exists.
ImportLDraw addon: download the latest release from TobyLobster/ImportLDraw and install it via _Blender > Preferences > Add-ons > Install_, or unzip into ~/.config/blender/ /scripts/addons/io_scene_importldraw/. (Launch Blender once first so the config directory exists.)

Troubleshooting

`check_renderer` says NOT FOUND: run ldraw-mcp-setup, or set the relevant env var above.
No GPU / WSL2 / containers: rendering uses Cycles on CPU, which works headless everywhere — no GPU or display needed. A ~150-part model takes a few seconds at the default 640px / 24 samples.
"no mesh objects imported": the addon couldn't resolve parts — usually a wrong or incomplete LDraw library path. Re-run setup or check LDRAW_LIBRARY_PATH.
Addon not enabled: the render script enables it automatically per run; if a manual Blender session complains, enable io_scene_importldraw in Preferences > Add-ons.

Provenance

This renderer was extracted from the prompt2brick project, where it started life as the vision critic's "see the actual model" path. prompt2brick keeps its own vendored copy of the render wrapper and Blender script, but this repo is the canonical source going forward — fixes and improvements to the renderer should land here first and be ported back into prompt2brick.

License

MIT — see LICENSE.

LEGO® is a trademark of the LEGO Group, which does not sponsor, authorize, or endorse this project. This tool is not affiliated with the LEGO Group, BrickLink, or the LDraw.org organization.

ldraw-mcp

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

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 Design, images & audioi

Common questions

Alternatives

Figma Context MCP

Claude Real Video

Figma MCP Server

README from the maker

ldraw-mcp

Quickstart

2. install the LDraw parts library + ImportLDraw addon

3. register with Claude Code

Tools

Requirements

Environment variables

Manual setup

Troubleshooting

Provenance

License