blendmcp 1.4.0

Control Blender from Claude and other LLMs through the Model Context Protocol

MCPBlender - Blender Model Context Protocol Integration

MCPBlender connects Blender to Claude AI through the Model Context Protocol (MCP), allowing Claude to directly interact with and control Blender. This integration enables prompt assisted 3D modeling, scene creation, and manipulation.

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Satish Goda

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Release notes (1.4.0)

• Added Hunyuan3D support

Recent improvements

• Structured editing tools: add_primitive, modify_object, set_material, duplicate_object, and delete_object. These are more reliable than generating raw Python and they return the affected object's bounding box and dimensions so the result is confirmed in one step.
• batch_edit applies many editing operations in a single round trip, with per-operation results, for bulk changes.
• get_blender_status reports the connection state and which integrations are enabled. Call it first if a tool reports a connection problem.
• execute_blender_code now accepts return_screenshot=True to return a viewport image alongside the result, and surfaces the full Python traceback when the code fails so it can be corrected.
• The connection reconnects and retries once after a dropped socket, so restarting Blender mid-session no longer breaks the next call.
• The addon ships inside the package, so blendmcp install-addon keeps it on the same version as the server (a version handshake warns when it drifts).
• Removed the telemetry/data-collection code entirely; this fork sends no usage data.
• See docs/claude-integration-improvements.md for the rationale and the full list of changes.

Previously added features:

• View screenshots for Blender viewport to better understand the scene
• Search and download Sketchfab models
• Support for Poly Haven assets through their API
• Support to generate 3D models using Hyper3D Rodin
• Run the MCP server on a remote host

Installing a new version (existing users)

• For newcomers, you can go straight to Installation. For existing users, see the points below
• The addon now ships inside the blendmcp package, so the server and addon update together. If you installed the server as a uv tool, update both with:

  uv tool upgrade blendmcp
  blendmcp install-addon
  

  Then restart Blender. blendmcp install-addon --list shows detected Blender versions; --all installs into every one, and --blender-version 4.2 targets one.
• Prefer manual? Download the latest src/mcpblender/addon.py and replace the older one in Blender.
• If your MCP client caches the server, remove and re-add it (or restart the client) so it picks up the new version.
• get_blender_status reports the server and addon versions and warns when the addon is out of date.

Features

• Two-way communication: Connect Claude AI to Blender through a socket-based server
• Structured editing tools: Add primitives, transform objects, set materials, duplicate, and delete through dedicated tools that return the affected object's bounding box and dimensions for confirmation
• Object manipulation: Create, modify, and delete 3D objects in Blender
• Material control: Apply and modify materials and colors
• Scene inspection: Get detailed information about the current Blender scene
• Visual feedback: Capture viewport screenshots, including alongside execute_blender_code results
• Code execution: Run arbitrary Python code in Blender from Claude

Components

The system consists of two main components:

1. Blender Addon (addon.py): A Blender addon that creates a socket server within Blender to receive and execute commands
2. MCP Server (src/mcpblender/server.py): A Python server that implements the Model Context Protocol and connects to the Blender addon

Installation

Prerequisites

• Blender 3.0 or newer
• Python 3.10 or newer
• uv package manager:

If you're on Mac, please install uv as

brew install uv

On Windows

powershell -c "irm https://astral.sh/uv/install.ps1 | iex" 

and then add uv to the user path in Windows (you may need to restart Claude Desktop after):

$localBin = "$env:USERPROFILE\.local\bin"
$userPath = [Environment]::GetEnvironmentVariable("Path", "User")
[Environment]::SetEnvironmentVariable("Path", "$userPath;$localBin", "User")

Otherwise installation instructions are on their website: Install uv

⚠️ Do not proceed before installing UV

Environment Variables

The following environment variables can be used to configure the Blender connection:

• BLENDER_HOST: Host address for Blender socket server (default: "localhost")
• BLENDER_PORT: Port number for Blender socket server (default: 9876)

Example:

export BLENDER_HOST='host.docker.internal'
export BLENDER_PORT=9876

Claude for Desktop Integration

Watch the setup instruction video (Assuming you have already installed uv)

Go to Claude > Settings > Developer > Edit Config > claude_desktop_config.json to include the following:

{
    "mcpServers": {
        "blendmcp": {
            "command": "uvx",
            "args": [
                "blendmcp"
            ]
        }
    }
}

Cursor integration

For Mac users, go to Settings > MCP and paste the following

• To use as a global server, use "add new global MCP server" button and paste
• To use as a project specific server, create .cursor/mcp.json in the root of the project and paste

{
    "mcpServers": {
        "blendmcp": {
            "command": "uvx",
            "args": [
                "blendmcp"
            ]
        }
    }
}

For Windows users, go to Settings > MCP > Add Server, add a new server with the following settings:

{
    "mcpServers": {
        "blendmcp": {
            "command": "cmd",
            "args": [
                "/c",
                "uvx",
                "blendmcp"
            ]
        }
    }
}

Cursor setup video

⚠️ Only run one instance of the MCP server (either on Cursor or Claude Desktop), not both

Visual Studio Code Integration

Prerequisites: Make sure you have Visual Studio Code installed before proceeding.

Installing the Blender Addon

The addon ships inside the blendmcp package, so you can install it with one command instead of downloading a file. After installing the server as a uv tool:

uv tool install blendmcp   # if you have not already
blendmcp install-addon

This copies the addon into your Blender add-ons folder (use --list to see detected Blender versions, --all for every version, or --blender-version 4.2 for a specific one). Then open Blender, go to Edit > Preferences > Add-ons, and enable "Interface: Blender MCP". This keeps the addon on the same version as the server, which matters because newer tools require the matching addon.

Manual install (alternative):

1. Download src/mcpblender/addon.py from this repo
2. Open Blender
3. Go to Edit > Preferences > Add-ons
4. Click "Install..." and select the addon.py file
5. Enable the addon by checking the box next to "Interface: Blender MCP"

Usage

Starting the Connection

1. In Blender, go to the 3D View sidebar (press N if not visible)
2. Find the "MCPBlender" tab
3. Turn on the Poly Haven checkbox if you want assets from their API (optional)
4. Click "Connect to Claude"
5. Make sure the MCP server is running in your terminal

Using with Claude

Once the config file has been set on Claude, and the addon is running on Blender, you will see a hammer icon with tools for the Blender MCP.

Capabilities

• Get scene and object information
• Add primitives and create, delete, duplicate and modify shapes through dedicated tools that confirm the result
• Apply or create materials for objects
• Execute any Python code in Blender (optionally returning a viewport screenshot)
• Download the right models, assets and HDRIs through Poly Haven
• AI generated 3D models through Hyper3D Rodin

Example Commands

Here are some examples of what you can ask Claude to do:

• "Create a low poly scene in a dungeon, with a dragon guarding a pot of gold" Demo
• "Create a beach vibe using HDRIs, textures, and models like rocks and vegetation from Poly Haven" Demo
• Give a reference image, and create a Blender scene out of it Demo
• "Generate a 3D model of a garden gnome through Hyper3D"
• "Get information about the current scene, and make a threejs sketch from it" Demo
• "Make this car red and metallic"
• "Create a sphere and place it above the cube"
• "Make the lighting like a studio"
• "Point the camera at the scene, and make it isometric"

Hyper3D integration

Hyper3D's free trial key allows you to generate a limited number of models per day. If the daily limit is reached, you can wait for the next day's reset or obtain your own key from hyper3d.ai and fal.ai.

Troubleshooting

• Connection issues: Make sure the Blender addon server is running, and the MCP server is configured on Claude, DO NOT run the uvx command in the terminal. Sometimes, the first command won't go through but after that it starts working.
• Timeout errors: Try simplifying your requests or breaking them into smaller steps
• Poly Haven integration: Claude is sometimes erratic with its behaviour
• Have you tried turning it off and on again?: If you're still having connection errors, try restarting both Claude and the Blender server

Technical Details

Communication Protocol

The system uses a simple JSON-based protocol over TCP sockets:

• Commands are sent as JSON objects with a type and optional params
• Responses are JSON objects with a status and result or message

Limitations & Security Considerations

• The execute_blender_code tool allows running arbitrary Python code in Blender, which can be powerful but potentially dangerous. Use with caution in production environments. ALWAYS save your work before using it.
• Poly Haven requires downloading models, textures, and HDRI images. If you do not want to use it, please turn it off in the checkbox in Blender.
• Complex operations might need to be broken down into smaller steps

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Development

Tests live in tests/ and run outside Blender. Because addon.py imports bpy (only available inside Blender), tests/conftest.py installs lightweight stand-ins for bpy, mathutils, and requests so the addon's pure helper functions can be imported and tested directly.

Install the dev dependencies and run the suite with uv:

uv sync --group dev
uv run pytest

The current tests cover the geometry helpers used for Sketchfab model size normalization (_combine_world_bounds, _bounds_dimensions, _normalization_scale in addon.py) and the pure helpers and connection behavior in src/mcpblender/server.py (color normalization, environment config loading, reconnect-once-and-retry, structured code-execution errors, and batch color normalization).

Credits and disclaimer

This is a third-party integration and not made by Blender. MCPBlender is a fork of blender-mcp by Siddharth Ahuja, maintained by Owen Kent. It keeps the original MIT license and copyright. Unlike upstream, this fork collects no telemetry.