What is Three.js DevTools MCP?

Inspect and edit Three.js scenes, materials, shaders, lights in real time from any AI agent

How do I install Three.js DevTools MCP?

Clone Three.js DevTools MCP from https://github.com/DmitriyGolub/threejs-devtools-mcp and configure it as an MCP server in your client (Claude Desktop, Cursor, or VS Code).

Is Three.js DevTools MCP open source?

Yes, Three.js DevTools MCP is open source under the MIT license. Source code is available at https://github.com/DmitriyGolub/threejs-devtools-mcp.

What category does Three.js DevTools MCP belong to?

Three.js DevTools MCP is listed under AI & ML MCP servers on MCPFind.

Three.js DevTools MCP — MCP Server for AI & ML

threejs-devtools-mcp

MCP server for inspecting and modifying Three.js scenes in real time — 59 tools for objects, materials, shaders, textures, animations, performance monitoring, memory diagnostics, and code generation.

Zero changes to your project. Works with vanilla Three.js, React Three Fiber, and any framework.

Setup

1. Add the MCP server

Claude Code

claude mcp add threejs-devtools-mcp -- npx threejs-devtools-mcp

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "threejs-devtools-mcp": {
      "command": "npx",
      "args": ["-y", "threejs-devtools-mcp"]
    }
  }
}

Cursor

Add to .cursor/mcp.json in your project:

{
  "mcpServers": {
    "threejs-devtools-mcp": {
      "command": "npx",
      "args": ["-y", "threejs-devtools-mcp"]
    }
  }
}

Or use the HTTP transport — see Cursor setup guide.

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "threejs-devtools-mcp": {
      "command": "npx",
      "args": ["-y", "threejs-devtools-mcp"]
    }
  }
}

VS Code (Copilot)

Add to .vscode/mcp.json:

{
  "servers": {
    "threejs-devtools-mcp": {
      "command": "npx",
      "args": ["-y", "threejs-devtools-mcp"]
    }
  }
}

OpenCode

Add to opencode.json in your project:

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "threejs-devtools-mcp": {
      "type": "local",
      "command": ["npx", "-y", "threejs-devtools-mcp"],
      "enabled": true
    }
  }
}

2. Start your dev server and open the browser

Start your Three.js dev server as usual (npm run dev). The MCP server auto-detects the port from package.json and opens a browser at localhost:9222 with the devtools bridge injected.

Keep the browser tab open. The MCP server talks to your scene through a WebSocket bridge. Close the tab = tools stop working.

3. Ask the AI about your scene

"show me the scene tree"
"why is my model invisible?"
"make the car red"
"check for memory leaks"
"what's my FPS?"
"generate a React component from character.glb"

In-browser overlay

A built-in devtools panel with live performance stats, interactive scene graph, material editor, and 3D object preview. Activated automatically or via the toggle_overlay tool.

Tip: name your objects

Unnamed objects show as (unnamed) in the scene tree. Named objects are easier to find and modify:

// Three.js
mesh.name = "player";

// React Three Fiber
<mesh name="player" geometry={geometry} material={material} />

Documentation

Tools reference — all 59 tools with parameters
Advanced setup — animations, scene export, configuration, transports
Cursor setup — step-by-step guide for Cursor
Token-efficient workflow — best practices for saving context

License

MIT

Set up in your AI client

AI clientOperating system

Merge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.

json

{
  "mcpServers": {
    "io-github-dmitriygolub-threejs-devtools": {
      "command": "npx",
      "args": [
        "-y",
        "threejs-devtools-mcp"
      ]
    }
  }
}

Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.

Claude Desktop setup reference

Compatible MCP Clients

Three.js DevTools MCP works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.

Claude Desktop~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.

Cursor~/.cursor/mcp.jsonRestart Cursor for changes to take effect.

VS Code.vscode/mcp.jsonReload VS Code window for changes to take effect.

Windsurf~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect.

Claude Code.mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.

Three.js DevTools MCP