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Three.js DevTools MCP

io.github.DmitriyGolub/threejs-devtools ยท v0.2.1

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

Website Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add threejs-devtools -e DEV_PORT=<DEV_PORT> -e BRIDGE_PORT=<BRIDGE_PORT> -e BROWSER=<BROWSER> -e HEADLESS=<HEADLESS> -e CHROME_PATH=<CHROME_PATH> -- npx -y [email protected]
claude_desktop_config.json
{
  "mcpServers": {
    "threejs-devtools": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "DEV_PORT": "<DEV_PORT>",
        "BRIDGE_PORT": "<BRIDGE_PORT>",
        "BROWSER": "<BROWSER>",
        "HEADLESS": "<HEADLESS>",
        "CHROME_PATH": "<CHROME_PATH>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "threejs-devtools": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "DEV_PORT": "<DEV_PORT>",
        "BRIDGE_PORT": "<BRIDGE_PORT>",
        "BROWSER": "<BROWSER>",
        "HEADLESS": "<HEADLESS>",
        "CHROME_PATH": "<CHROME_PATH>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "threejs-devtools": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "DEV_PORT": "<DEV_PORT>",
        "BRIDGE_PORT": "<BRIDGE_PORT>",
        "BROWSER": "<BROWSER>",
        "HEADLESS": "<HEADLESS>",
        "CHROME_PATH": "<CHROME_PATH>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
DEV_PORT
Optional		Dev server port to proxy (auto-detected from package.json if not set)
BRIDGE_PORT
Optional		Bridge proxy port (default: 9222)
BROWSER
Optional		Set to 'none' to disable auto-opening browser
HEADLESS
Optional		Set to 'true' for headless browser mode (CI)
CHROME_PATH
Optional		Custom Chrome/Edge executable path

Details

Package[email protected] (NPM, stdio)
First published16 Mar 2026
Last updated16 Mar 2026
Registry nameio.github.DmitriyGolub/threejs-devtools

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