Three.js DevTools MCP

Name: Three.js DevTools MCP
Author: DmitriyGolub

by DmitriyGolubversion 0.2.1i★ –iRuns on your computer

Registry nameio.github.DmitriyGolub/threejs-devtools

Install

Overview

Description from the maker (original English)

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

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: Other

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: DEV_PORT, BRIDGE_PORT, BROWSER, HEADLESS, CHROME_PATH

You need

npmNode.js installed (for the npx 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": {
    "threejs-devtools": {
      "command": "npx",
      "args": [
        "-y",
        "threejs-devtools-mcp"
      ],
      "env": {
        "DEV_PORT": "your-value",
        "BRIDGE_PORT": "your-value",
        "BROWSER": "your-value",
        "HEADLESS": "your-value",
        "CHROME_PATH": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add threejs-devtools --env DEV_PORT=your-value --env BRIDGE_PORT=your-value --env BROWSER=your-value --env HEADLESS=your-value --env CHROME_PATH=your-value -- npx -y threejs-devtools-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": {
    "threejs-devtools": {
      "command": "npx",
      "args": [
        "-y",
        "threejs-devtools-mcp"
      ],
      "env": {
        "DEV_PORT": "your-value",
        "BRIDGE_PORT": "your-value",
        "BROWSER": "your-value",
        "HEADLESS": "your-value",
        "CHROME_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": {
    "threejs-devtools": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "threejs-devtools-mcp"
      ],
      "env": {
        "DEV_PORT": "your-value",
        "BRIDGE_PORT": "your-value",
        "BROWSER": "your-value",
        "HEADLESS": "your-value",
        "CHROME_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

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

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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account DmitriyGolub, 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 Otheri

More stars than 0% of the other 32415 servers in this category
Published to the registry more recently than 4% of the other 32415 servers in this category
Basic checks equal to or better than 100% of the other 32415 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 Three.js DevTools 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 (0.2.1) reached the registry 8 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Safe Fetch

Alternatives

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Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Runs on your computer★ 440MITUpdated 14 months ago

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Remote Desktop Commander

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Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.

Runs in the cloud★ 211Updated yesterday

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Safe Fetch

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MCP server for fetching URLs, safe against SSRF, DNS rebinding, and redirect-to-internal attacks.

Runs on your computerUpdated today

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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.

threejs-devtools-mcp

MCP server for inspecting Three.js scenes in real time, trying changes live in the browser, and turning them into code. 69 tools cover objects, materials, shaders, textures, animation, performance and memory, plus website audits, video frame capture and Playwright helpers.

Zero changes to your project. Works with vanilla Three.js and React Three Fiber, on WebGLRenderer and WebGPURenderer.

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?" "try the car in red" ← live preview, nothing saved "keep it" ← written into your code "audit this site for mobile" "record a 5-second clip at 60 fps"

Look now vs. change the code

Every tool is labelled, so you and the AI always know what touches your files:

	Tools	Your code
Inspect	`scene_tree`, `material_details`, `web_audit`, screenshots…	untouched
Live preview	`set_material_property`, `set_light`, `set_camera`…	untouched; lost on page reload
Debug visual	wireframe, bounding boxes, helpers, overlay	untouched; never needed in code
For code	`pending_changes`, `gltf_to_r3f`	the AI writes this into your source

Every live-preview change is recorded. pending_changes returns each one as before → after with ready-to-paste code (vanilla Three.js and React Three Fiber) and where to find it in your project. revert_changes undoes them in the browser.

For websites and videos

`web_audit`: checks for a blurry canvas (pixel ratio, missing resize), battery drain (rendering while idle or off-screen), heavy textures (oversized, not KTX2), expensive shadows, wrong color space and too many draw calls. Each finding comes with the fix.
`capture_frames`: records a frame sequence for promo clips and reels. Time is virtualised, so the output is perfectly smooth at 30/60 fps even if your scene renders slowly. You get the ffmpeg command for MP4/WebM.

Skills

Ready-made workflows show up as slash commands in Claude Code, Cursor and other clients: inspect-scene, try-look, apply-to-code, web-perf-audit, prepare-video, debug-invisible, playwright-setup.

Playwright & Puppeteer

Three ways to connect, same tools in all of them: your own browser (default), a Chrome launched by the server (HEADLESS / CDP_PORT, shareable with Playwright MCP), or your own tests:

import { attachDevtools, waitForScene, threeCall } from 'threejs-devtools-mcp/playwright';

await attachDevtools(context, { connect: false }); await page.goto('http://localhost:5173'); await waitForScene(page); expect((await threeCall(page, 'object_details', { name: 'Car' })).visible).toBe(true);

See Browsers, Puppeteer & Playwright.

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

Documentation

Tools reference — all 69 tools by mode, skills, parameters
Browsers, Puppeteer & Playwright — connection modes, e2e tests, CI tips
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

Three.js DevTools 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 Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Safe Fetch

README from the maker

threejs-devtools-mcp

Setup

1. Add the MCP server

2. Start your dev server and open the browser

3. Ask the AI about your scene

Look now vs. change the code

For websites and videos

Skills

Playwright & Puppeteer

In-browser overlay

Tip: name your objects

Documentation

License