Three.js DevTools MCP

Name: Three.js DevTools MCP
Author: DmitriyGolub

by DmitriyGolubversion 0.2.1i★ 130iRuns on your computer

Registry nameio.github.DmitriyGolub/threejs-devtools

How to install

What it does

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

Connects Runs on your computer
Account or key No key needed
Category Other

Install

Pick the AI app you use, then copy the settings.

Passed 3/3 checks · Runs on your computer · ✓ Commands checked Nov 13, 2026

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude, with some setup first

You need a Three.js DevTools MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a Three.js DevTools MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Open the Three.js DevTools MCP site ↗
Done
Open the Claude desktop app’s settings file
SettingsDeveloperEdit Config
Done

Paste these settings and save the file

{
  "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"
      }
    }
  }
}

Paste the key only into the app’s field, never into a chat or to anyone

Done

Quit Claude and open it again
Done
Try it
Use Three.js DevTools MCP and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Three.js DevTools MCP or shows a Three.js DevTools MCP tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect Three.js DevTools MCP yet

Three.js DevTools MCP runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect Three.js DevTools MCP

Steps for Claude →You need a Three.js DevTools MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
Steps for Claude Code →You need a Three.js DevTools MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)
Steps for Cursor →You need a Three.js DevTools MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)
Steps for VS Code →You need a Three.js DevTools MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

B · Others in Other that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Hostinger✓ ChatGPT
World Monitor✓ ChatGPT
Svelte MCP✓ ChatGPT

Works with Claude Code, with some setup first

You need a Three.js DevTools MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a Three.js DevTools MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Open the Three.js DevTools MCP site ↗
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

claude mcp add --scope user 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

Replace “your-value” with your key before pressing Enter

Paste the key only into the app’s field, never into a chat or to anyone

Done

Type /mcp in Claude Code
You should see Three.js DevTools MCP listed as connected
Done
Try it
Use Three.js DevTools MCP and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Three.js DevTools MCP or shows a Three.js DevTools MCP tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

You need a Three.js DevTools MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a Three.js DevTools MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Open the Three.js DevTools MCP site ↗
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Fill in your key
In the Three.js DevTools MCP settings, DEV_PORT, BRIDGE_PORT, BROWSER, HEADLESS, CHROME_PATH is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Three.js DevTools MCP and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Three.js DevTools MCP or shows a Three.js DevTools MCP tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

You need a Three.js DevTools MCP key (create it on the maker’s site) · Install Node.js on your computer first (one time)

Install Node.js
One time only; it works for every server that needs Node.js
Open the Node.js download page ↗
Done
Sign up and create a Three.js DevTools MCP key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Open the Three.js DevTools MCP site ↗
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Fill in your key
In the Three.js DevTools MCP settings, DEV_PORT, BRIDGE_PORT, BROWSER, HEADLESS, CHROME_PATH is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Three.js DevTools MCP and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Three.js DevTools MCP or shows a Three.js DevTools MCP tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use Three.js DevTools MCP💬 Discussion →

For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add --scope user 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

Claude Desktop (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"
      }
    }
  }
}

Cursor (~/.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"
      }
    }
  }
}

VS Code (mcp.json)

{
  "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"
      }
    }
  }
}

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.

At a glance

GitHub stars i: 130
Downloads per weeki: 5,202/wk
Licence i: MIT
Connection: Runs on your computer
Transport: stdio
Latest versioni: 0.2.1
Categoryi: Other
Published to registryi: Mar 16, 2026
Code last changedi: Oct 15, 2026
Maker: DmitriyGolub
Packages: npm: threejs-devtools-mcp
Repo: DmitriyGolub/threejs-devtools-mcp
Website: github.com
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Raycast

All apps, with pros and cons →

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 13, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account DmitriyGolub, which owns the repo
✓ Pass
Still maintained
Code last changed 29 days ago
✓ Pass
Has a licence
Uses MIT
– 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

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Otheri

More stars than 99% of the other 19650 servers in this category
Published to the registry more recently than 3% of the other 19650 servers in this category
Basic checks equal to or better than 100% of the other 19650 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 3 of 3 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 29 days ago, 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: World Monitor, Claude Flow, Windmill

Others in the same category

Servers in the same category from other makers, sorted by stars.

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

World Monitor

Real-time global intelligence on conflict, markets, energy, trade, shipping and cyber. 102 tools.

by koala73Widely used★ 90.6KUpdated today

Runs in the cloud✓ service owner · worldmonitor.app

How to connect

Claude Flow

AI orchestration with hive-mind swarms, neural networks, and 87 MCP tools for enterprise dev.

by ruvnetWidely used↓ 13.5K/wk★ 81.6KUpdated 14 months ago

Runs on your computer

Install

Windmill

Run Windmill scripts and flows and manage jobs, schedules, resources and variables.

by windmill-labsWidely used★ 18.6KUpdated yesterday

Runs in the cloud

How to connect

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

What it does

Install

Install Node.js

Sign up and create a Three.js DevTools MCP key

Open the Claude desktop app’s settings file

Paste these settings and save the file

Quit Claude and open it again

Try it

What you can do instead

Install Node.js

Sign up and create a Three.js DevTools MCP key

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Install Node.js

Sign up and create a Three.js DevTools MCP key

Click this button to open Cursor

Fill in your key

Open the AI chat in Cursor in Agent mode

Try it

Install Node.js

Sign up and create a Three.js DevTools MCP key

Click this button to open VS Code

Fill in your key

Open the AI chat in VS Code in Agent mode

Try it

Installed on your computer

Values you fill in

At a glance

Which apps can use it

Related guides

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

Discussion

User reviews

Compared with others in Otheri

Common questions

Others in the same category

World Monitor

Claude Flow

Windmill

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