What is threejs-devtools?

A local Model Context Protocol server for inspecting and editing Three.js scenes while they run. Three.js is a JavaScript library for displaying 3D graphics in a browser.

Use it when debugging or changing Three.js scenes, including their materials, shader code, and lighting, through a local development setup.

It lets an AI agent work with a running 3D scene's materials, shaders, and lights instead of relying only on source-code inspection.

threejs-devtools — MCP server by DmitriyGolub

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add mcp/dmitriygolub/threejs-devtools-mcp/threejs-devtools

Clone the repo

git clone --depth 1 https://github.com/DmitriyGolub/threejs-devtools-mcp

Made for: Claude Code, Codex, Cursor, Gemini CLI, OpenCode.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

threejs-devtools scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

server.json · 16 lines

What it actually says

{
  "threejs-devtools": {
    "command": "npx",
    "args": [
      "-y",
      "threejs-devtools-mcp"
    ],
    "env": {
      "DEV_PORT": "",
      "BRIDGE_PORT": "",
      "BROWSER": "",
      "HEADLESS": "",
      "CHROME_PATH": ""
    }
  }
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 16 lines scan A c89dee8e7fa6

Subscribe to this mod's changes

threejs-devtools is an MCP server published in the GitHub repository DmitriyGolub/threejs-devtools-mcp (88 stars, last pushed 4mo ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Design and UX Game development ai claude-code cursor devtools mcp mcp-server

threejs-devtools

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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