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Three.js DevtoolsBLOCK

mcp/dmitriygolub/three-js-devtools
MCP server by dmitriygolub · ai · claude code · cursor · Audited 2026-10-07
⚑ Report / re-scanSource ↗

Three.js MCP server — inspect and edit scenes, materials, shaders, lights in real time from any AI agent

Verdict
BLOCK
Grade
D
Trust score
69 /100
Exposed tools
8 6r · 2w · 0d
Transport
stdio · streamable-http
License
MIT
Stars
116
01

Overview

From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.

[](https://www.npmjs.com/package/threejs-devtools-mcp) [](LICENSE) [](https://github.com/DmitriyGolub/threejs-devtools-mcp/actions) [](https://mcp-marketplace.io/server/io-github-dmitriygolub-threejs-devtools)

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

Read from source at commit 455dd7a3a480OBSERVED · 2026-10-07
02

Connect

Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control.

claude-code (npm)
claude mcp add threejs-devtools-mcp -- npx -y [email protected]
03

Exposed tools (8)

6 read · 2 write · 0 destructive.

ToolRiskDescription
annotated_screenshotread
bridge_statusread
gltf_to_r3fread
scene_exportread
set_dev_portwrite
set_dev_urlwrite
take_screenshotread
texture_previewread
04

Trust audit

BLOCKgrade D · trust 69/100 Do not install this without reading the findings. The audit found something that could harm you or your machine.

LayerWhat it checksResult
L0Provenance & inventoryPASS
L1Static analysis of the codeFAIL
L2Instruction surface (what it tells the agent)PASS
L3Class-specific surfacePASS
L4Behavioural (sandbox)SKIPPED

What the source does

Filesystem
declared (5 observation(s))
Network
declared (5 observation(s))
Shell
declared (2 observation(s))
Dependencies
not all pinned
Secrets in source
none-found

Findings (10)

HIGHCode injection · code.eval_exec · CWE-78, CWE-94, CWE-95
src/bridge/handlers/mutate.ts:247
const fn = new Function('scene', 'renderer', 'camera', 'gl', code);
Why it matters. evaluates text as code
Fix. remove; use a parser or a dispatch table
HIGHCode injection · code.eval_exec · CWE-78, CWE-94, CWE-95
src/browser.ts:41
exec(cmd, () => {});
Why it matters. evaluates text as code
Fix. remove; use a parser or a dispatch table
LOWInventory / provenance · inv.hidden_file · CWE-1104
.mcpbignore
.mcpbignore
Why it matters. hidden member outside the usual dotfiles
Fix. review its purpose
LOWFilesystem / path · fs.traversal · CWE-22, CWE-59
src/bridge/handlers/overlay/details.ts:4
import type { ThreeContext } from '../../types.js';
LOWFilesystem / path · fs.traversal · CWE-22, CWE-59
src/bridge/handlers/overlay/html.ts:4
import type { ThreeContext } from '../../types.js';
LOWFilesystem / path · fs.traversal · CWE-22, CWE-59
src/bridge/handlers/overlay/index.ts:5
import type { Handler, ThreeContext } from '../../types.js';
LOWFilesystem / path · fs.traversal · CWE-22, CWE-59
src/bridge/handlers/overlay/index.ts:6
import { getCaptured } from '../../discovery/state.js';
LOWFilesystem / path · fs.traversal · CWE-22, CWE-59
src/bridge/handlers/overlay/loop.ts:4
import type { ThreeContext } from '../../types.js';
LOWSupply chain · supply.unpinned · CWE-829, CWE-1357
package.json
@modelcontextprotocol/sdk, puppeteer-core, ws, zod, @types/node, @types/ws, tsup, typescript
Why it matters. 8 dependency range(s) float
Fix. pin exact versions or ship a lockfile
INFOInventory / provenance · inv.oversize · CWE-1104
docs/images/annotated.png
docs/images/annotated.png
Why it matters. 1032390 bytes not read

Gates applied: no_behavioural_pass.

Audited 2026-10-07 · audit v0.4.1 · source sha 455dd7a3a480full audit observations/trust-audit/mcp-server/dmitriygolub__three-js-devtools.json · Report an issue / request a re-scan
05

Audit history

Every audit this server has had. A grade with a past is a grade somebody is still checking.

DateSourceVerdictGradeScoreChange
2026-10-07455dd7a3a480BLOCKD69first audit
06

Questions

What is the Three.js Devtools MCP server?

Three.js MCP server — inspect and edit scenes, materials, shaders, lights in real time from any AI agent

What tools does Three.js Devtools expose?

8 in total: 6 read-only, 2 that write, and 0 that can delete or overwrite. Every one is listed on this page with its risk.

Is Three.js Devtools safe to connect to an agent?

No — not without reading the findings first. The audit graded it D (69/100) and found 2 critical or high issues in the source. Each one is listed on this page with the file and line it is on.

What credentials does Three.js Devtools need?

No credential environment variables were found in its source, so it appears to need none.

How does Three.js Devtools run?

It speaks stdio and streamable-http, so it runs as a local process your client starts. It is published on npm as threejs-devtools-mcp at 0.4.1.

How current is this page?

The grade is for one exact copy of the source (455dd7a3a480), read on 2026-10-07. The repository is watched and re-audited when it changes.

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