Vrm Toolkit MCP

Inspect, validate and preview VRM / VRMA files from an AI agent (5 tools, local stdio server).

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Not yet automatically verified

We haven't yet run this listing's install command through our automated sandbox check. This isn't a red flag — we're steadily working through the catalog.

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "vrm-toolkit-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "vrm-toolkit-mcp"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Capabilities & Tool Schemas (5)Self-reported

Inspect callable tools, capabilities, and parameters exposed to AI agents by Vrm Toolkit MCP.

vrm_inspect

Structured JSON: meta (name/author/license and permission fields), humanoid bone map, expressions, polygon/texture statistics

vrm_validate

Finding list: missing required humanoid bones, broken node references, missing meta/license fields, unknown required extensions, configurable size/triangle/texture budgets

vrma_inspect

Tracks, targeted humanoid bones, expression tracks, duration, estimated frame rate

vrma_preview

Applies a VRMA to a VRM and renders a PNG still or a short WebM clip (max 10 s) through local headless Chrome/Edge

vrm_snapshot

Renders a rest-pose PNG with optional expression weights and view presets (front / three-quarter / side / face close-up)

Documentation Overview

vrm-toolkit-mcp

v0.1.1 — npm / GitHub

An MCP (Model Context Protocol) server that lets an AI agent inspect, validate and preview VRM / VRMA files on your machine. Five tools, stdio transport, no network access at runtime.

VRM / VRMAファイルの検品・情報抽出・プレビューをAIエージェントから使えるようにする MCPサーバーです。ツールは5本、stdioトランスポート、実行時のネットワークアクセスなし。

Tools / ツール

Tool	What it does	説明
`vrm_inspect`	Structured JSON: meta (name/author/license and permission fields), humanoid bone map, expressions, polygon/texture statistics	メタ(名前/作者/ライセンス許諾)・ボーン・表情・ポリゴン/テクスチャ規模を構造化出力
`vrm_validate`	Finding list: missing required humanoid bones, broken node references, missing meta/license fields, unknown required extensions, configurable size/triangle/texture budgets	humanoidマッピング欠落・参照切れ・メタ/ライセンス欠落・未知の必須拡張・サイズ超過などの検品リスト
`vrma_inspect`	Tracks, targeted humanoid bones, expression tracks, duration, estimated frame rate	トラック・対象ボーン・表情トラック・尺・フレームレート推定
`vrma_preview`	Applies a VRMA to a VRM and renders a PNG still or a short WebM clip (max 10 s) through local headless Chrome/Edge	VRMAをVRMに適用し、ローカルのヘッドレスChrome/EdgeでPNG静止画または短尺WebM動画を書き出し
`vrm_snapshot`	Renders a rest-pose PNG with optional expression weights and view presets (front / three-quarter / side / face close-up)	表情ウェイトとビュープリセット(正面/斜め/側面/顔アップ)を指定できる静止画スクリーンショット

Structural tools (vrm_inspect, vrm_validate, vrma_inspect) parse the GLB/glTF container directly in Node and need no browser. Rendering tools (vrma_preview, vrm_snapshot) use an already-installed Chromium-based browser via puppeteer-core; nothing is downloaded.

構造系3ツールはNode単体でGLB/glTFを直接パースし、ブラウザ不要。描画系2ツールはインストール済みのChromium系ブラウザをpuppeteer-coreで使います(追加ダウンロードなし)。

Supported inputs: VRM 0.x (extensions.VRM), VRM 1.0 (extensions.VRMC_vrm), VRMA (extensions.VRMC_vrm_animation), GLB container or plain glTF JSON.

Requirements / 動作条件

Node.js 20+
For vrma_preview / vrm_snapshot: a local Chrome or Edge (auto-detected; override with the VRM_TOOLKIT_CHROME environment variable)
Input size budget: 512 MiB by default (VRM_TOOLKIT_MAX_BYTES to override)

Setup / セットアップ

Terminal

claude mcp add vrm-toolkit -- npx -y vrm-toolkit-mcp

Other MCP hosts / その他のMCPホスト: command npx, args ["-y", "vrm-toolkit-mcp"] (stdio).

From source / ソースから:

Terminal

npm install
npm run build
claude mcp add vrm-toolkit -- node /absolute/path/to/vrm-toolkit/dist/main.js

Execution examples / 実行例

Real outputs from the local test run (2026-08-05, file paths shortened). ローカルテスト実行(2026-08-05)の実出力です(パスは短縮表記)。

vrm_inspect

Input: a VRoid Studio-exported VRM 1.0 avatar (15.7 MB).

config.json

{
  "file": { "path": "...\\V1.vrm", "bytes": 15737992, "container": "glb" },
  "vrm": { "specFamily": "vrm1", "specVersion": "1.0" },
  "meta": {
    "name": "V1",
    "authors": ["D"],
    "licenseUrl": "https://vrm.dev/licenses/1.0/",
    "avatarPermission": "onlyAuthor",
    "commercialUsage": "corporation",
    "creditNotation": "required",
    "allowRedistribution": false,
    "modification": "prohibited"
  },
  "humanoid": {
    "mappedBoneCount": 54,
    "bones": [
      { "bone": "hips", "node": 1, "nodeName": "J_Bip_C_Hips" },
      { "bone": "spine", "node": 34, "nodeName": "J_Bip_C_Spine" }
    ],
    "missingRequiredBones": []
  },
  "expressions": { "presetCount": 14, "presets": ["happy", "angry", "sad", "..."] },
  "geometry": {
    "meshCount": 3,
    "totalVertices": 103489,
    "totalTriangles": 33484,
    "perMesh": [
      { "name": "Face (merged)", "vertices": 33640, "triangles": 7308 },
      { "name": "Body (merged)", "vertices": 57128, "triangles": 11548 },
      { "name": "Hair001 (merged)", "vertices": 12721, "triangles": 14628 }
    ]
  },
  "textures": { "imageCount": 26, "totalImageBytes": 8033934, "maxDimension": 2048 },
  "materials": { "materialCount": 17 }
}

(Output truncated for readability; the tool returns the full bone and image lists.)

vrma_inspect

config.json

{
  "file": { "path": "...\\motion-walk-forward.vrma", "bytes": 3268, "container": "glb" },
  "vrma": { "specVersion": "1.0" },
  "humanoid": { "mappedBoneCount": 16, "bones": ["hips", "spine", "chest", "head", "..."] },
  "animation": {
    "animationCount": 1,
    "channelCount": 2,
    "channelsByPath": { "translation": 1, "rotation": 1, "scale": 0, "weights": 0 },
    "totalKeyframes": 62,
    "durationSec": 1.25,
    "fpsEstimate": 24,
    "frameCountEstimate": 31,
    "humanoidBoneTracks": [
      { "bone": "hips", "paths": ["translation"] },
      { "bone": "chest", "paths": ["rotation"] }
    ]
  }
}

vrm_validate

A finding list with stable codes and severities:

config.json

{
  "ok": false,
  "errorCount": 1,
  "warningCount": 1,
  "findings": [
    { "severity": "error", "code": "HUMANOID_REQUIRED_BONE_MISSING",
      "message": "required humanoid bone is not mapped: leftHand (vrm1 required set)" },
    { "severity": "warning", "code": "META_LICENSE_OTHER_URL_MISSING",
      "message": "licenseName is Other but otherLicenseUrl is empty" }
  ]
}

vrm_snapshot / vrma_preview

config.json

{
  "output_path": "...\\v1-three-quarter-snapshot.png",
  "format": "png", "bytes": 194005, "width": 768, "height": 1024,
  "view": "three_quarter", "pose": "rest", "humanoid_bone_count": 54
}

config.json

{
  "output_path": "...\\v1-walk-preview.webm",
  "format": "webm", "bytes": 313597, "width": 768, "height": 768,
  "clip_duration_sec": 1.25, "recorded_duration_sec": 3, "fps": 30
}

Error codes / エラーコード

Every failure is a structured tool error with one of: FILE_NOT_FOUND, SIZE_BUDGET_EXCEEDED, NOT_A_GLB, NOT_A_VRM, NOT_A_VRMA, BROWSER_NOT_FOUND, RENDER_FAILED, OUTPUT_WRITE_FAILED. The server process never crashes on a bad input file.

Privacy / プライバシー

All processing is local. The server opens no network connection, sends no telemetry, and writes only the output files you name. / 処理はすべてローカルです。ネットワーク接続・テレメトリ送信はなく、書き込みは指定した出力ファイルのみです。

Development / 開発

Terminal

npm test   # build + 25 self-verification tests (structural, boundary, headless rendering)

Rendering tests skip with a notice when no local Chrome/Edge is found.

License / ライセンス

MIT (see LICENSE). / MITライセンス(LICENSE参照)。

Read the full README →View source on GitHub →

Related MCP Servers

View all in Developer Tools View all alternatives

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

npm downloads

236

Package downloads in the last 30 days.

Last commit

1mo ago

Most recent push to the default branch.

Tools exposed

Callable tools this server registers over MCP.

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about Vrm Toolkit MCP

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "vrm-toolkit-mcp": { "command": "npx", "args": ["-y","vrm-toolkit-mcp"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

53Quality signal: Good · 53/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20

Documentation & tools25/30

Adoption & activity5/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

Critical 0High 0Medium 0Low 0

Scanned 2d ago via OSV.dev · vrm-toolkit-mcp (npm)

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More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Vrm Toolkit MCP →Install in Claude Desktop Install in Cursor Install in VS Code

Vrm Toolkit MCP

Inspect, validate and preview VRM / VRMA files from an AI agent (5 tools, local stdio server).

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Not yet automatically verified

We haven't yet run this listing's install command through our automated sandbox check. This isn't a red flag — we're steadily working through the catalog.

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "vrm-toolkit-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "vrm-toolkit-mcp"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Capabilities & Tool Schemas (5)Self-reported

Inspect callable tools, capabilities, and parameters exposed to AI agents by Vrm Toolkit MCP.

vrm_inspect

Structured JSON: meta (name/author/license and permission fields), humanoid bone map, expressions, polygon/texture statistics

vrm_validate

Finding list: missing required humanoid bones, broken node references, missing meta/license fields, unknown required extensions, configurable size/triangle/texture budgets

vrma_inspect

Tracks, targeted humanoid bones, expression tracks, duration, estimated frame rate

vrma_preview

Applies a VRMA to a VRM and renders a PNG still or a short WebM clip (max 10 s) through local headless Chrome/Edge

vrm_snapshot

Renders a rest-pose PNG with optional expression weights and view presets (front / three-quarter / side / face close-up)

Documentation Overview

vrm-toolkit-mcp

v0.1.1 — npm / GitHub

An MCP (Model Context Protocol) server that lets an AI agent inspect, validate and preview VRM / VRMA files on your machine. Five tools, stdio transport, no network access at runtime.

Tools / ツール

Tool	What it does	説明
`vrm_inspect`	Structured JSON: meta (name/author/license and permission fields), humanoid bone map, expressions, polygon/texture statistics	メタ(名前/作者/ライセンス許諾)・ボーン・表情・ポリゴン/テクスチャ規模を構造化出力
`vrm_validate`	Finding list: missing required humanoid bones, broken node references, missing meta/license fields, unknown required extensions, configurable size/triangle/texture budgets	humanoidマッピング欠落・参照切れ・メタ/ライセンス欠落・未知の必須拡張・サイズ超過などの検品リスト
`vrma_inspect`	Tracks, targeted humanoid bones, expression tracks, duration, estimated frame rate	トラック・対象ボーン・表情トラック・尺・フレームレート推定
`vrma_preview`	Applies a VRMA to a VRM and renders a PNG still or a short WebM clip (max 10 s) through local headless Chrome/Edge	VRMAをVRMに適用し、ローカルのヘッドレスChrome/EdgeでPNG静止画または短尺WebM動画を書き出し
`vrm_snapshot`	Renders a rest-pose PNG with optional expression weights and view presets (front / three-quarter / side / face close-up)	表情ウェイトとビュープリセット(正面/斜め/側面/顔アップ)を指定できる静止画スクリーンショット

Supported inputs: VRM 0.x (extensions.VRM), VRM 1.0 (extensions.VRMC_vrm), VRMA (extensions.VRMC_vrm_animation), GLB container or plain glTF JSON.

Requirements / 動作条件

Node.js 20+
For vrma_preview / vrm_snapshot: a local Chrome or Edge (auto-detected; override with the VRM_TOOLKIT_CHROME environment variable)
Input size budget: 512 MiB by default (VRM_TOOLKIT_MAX_BYTES to override)

Setup / セットアップ

Terminal

claude mcp add vrm-toolkit -- npx -y vrm-toolkit-mcp

Other MCP hosts / その他のMCPホスト: command npx, args ["-y", "vrm-toolkit-mcp"] (stdio).

From source / ソースから:

Terminal

npm install
npm run build
claude mcp add vrm-toolkit -- node /absolute/path/to/vrm-toolkit/dist/main.js

Execution examples / 実行例

Real outputs from the local test run (2026-08-05, file paths shortened). ローカルテスト実行(2026-08-05)の実出力です(パスは短縮表記)。

vrm_inspect

Input: a VRoid Studio-exported VRM 1.0 avatar (15.7 MB).

config.json

{
  "file": { "path": "...\\V1.vrm", "bytes": 15737992, "container": "glb" },
  "vrm": { "specFamily": "vrm1", "specVersion": "1.0" },
  "meta": {
    "name": "V1",
    "authors": ["D"],
    "licenseUrl": "https://vrm.dev/licenses/1.0/",
    "avatarPermission": "onlyAuthor",
    "commercialUsage": "corporation",
    "creditNotation": "required",
    "allowRedistribution": false,
    "modification": "prohibited"
  },
  "humanoid": {
    "mappedBoneCount": 54,
    "bones": [
      { "bone": "hips", "node": 1, "nodeName": "J_Bip_C_Hips" },
      { "bone": "spine", "node": 34, "nodeName": "J_Bip_C_Spine" }
    ],
    "missingRequiredBones": []
  },
  "expressions": { "presetCount": 14, "presets": ["happy", "angry", "sad", "..."] },
  "geometry": {
    "meshCount": 3,
    "totalVertices": 103489,
    "totalTriangles": 33484,
    "perMesh": [
      { "name": "Face (merged)", "vertices": 33640, "triangles": 7308 },
      { "name": "Body (merged)", "vertices": 57128, "triangles": 11548 },
      { "name": "Hair001 (merged)", "vertices": 12721, "triangles": 14628 }
    ]
  },
  "textures": { "imageCount": 26, "totalImageBytes": 8033934, "maxDimension": 2048 },
  "materials": { "materialCount": 17 }
}

(Output truncated for readability; the tool returns the full bone and image lists.)

vrma_inspect

config.json

{
  "file": { "path": "...\\motion-walk-forward.vrma", "bytes": 3268, "container": "glb" },
  "vrma": { "specVersion": "1.0" },
  "humanoid": { "mappedBoneCount": 16, "bones": ["hips", "spine", "chest", "head", "..."] },
  "animation": {
    "animationCount": 1,
    "channelCount": 2,
    "channelsByPath": { "translation": 1, "rotation": 1, "scale": 0, "weights": 0 },
    "totalKeyframes": 62,
    "durationSec": 1.25,
    "fpsEstimate": 24,
    "frameCountEstimate": 31,
    "humanoidBoneTracks": [
      { "bone": "hips", "paths": ["translation"] },
      { "bone": "chest", "paths": ["rotation"] }
    ]
  }
}

vrm_validate

A finding list with stable codes and severities:

config.json

{
  "ok": false,
  "errorCount": 1,
  "warningCount": 1,
  "findings": [
    { "severity": "error", "code": "HUMANOID_REQUIRED_BONE_MISSING",
      "message": "required humanoid bone is not mapped: leftHand (vrm1 required set)" },
    { "severity": "warning", "code": "META_LICENSE_OTHER_URL_MISSING",
      "message": "licenseName is Other but otherLicenseUrl is empty" }
  ]
}

vrm_snapshot / vrma_preview

config.json

{
  "output_path": "...\\v1-three-quarter-snapshot.png",
  "format": "png", "bytes": 194005, "width": 768, "height": 1024,
  "view": "three_quarter", "pose": "rest", "humanoid_bone_count": 54
}

config.json

{
  "output_path": "...\\v1-walk-preview.webm",
  "format": "webm", "bytes": 313597, "width": 768, "height": 768,
  "clip_duration_sec": 1.25, "recorded_duration_sec": 3, "fps": 30
}

Error codes / エラーコード

Privacy / プライバシー

Development / 開発

Terminal

npm test   # build + 25 self-verification tests (structural, boundary, headless rendering)

Rendering tests skip with a notice when no local Chrome/Edge is found.

License / ライセンス

MIT (see LICENSE). / MITライセンス(LICENSE参照)。

Read the full README →View source on GitHub →

Related MCP Servers

View all in Developer Tools View all alternatives

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

npm downloads

236

Package downloads in the last 30 days.

Last commit

1mo ago

Most recent push to the default branch.

Tools exposed

Callable tools this server registers over MCP.

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about Vrm Toolkit MCP

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "vrm-toolkit-mcp": { "command": "npx", "args": ["-y","vrm-toolkit-mcp"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

53Quality signal: Good · 53/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20

Documentation & tools25/30

Adoption & activity5/15

Community engagement0/10

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

Critical 0High 0Medium 0Low 0

Scanned 2d ago via OSV.dev · vrm-toolkit-mcp (npm)

★ Featured

Moxie Docs MCP

MCP & Agent Skills for Automated Documentation, and codebase conventions + context

Explore Server →

Own this project?

Free dofollow backlink: add your website and place the AllMCPs badge on it — no claim needed. We detect it automatically and keep it verified as long as the badge stays live.

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More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Vrm Toolkit MCP →Install in Claude Desktop Install in Cursor Install in VS Code