Google Tag Manager MCP Server

MCP server for Google Tag Manager API v2. Provides programmatic access to GTM accounts, containers, workspaces, tags, triggers, variables, and version management.

Requirements

• Node.js 18.0.0+

• Google Cloud Project with Tag Manager API enabled

• OAuth 2.0 credentials (Desktop application type)

Related MCP server: unboundai-gtm-mcp-server

Installation

Install from npm (Recommended)

npm install -g gtm-mcp

Or install locally:

npm install gtm-mcp

Install from source

git clone https://github.com/pouyanafisi/gtm-mcp.git
cd gtm-mcp
npm install
npm run build

Google Cloud Setup

1. Enable Tag Manager API in Google Cloud Console

2. Create OAuth 2.0 credentials (Desktop application)

3. Download credentials JSON

4. Save as credentials.json in gtm-mcp directory

Configuration

Using npm package

If installed globally, use the binary directly:

{
  "mcpServers": {
    "gtm": {
      "command": "gtm-mcp",
      "env": {
        "GTM_CREDENTIALS_FILE": "/absolute/path/to/credentials.json",
        "GTM_TOKEN_FILE": "/absolute/path/to/token.json"
      }
    }
  }
}

If installed locally, use npx:

{
  "mcpServers": {
    "gtm": {
      "command": "npx",
      "args": ["gtm-mcp"],
      "env": {
        "GTM_CREDENTIALS_FILE": "/absolute/path/to/credentials.json",
        "GTM_TOKEN_FILE": "/absolute/path/to/token.json"
      }
    }
  }
}

Using source installation

{
  "mcpServers": {
    "gtm": {
      "command": "node",
      "args": ["/absolute/path/to/gtm-mcp/dist/index.js"],
      "env": {
        "GTM_CREDENTIALS_FILE": "/absolute/path/to/gtm-mcp/credentials.json",
        "GTM_TOKEN_FILE": "/absolute/path/to/gtm-mcp/token.json"
      }
    }
  }
}

See MCP_SETUP.md for platform-specific instructions.

Authentication

Using npm package

If installed globally:

gtm-mcp-auth

Or with npx:

npx gtm-mcp-auth

Using source installation

npm run auth

Token saved to token.json and auto-refreshed.

Operations

99 operations available (95 API operations + 4 workflow helpers). See OPERATIONS.md for complete reference.

Categories

• Accounts: List, get, update accounts

• Containers: List, get, create, update, delete, snippet, lookup, combine, move tag ID

• Workspaces: List, get, create, update, delete, status, sync, resolve conflicts, bulk update, quick preview

• Tags: List, get, create, update, delete, revert

• Triggers: List, get, create, update, delete, revert

• Variables: List, get, create, update, delete, revert

• Built-in Variables: List, create, delete, revert

• Folders: List, get, create, update, delete, revert, move entities, get entities

• Container Versions: List, get, update, delete, undelete, set latest, get live, publish

• Version Headers: List, get latest

• Environments: List, get, create, update, delete, reauthorize

• User Permissions: List, get, create, update, delete

• Clients (Server-side): List, get, create, update, delete, revert

• Google Tag Config: List, get, create, update, delete, revert

• Templates: List, get, create, update, delete, revert, import from gallery

• Transformations (Server-side): List, get, create, update, delete, revert

• Zones (Server-side): List, get

• Workflows: GA4 setup, Facebook Pixel, form tracking, site-type workflows

Usage

List containers

List all containers for account 123456

Create GA4 setup

Create GA4 setup with measurement ID G-XXXXXXXXXX for account 123456, container 7890123

Update tag

Update tag 1 in account 123456, container 7890123 with new parameters

Publish changes

Publish version for account 123456, container 7890123 with name "Version 1.0"

GTM IDs

• Account ID: Numeric string (e.g., 123456)

• Container ID: Numeric string (e.g., 7890123)

• Workspace ID: Numeric string (e.g., 1 for default)

• Public Container ID: GTM-XXXXXXX format (not used by API)

Find IDs in GTM UI URL or container settings.

Project Structure

gtm-mcp/
├── src/
│   ├── index.ts              # MCP server
│   ├── gtm-client.ts         # GTM API client
│   ├── gtm-components.ts     # Workflow templates
│   ├── auth-helper.ts        # OAuth2 helper
│   └── auth.ts               # Auth script
├── docs/                      # API documentation
├── dist/                      # Compiled output
└── package.json

Development

npm run dev          # Watch mode
npm run type-check   # Type checking
npm run build        # Build
npm run auth         # Authenticate
npm test             # Run tests
npm run test:run     # Run tests once
npm run test:ui      # Test UI
npm run test:coverage # Coverage report

Documentation

• OPERATIONS.md - All 99 operations reference

• docs/ - GTM API v2 documentation

• API_COVERAGE.md - Implementation coverage

• MCP_SETUP.md - Setup instructions

• CONTRIBUTING.md - Contribution guidelines

Troubleshooting

Authentication fails: Run npm run auth separately. Verify credentials.json exists.

Permission errors: Verify account has edit access to container. Use numeric IDs, not GTM-XXX.

API errors: Check account/container IDs. Verify workspace exists. Check rate limits.

Build errors: Node.js 18+, run npm install, verify TypeScript config.

License

MIT