Google Apps Script MCP Server

Author: mohalmah
License: MIT License
Repository: google-apps-script-mcp-server

Welcome to the Google Apps Script MCP (Model Context Protocol) Server! 🚀

This MCP server provides comprehensive integration with the Google Apps Script API, allowing you to manage script projects, deployments, versions, and executions through any MCP-compatible client like Claude Desktop, VS Code with Cline, or Postman.

📋 Table of Contents

• Overview
• Features
• Prerequisites
• Quick Start Guide
• Detailed Setup Instructions
• Available Tools
• Script Authorization
• MCP Client Configuration
• Troubleshooting
• Advanced Usage

🌟 Overview

This MCP server enables seamless interaction with Google Apps Script through:

• ✅ OAuth 2.0 Authentication - Secure token management with automatic refresh
• ✅ 16 Comprehensive Tools - Complete Google Apps Script API coverage
• ✅ MCP Protocol Compliance - Works with Claude Desktop, VS Code, and other MCP clients
• ✅ Secure Token Storage - OS-specific secure storage for refresh tokens
• ✅ Auto Token Refresh - Handles token expiration automatically
• ✅ Detailed Logging - Comprehensive error handling and debugging

🎥 Demo Video

Watch the Google Apps Script MCP Server in action - creating projects, managing deployments, and executing scripts through VS Code AI Agent.

🚀 Features

Core Capabilities

• Project Management: Create, retrieve, and update Google Apps Script projects
• Deployment Management: Create, list, update, and delete script deployments
• Version Control: Create and manage script versions
• Content Management: Get and update script content and files
• Process Monitoring: List and monitor script execution processes
• Metrics Access: Retrieve script execution metrics and analytics
• Script Execution: Run Google Apps Script functions remotely

Security Features

• OAuth 2.0 Flow: Full Google OAuth implementation
• Secure Token Storage: Refresh tokens stored in OS keychain/credential manager
• Automatic Token Refresh: No manual token management required
• Environment Variable Support: Secure credential configuration

⚙️ Prerequisites

Before starting, ensure you have:

• Node.js (v18+ required, v20+ recommended) - Download here
• npm (included with Node.js)
• Google Account with access to Google Cloud Console
• Git (for cloning the repository)

🚀 Quick Start Guide

1. Clone the Repository

git clone https://github.com/mohalmah/google-apps-script-mcp-server.git
cd google-apps-script-mcp-server

2. Install Dependencies

npm install

3. Set Up Google Cloud OAuth

Follow the detailed OAuth setup guide below.

4. Run OAuth Setup

npm run setup-oauth

5. Test the Server

npm start

1.1 MCP config for Node.js

Edit your claude_desktop_config.json file:

• Windows: %APPDATA%\Claude\claude_desktop_config.json
• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "google-apps-script": {
      "command": "node",
      "args": ["/path/to/google-appscript-mcp-server/mcpServer.js"],
      "env": {
        "GOOGLE_APP_SCRIPT_API_CLIENT_ID": "your_client_id",
        "GOOGLE_APP_SCRIPT_API_CLIENT_SECRET": "your_client_secret"
      }
    }
  }
}

1.2 MCP config for Docker

Build the Docker image:

docker build -t google-appscript-mcp:latest .

Edit your claude_desktop_config.json file:

{
  "mcpServers": {
    "google-apps-script": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "-e", "GOOGLE_APP_SCRIPT_API_CLIENT_ID=your_client_id",
        "-e", "GOOGLE_APP_SCRIPT_API_CLIENT_SECRET=your_client_secret",
        "-v", "google-appscript-tokens:/home/app/.config/google-apps-script-mcp",
        "google-appscript-mcp:latest"
      ]
    }
  }
}

📖 Detailed Setup Instructions

If you haven't cloned the repository and installed dependencies yet, follow the Quick Start Guide first.

Step 1: Google Cloud Console Setup

1.1 Create or Select a Google Cloud Project

1. Go to Google Cloud Console
2. Click the project dropdown at the top
3. Click "New Project" or select an existing project
4. If creating new:
   • Enter a project name (e.g., "Google Apps Script MCP")
   • Note your Project ID (you'll need this)
   • Click "Create"

1.2 Enable Required APIs

1. In the Google Cloud Console, navigate to APIs & Services → Library
2. Search for and enable the following APIs:
   • Google Apps Script API (required)
   • Google Drive API (recommended for file access)
   • Google Cloud Resource Manager API (for project operations)

For Google Apps Script API:

1. Search "Google Apps Script API"
2. Click on the result
3. Click "Enable"
4. Wait for the API to be enabled (may take a few minutes)

1.3 Configure OAuth Consent Screen

1. Go to APIs & Services → OAuth consent screen
2. Choose External (unless you're in a Google Workspace organization)
3. Fill in the required information:
   • App name: "Google Apps Script MCP Server"
   • User support email: Your email address
   • App logo: (optional)
   • App domain: Leave blank for development
   • Developer contact information: Your email address
4. Click "Save and Continue"

Configure Scopes (Optional but Recommended):

1. Click "Add or Remove Scopes"
2. Add these scopes:
   • https://www.googleapis.com/auth/script.projects
   • https://www.googleapis.com/auth/script.projects.readonly
   • https://www.googleapis.com/auth/script.deployments
   • https://www.googleapis.com/auth/script.deployments.readonly
   • https://www.googleapis.com/auth/script.metrics
   • https://www.googleapis.com/auth/script.processes
3. Click "Update"

Add Test Users (for External apps):

1. Click "Add Users"
2. Add your Gmail address as a test user
3. Click "Save and Continue"

1.4 Create OAuth 2.0 Credentials

1. Go to APIs & Services → Credentials
2. Click "+ CREATE CREDENTIALS" → "OAuth 2.0 Client IDs"
3. For Application Type, select "Web application"
4. Configure the client:
   • Name: "Google Apps Script MCP Client"
   • Authorized JavaScript origins: (leave empty for now)
   • Authorized redirect URIs: Add exactly this URL:

     http://localhost:3001/oauth/callback
     

5. Click "Create"
6. IMPORTANT: Copy your Client ID and Client Secret immediately
   • Client ID looks like: 1234567890-abcdefghijklmnop.apps.googleusercontent.com
   • Client Secret looks like: GOCSPX-abcdefghijklmnopqrstuvwxyz

Step 2: Configure Environment Variables

2.1 Create .env File

Create a .env file in your project root:

# On Windows
type nul > .env

# On macOS/Linux
touch .env

2.2 Add OAuth Credentials

Edit the .env file and add your credentials:

# Google Apps Script API OAuth Configuration
GOOGLE_APP_SCRIPT_API_CLIENT_ID=your_client_id_here
GOOGLE_APP_SCRIPT_API_CLIENT_SECRET=your_client_secret_here

# Optional: Logging level
LOG_LEVEL=info

Replace the placeholders with your actual values:

• Replace your_client_id_here with your Client ID
• Replace your_client_secret_here with your Client Secret

Step 3: OAuth Authentication Setup

3.1 Run OAuth Setup

Execute the OAuth setup script:

npm run setup-oauth

What this does:

1. Starts a temporary local server on http://localhost:3001
2. Opens your default browser to Google's authorization page
3. Asks you to grant permissions to the application
4. Captures the authorization code via the callback URL
5. Exchanges the code for access and refresh tokens
6. Stores the refresh token securely in your OS credential store
7. Tests the token by making a test API call

3.2 Grant Permissions

When your browser opens:

1. Select your Google account (must be the test user you added)
2. Review the permissions being requested:
   • See and manage your Google Apps Script projects
   • See your script executions and metrics
   • Access your script deployments
3. Click "Continue" or "Allow"
4. You should see: "OAuth setup completed successfully!"

3.3 Verify Token Storage

The setup process stores tokens securely:

• Windows: Windows Credential Manager
• macOS: Keychain Access
• Linux: Secret Service API (GNOME Keyring/KDE Wallet)

Step 4: Test Your Setup

4.1 Test the MCP Server

npm start

You should see output like:

Google Apps Script MCP Server running on stdio
OAuth tokens loaded successfully
Server ready to handle MCP requests

4.2 Test with Available Commands

# List all available tools
npm run list-tools

# Test OAuth connection
npm run test-oauth

# Enable debug logging
npm run debug

🛠️ Available Tools

This MCP server provides 16 comprehensive tools for Google Apps Script management:

Project Management Tools

1. script-projects-create

Purpose: Create a new Google Apps Script project Parameters:

• title (required): The title of the new script project
• parentId (optional): The ID of the parent project

Example Usage: Create a new script for automation tasks

// Creates: "My Automation Script" project
{
  "title": "My Automation Script",
  "parentId": "1234567890"
}

2. script-projects-get

Purpose: Get metadata of a Google Apps Script project Parameters:

• scriptId (required): The ID of the script project to retrieve
• fields (optional): Specific fields to include in response
• alt (optional): Data format for response (default: 'json')

Example Usage: Retrieve project information

// Gets project details for script ID
{
  "scriptId": "1ABC123def456GHI789jkl"
}

3. script-projects-get-content

Purpose: Get the content of a Google Apps Script project Parameters:

• scriptId (required): The ID of the script project
• versionNumber (optional): Specific version number to retrieve

What it returns: Complete source code and files in the project Example Usage: Download script source code for backup or analysis

4. script-projects-update-content

Purpose: Update the content of a Google Apps Script project Parameters:

• scriptId (required): The ID of the script project to update
• files (required): Array of file objects with name, type, and source

Example Usage: Deploy code changes to your script project

Version Management Tools

5. script-projects-versions-create

Purpose: Create a new version of a Google Apps Script project Parameters:

• scriptId (required): The ID of the script project
• description (required): Description for the new version

Example Usage: Create versioned snapshots for deployment

{
  "scriptId": "1ABC123def456GHI789jkl",
  "description": "Added email notification feature"
}

6. script-projects-versions-get

Purpose: Get details of a specific script version Parameters:

• scriptId (required): The ID of the script project
• versionNumber (required): The version number to retrieve

7. script-projects-versions-list

Purpose: List all versions of a script project Parameters:

• scriptId (required): The ID of the script project
• pageSize (optional): Number of versions per page
• pageToken (optional): Token for pagination

Deployment Management Tools

8. script-projects-deployments-create

Purpose: Create a deployment of a Google Apps Script project Parameters:

• scriptId (required): The ID of the script to deploy
• versionNumber (required): Version number to deploy
• manifestFileName (required): Name of the manifest file
• description (required): Description for the deployment

Example Usage: Deploy your script as a web app or API executable

{
  "scriptId": "1ABC123def456GHI789jkl",
  "versionNumber": 3,
  "manifestFileName": "appsscript.json",
  "description": "Production deployment v1.2"
}

Note: If your deployment uses Google services like DriveApp or SpreadsheetApp, you must manually authorize the script in the Apps Script editor before the web app will respond. See Script Authorization.

9. script-projects-deployments-get

Purpose: Get details of a specific deployment Parameters:

• scriptId (required): The ID of the script project
• deploymentId (required): The ID of the deployment

10. script-projects-deployments-list

Purpose: List all deployments of a script project Parameters:

• scriptId (required): The ID of the script project
• pageSize (optional): Number of deployments per page

11. script-projects-deployments-update

Purpose: Update an existing deployment Parameters:

• scriptId (required): The ID of the script project
• deploymentId (required): The ID of the deployment to update
• deploymentConfig (required): New deployment configuration

12. script-projects-deployments-delete

Purpose: Delete a deployment Parameters:

• scriptId (required): The ID of the script project
• deploymentId (required): The ID of the deployment to delete

Execution and Monitoring Tools

13. script-scripts-run

Purpose: Execute a Google Apps Script function Parameters:

• scriptId (required): The ID of the script to run
• Additional parameters specific to the function being executed

Example Usage: Trigger script execution remotely Note: The script must be deployed and you must have execution permissions

14. script-processes-list

Purpose: List execution processes for a script project Parameters:

• scriptId (required): The ID of the script project
• pageSize (optional): Number of processes per page
• pageToken (optional): Token for pagination
• statuses (optional): Filter by process statuses
• types (optional): Filter by process types
• functionName (optional): Filter by function name
• startTime (optional): Filter by start time
• endTime (optional): Filter by end time

What it shows: Running, completed, and failed script executions

15. script-processes-list-script-processes

Purpose: Alternative method to list script processes with additional filtering Parameters: Similar to script-processes-list with enhanced filtering options

16. script-projects-get-metrics

Purpose: Get execution metrics and analytics for a script project Parameters:

• scriptId (required): The ID of the script project
• deploymentId (required): The ID of the deployment
• metricsGranularity (required): Granularity of metrics data
• fields (required): Specific metric fields to retrieve

What it provides:

• Execution counts
• Error rates
• Performance metrics
• Usage analytics

Tool Categories Summary

Category	Tools	Purpose
Project Management	create, get, get-content, update-content	Manage script projects and source code
Version Control	versions-create, versions-get, versions-list	Handle script versioning
Deployment	deployments-create, deployments-get, deployments-list, deployments-update, deployments-delete	Manage script deployments
Execution	scripts-run	Execute script functions
Monitoring	processes-list, get-metrics	Monitor execution and performance

Common Use Cases

Development Workflow:

1. Use script-projects-create to create new projects
2. Use script-projects-update-content to upload code
3. Use script-projects-versions-create to create stable versions
4. Use script-projects-deployments-create to deploy for production

Monitoring and Debugging:

1. Use script-processes-list to see execution history
2. Use script-projects-get-metrics to analyze performance
3. Use script-projects-get-content to backup source code

Production Management:

1. Use script-projects-deployments-list to see all deployments
2. Use script-projects-deployments-update to update production configs
3. Use script-scripts-run to trigger automated workflows

⚠️ Script Authorization

When a script uses Google services such as DriveApp, SpreadsheetApp, GmailApp, or CalendarApp, it must be manually authorized before the deployed web app will respond correctly. The MCP server's API deployment does not trigger Google's OAuth consent flow.

If your deployed web app returns "Access Denied" or "You need access", complete these steps once after deployment:

1. Open the script in the Apps Script editor:

   https://script.google.com/d/{SCRIPT_ID}/edit
   

   (Replace {SCRIPT_ID} with the ID returned by script-projects-create or script-projects-get.)

2. Click Run on any function that calls a Google service (e.g., doGet).

3. When prompted, click Review Permissions.

4. Complete the Google OAuth consent flow:

   • Select your Google account
   • Click Advanced → Go to {project name} (unsafe)
   • Click Allow

5. Your deployed web app will now work correctly.

Note: This is a Google Apps Script platform requirement and cannot be bypassed via the API.

🌐 Test the MCP Server with Postman

The MCP Server (mcpServer.js) exposes your automated API tools to MCP-compatible clients, such as Claude Desktop or the Postman Desktop Application. We recommend that you test the server with Postman first and then move on to using it with an LLM.

Step 1: Download the latest Postman Desktop Application from https://www.postman.com/downloads/.

Step 2: Read the documentation article here and see how to create an MCP request inside the Postman app.

Step 3: Set the type of the MCP request to STDIO and set the command to node <absolute/path/to/mcpServer.js>.

For Windows users, you can get the full path to node by running:

Get-Command node | Select-Object -ExpandProperty Source

For macOS/Linux users, you can get the full path to node by running:

which node

To check the node version on any platform, run:

node --version

For Windows users, to get the absolute path to mcpServer.js, run:

Get-Location | Select-Object -ExpandProperty Path

Then append \mcpServer.js to the path.

For macOS/Linux users, to get the absolute path to mcpServer.js, run:

realpath mcpServer.js

Use the node command followed by the full path to mcpServer.js as the command for your new Postman MCP Request. Then click the Connect button. You should see a list of tools that you selected before generating the server. You can test that each tool works here before connecting the MCP server to an LLM.

🔗 MCP Client Configuration

You can connect your MCP server to various MCP clients. Below are detailed instructions for both Claude Desktop and VS Code.

📋 Getting Required Paths

Before configuring any MCP client, you'll need the absolute paths to Node.js and your mcpServer.js file.

🪟 Windows Users

Get Node.js path:

Get-Command node | Select-Object -ExpandProperty Source

Example output: C:\nvm4w\nodejs\node.exe

Alternative method if first doesn't work:

where.exe node

Get current directory path:

Get-Location | Select-Object -ExpandProperty Path

Example output: C:\Users\mohal\Downloads\google-appscriot-mcp-server

Complete mcpServer.js path:

Join-Path (Get-Location) "mcpServer.js"

Example output: C:\Users\mohal\Downloads\google-appscriot-mcp-server\mcpServer.js

Quick copy-paste command to get both paths:

Write-Host "Node.js path: $((Get-Command node).Source)"
Write-Host "mcpServer.js path: $(Join-Path (Get-Location) 'mcpServer.js')"

🍎 macOS Users

Get Node.js path:

which node

Example output: /usr/local/bin/node or /opt/homebrew/bin/node

Get mcpServer.js path:

realpath mcpServer.js

Example output: /Users/username/google-apps-script-mcp-server/mcpServer.js

Alternative method:

echo "$(pwd)/mcpServer.js"

Quick copy-paste command to get both paths:

echo "Node.js path: $(which node)"
echo "mcpServer.js path: $(realpath mcpServer.js)"

🐧 Linux Users

Get Node.js path:

which node

Example output: /usr/bin/node or /usr/local/bin/node

Get mcpServer.js path:

realpath mcpServer.js

Example output: /home/username/google-apps-script-mcp-server/mcpServer.js

Quick copy-paste command to get both paths:

echo "Node.js path: $(which node)"
echo "mcpServer.js path: $(realpath mcpServer.js)"

✅ Verify Node.js Version

On any platform, verify your Node.js version:

node --version

Ensure it shows v18.0.0 or higher.

🤖 Claude Desktop Setup

Step 1: Note the full paths from the previous section.

Step 2: Open Claude Desktop and navigate to:

• Settings → Developers → Edit Config

Step 3: Add your MCP server configuration:

Configuration Template

{
  "mcpServers": {
    "google-apps-script": {
      "command": "<absolute_path_to_node_executable>",
      "args": ["<absolute_path_to_mcpServer.js>"],
      "env": {
        "GOOGLE_APP_SCRIPT_API_CLIENT_ID": "your_client_id_here",
        "GOOGLE_APP_SCRIPT_API_CLIENT_SECRET": "your_client_secret_here"
      }
    }
  }
}

Windows Example

{
  "mcpServers": {
    "google-apps-script": {
      "command": "C:\\nvm4w\\nodejs\\node.exe",
      "args": ["C:\\Users\\mohal\\Downloads\\google-appscriot-mcp-server\\mcpServer.js"],
      "env": {
        "GOOGLE_APP_SCRIPT_API_CLIENT_ID": "1234567890-abcdefghijk.apps.googleusercontent.com",
        "GOOGLE_APP_SCRIPT_API_CLIENT_SECRET": "GOCSPX-abcdefghijklmnopqrstuvwxyz"
      }
    }
  }
}

macOS/Linux Example

{
  "mcpServers": {
    "google-apps-script": {
      "command": "/usr/local/bin/node",
      "args": ["/Users/username/google-apps-script-mcp-server/mcpServer.js"],
      "env": {
        "GOOGLE_APP_SCRIPT_API_CLIENT_ID": "1234567890-abcdefghijk.apps.googleusercontent.com",
        "GOOGLE_APP_SCRIPT_API_CLIENT_SECRET": "GOCSPX-abcdefghijklmnopqrstuvwxyz"
      }
    }
  }
}

Step 4: Replace the OAuth credentials with your actual values from the .env file.

Step 5: Save the configuration and restart Claude Desktop.

Step 6: Verify the connection by checking that the MCP server shows a green circle indicator next to it in Claude Desktop.

📝 VS Code Setup (Cline/MCP Extensions)

VS Code can use MCP servers through extensions like Cline or other MCP-compatible extensions.

Using with Cline Extension

Step 1: Install the Cline extension from the VS Code marketplace.

Step 2: Open VS Code settings (Ctrl+, on Windows/Linux, Cmd+, on macOS).

Step 3: Search for "Cline" or "MCP" in the settings.

Step 4: Add your MCP server configuration:

Method 1: VS Code Settings.json

Add to your VS Code settings.json (accessible via Ctrl+Shift+P → "Preferences: Open Settings (JSON)"):

{
  "cline.mcpServers": {
    "google-apps-script": {
      "command": "C:\\nvm4w\\nodejs\\node.exe",
      "args": ["C:\\Users\\mohal\\Downloads\\google-appscriot-mcp-server\\mcpServer.js"],
      "env": {
        "GOOGLE_APP_SCRIPT_API_CLIENT_ID": "your_client_id_here",
        "GOOGLE_APP_SCRIPT_API_CLIENT_SECRET": "your_client_secret_here"
      }
    }
  }
}

Method 2: Workspace Configuration

Create a .vscode/settings.json file in your project root:

{
  "cline.mcpServers": {
    "google-apps-script": {
      "command": "node",
      "args": ["./mcpServer.js"],
      "env": {
        "GOOGLE_APP_SCRIPT_API_CLIENT_ID": "your_client_id_here",
        "GOOGLE_APP_SCRIPT_API_CLIENT_SECRET": "your_client_secret_here"
      }
    }
  }
}

🔧 Configuration File Locations

Claude Desktop Config Location:

• Windows: %APPDATA%\Claude\claude_desktop_config.json
• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Linux: ~/.config/claude-desktop/claude_desktop_config.json

VS Code Settings Location:

• Windows: %APPDATA%\Code\User\settings.json
• macOS: ~/Library/Application Support/Code/User/settings.json
• Linux: ~/.config/Code/User/settings.json

🔑 Remember to:

1. Replace your_actual_client_id and your_actual_client_secret with your OAuth credentials
2. Update the paths based on your actual system output from the commands above
3. Use your actual username instead of username in the paths
4. Ensure you've run npm run setup-oauth before configuring MCP clients

🔍 Troubleshooting

Common Issues and Solutions

1. "Command not found" or "Node not found" errors

Problem: MCP client can't find Node.js executable Solutions:

• Ensure Node.js is properly installed and in your PATH
• Use absolute paths to the Node.js executable (recommended)
• Verify Node.js version is 18+ using node --version
• On Windows, check if multiple Node.js versions are installed

2. "fetch is not defined" errors

Problem: Your Node.js version is below 18 Solutions:

• Recommended: Upgrade to Node.js 18+
• Alternative: Install node-fetch as a dependency:

  npm install node-fetch
  

  Then modify each tool file to import fetch:

  import fetch from 'node-fetch';
  

3. OAuth authentication errors

Problem: Authentication failures or token issues Solutions:

• Verify your OAuth credentials are correct in the .env file
• Ensure environment variables are properly set in the MCP configuration
• Re-run the OAuth setup: npm run setup-oauth
• Check that you've followed all steps in the Google Cloud Console setup
• Verify the callback URL is exactly: http://localhost:3001/oauth/callback
• Make sure your Google account is added as a test user

4. "Authorization Error: Access blocked"

Problem: Google OAuth consent screen configuration issues Solutions:

• Ensure your app is configured for "External" users
• Add your Gmail address as a test user in OAuth consent screen
• Verify all required scopes are added
• Make sure the OAuth consent screen is properly published

5. MCP server not appearing in Claude Desktop

Problem: Configuration file syntax or path issues Solutions:

• Check the configuration file syntax (valid JSON)
• Ensure file paths use proper escaping (double backslashes on Windows)
• Restart Claude Desktop after configuration changes
• Check Claude Desktop logs for error messages
• Verify the config file is in the correct location

6. VS Code/Cline connection issues

Problem: Extension not recognizing MCP server Solutions:

• Verify the extension is properly installed and enabled
• Check that the MCP configuration is in the correct settings location
• Reload the VS Code window after configuration changes
• Use workspace-specific settings if global settings don't work

7. "Permission denied" errors (macOS/Linux)

Problem: File permission issues Solutions:

• Make the mcpServer.js file executable: chmod +x mcpServer.js
• Or use the full node command: node /path/to/mcpServer.js
• Check file ownership and permissions

8. "EADDRINUSE" or port conflicts

Problem: Port 3001 is already in use during OAuth setup Solutions:

• Kill any processes using port 3001:

  # Find process using port 3001
  lsof -i :3001  # macOS/Linux
  netstat -ano | findstr :3001  # Windows
  
  # Kill the process
  kill -9 <PID>  # macOS/Linux
  taskkill /PID <PID> /F  # Windows
  

• Or temporarily change the port in oauth-setup.js

9. "Token expired" or "Invalid credentials" errors

Problem: OAuth tokens have expired or are invalid Solutions:

• Re-run the OAuth setup: npm run setup-oauth
• Clear stored tokens and re-authenticate
• Check that your OAuth app credentials haven't changed
• Verify the OAuth app is still active in Google Cloud Console

10. Script execution permission errors

Problem: Can't execute scripts or access projects Solutions:

• Ensure your Google account has access to the Apps Script projects
• Verify the script is shared with your account
• Check that the required scopes are granted
• For script execution, ensure the script is deployed and executable

11. "Access Denied" or "You need access" on deployed web app

Problem: Scripts using Google services (DriveApp, SpreadsheetApp, etc.) require manual authorization before the deployed URL works. Solution: See the Script Authorization section for step-by-step instructions.

Testing Your Configuration

Test MCP Server Independently

npm start

If it starts without errors, your basic setup is correct.

Test OAuth Authentication

npm run test-oauth

This verifies your OAuth setup is working correctly.

Test with Debug Logging

npm run debug

This provides detailed logging to help identify issues.

Test Individual Tools

npm run list-tools

This lists all available tools and their parameters.

Log Files and Debugging

Enable Debug Logging

Set the LOG_LEVEL environment variable:

# In .env file
LOG_LEVEL=debug

# Or run with debug
npm run debug

Check OAuth Flow

The OAuth setup process provides detailed output. Watch for:

• Browser opening successfully
• Authorization code capture
• Token exchange success
• Test API call success

Common Log Messages

Success Messages:

• OAuth tokens loaded successfully
• Server ready to handle MCP requests
• Tool executed successfully

Warning Messages:

• Token refresh required (normal operation)
• Retrying API call with refreshed token

Error Messages:

• OAuth credentials not found → Check .env file
• Failed to refresh token → Re-run OAuth setup
• API call failed → Check permissions and quotas

Getting Help

Support Resources

1. Google Apps Script API Documentation: https://developers.google.com/apps-script/api
2. MCP Protocol Documentation: https://modelcontextprotocol.io/
3. OAuth 2.0 Guide: https://developers.google.com/identity/protocols/oauth2

Diagnostic Information to Collect

When seeking help, please provide:

• Node.js version (node --version)
• Operating system and version
• Error messages from console/logs
• Steps you followed before the error
• Contents of your .env file (without secrets)
• MCP client configuration (without secrets)

🚀 Advanced Usage

Environment Variables

Core Configuration

# Required OAuth credentials
GOOGLE_APP_SCRIPT_API_CLIENT_ID=your_client_id
GOOGLE_APP_SCRIPT_API_CLIENT_SECRET=your_client_secret

# Optional configuration
LOG_LEVEL=info                    # debug, info, warn, error
NODE_ENV=development              # development, production
PORT=3001                        # OAuth callback port

Logging Levels

• debug: Detailed debugging information
• info: General information messages
• warn: Warning messages
• error: Error messages only

Running in Production

Using PM2 Process Manager

# Install PM2
npm install -g pm2

# Start with PM2
pm2 start mcpServer.js --name "gas-mcp-server"

# Monitor
pm2 status
pm2 logs gas-mcp-server

# Auto-restart on system boot
pm2 startup
pm2 save

Using Docker

Build Docker image:

docker build -t google-apps-script-mcp .

Run with Docker:

docker run -i --rm --env-file=.env google-apps-script-mcp

Docker Compose setup:

version: '3.8'
services:
  gas-mcp:
    build: .
    env_file:
      - .env
    stdin_open: true
    tty: true

Claude Desktop with Docker

{
  "mcpServers": {
    "google-apps-script": {
      "command": "docker",
      "args": ["run", "-i", "--rm", "--env-file=.env", "google-apps-script-mcp"]
    }
  }
}

Custom Tool Development

Adding New Tools

1. Create a new tool file in tools/google-app-script-api/apps-script-api/:

import { getAuthHeaders } from '../../../lib/oauth-helper.js';

const executeFunction = async ({ param1, param2 }) => {
  const baseUrl = 'https://script.googleapis.com';
  
  try {
    const headers = await getAuthHeaders();
    const response = await fetch(`${baseUrl}/v1/your-endpoint`, {
      method: 'POST',
      headers,
      body: JSON.stringify({ param1, param2 })
    });
    
    return await response.json();
  } catch (error) {
    throw new Error(`API call failed: ${error.message}`);
  }
};

export { executeFunction };

2. Add to paths.js:

export const toolPaths = [
  // ...existing paths...
  'google-app-script-api/apps-script-api/your-new-tool.js'
];

3. Update tool descriptions in your MCP server tool definitions.

Tool Template Structure

import { getAuthHeaders } from '../../../lib/oauth-helper.js';

/**
 * Tool description and JSDoc comments
 */
const executeFunction = async (args) => {
  const baseUrl = 'https://script.googleapis.com';
  
  try {
    // 1. Validate parameters
    if (!args.requiredParam) {
      throw new Error('requiredParam is required');
    }
    
    // 2. Get authentication headers
    const headers = await getAuthHeaders();
    
    // 3. Make API call
    const response = await fetch(`${baseUrl}/v1/endpoint`, {
      method: 'GET/POST/PUT/DELETE',
      headers,
      body: JSON.stringify(args) // for POST/PUT
    });
    
    // 4. Handle response
    if (!response.ok) {
      throw new Error(`API error: ${response.status} ${response.statusText}`);
    }
    
    return await response.json();
    
  } catch (error) {
    console.error('Tool execution failed:', error);
    throw error;
  }
};

export { executeFunction };

Server-Sent Events (SSE) Mode

For real-time communication with web interfaces:

npm run start-sse

The server will run on HTTP with SSE support for streaming responses.

Multiple Environment Support

Development Environment

NODE_ENV=development
LOG_LEVEL=debug
GOOGLE_APP_SCRIPT_API_CLIENT_ID=dev_client_id
GOOGLE_APP_SCRIPT_API_CLIENT_SECRET=dev_client_secret

Production Environment

NODE_ENV=production
LOG_LEVEL=info
GOOGLE_APP_SCRIPT_API_CLIENT_ID=prod_client_id
GOOGLE_APP_SCRIPT_API_CLIENT_SECRET=prod_client_secret

Performance Optimization

Token Caching

The OAuth helper automatically caches access tokens in memory and refreshes them as needed.

Request Batching

For multiple operations, consider batching requests where possible:

// Instead of multiple individual calls
const results = await Promise.all([
  tool1(args1),
  tool2(args2),
  tool3(args3)
]);

Rate Limiting

Google Apps Script API has rate limits. The tools include automatic retry logic with exponential backoff.

Security Best Practices

Credential Management

• Never commit .env files to version control
• Use different OAuth apps for development and production
• Regularly rotate OAuth credentials
• Monitor OAuth app usage in Google Cloud Console

Access Control

• Use least-privilege OAuth scopes
• Add only necessary test users to your OAuth app
• Monitor script execution logs for unauthorized access
• Implement logging for all API calls

Network Security

• Run the MCP server in a secure environment
• Use HTTPS for production deployments
• Implement proper firewall rules
• Monitor network traffic for anomalies

🛠️ Additional CLI Commands

Available npm Scripts

# Start the MCP server
npm start

# Start with SSE support
npm run start-sse

# Start with debug logging
npm run debug

# Start SSE with debug logging
npm run debug-sse

# List all available tools and their descriptions
npm run list-tools

# Test OAuth authentication
npm run test-oauth

# Set up or refresh OAuth tokens
npm run setup-oauth

# Test logging functionality
npm run test-logging

Tool Information

List Available Tools

npm run list-tools

Example output:

Available Tools:

Google Apps Script API:
  script-projects-create
    Description: Create a new Google Apps Script project
    Parameters:
      - title (required): The title of the new script project
      - parentId (optional): The ID of the parent project

  script-projects-get
    Description: Get metadata of a Google Apps Script project
    Parameters:
      - scriptId (required): The ID of the script project to retrieve
      - fields (optional): Specific fields to include in response
      [... additional parameters ...]

Adding New Tools from Postman

1. Visit Postman MCP Generator
2. Select new API requests for Google Apps Script or other APIs
3. Generate a new MCP server
4. Copy new tool files into your existing tools/ folder
5. Update tools/paths.js to include new tool references
6. Restart your MCP server

💬 Support and Community

Getting Help

• GitHub Issues: Report bugs and request features
• Postman Discord: Join the #mcp-lab channel in Postman Discord
• Documentation: Visit Postman MCP Generator for updates

Contributing

Contributions are welcome! Please:

1. Fork the repository
2. Create a feature branch
3. Add tests for new functionality
4. Submit a pull request

License

This project is licensed under the MIT License. See the LICENSE file for details.