MCP-Google-Sheets

A TypeScript Model Context Protocol (MCP) server that lets AI agents securely interact with Google Sheets via well-typed “tools.” Built on Bun and the @modelcontextprotocol/sdk, it supports both OAuth2 and Service-Account flows.

🚀 Features

• Authentication
  • Service-Account via base64-encoded CREDENTIALS_CONFIG
  • OAuth2 using credentials.json + token.json for user-scoped access
• Tools
  • create
    Creates a new spreadsheet (and moves it into your Drive folder if configured).
  • listSheets
    Lists all sheet tabs in a given spreadsheet.
  • renameSheet
    Renames an existing sheet tab.
  • createSheet
    Adds a new sheet tab to a spreadsheet.
  • spreadsheetInfo
    Fetches metadata (title, sheet IDs, grid properties) for a spreadsheet.
  • listSpreadsheets
    Lists all spreadsheets in your configured Drive folder (or My Drive).
  • shareSpreadsheet
    Shares a spreadsheet with users (reader/commenter/writer) and sends notifications.
  • sheetData
    Reads cell values from a sheet and range (or whole sheet).
  • updateCells
    Writes a 2D array of values into an A1-style range.
  • batchUpdate
    Applies multiple range updates in a single request.
  • addRows / addColumns
    Inserts rows or columns at a specified index.
  • copySheet
    Copies a sheet tab between spreadsheets (optionally renaming it).

📋 Prerequisites

• Bun (v1.0+) installed and on your PATH
• A Google Cloud project with:
  • Sheets API & Drive API enabled
  • An OAuth2 Client ID (download credentials.json) or a Service Account key (download service_account.json)
• (Optional) A Drive folder ID if you want new sheets moved out of My Drive

⚙️ Setup

1. Clone the repo

   git clone https://github.com/yourusername/mcp-google-sheets.git
   cd mcp-google-sheets
   

2. Install dependencies

bun install

1. Configure environment

Create a .env (or export) with:

# Base64-encoded service-account key JSON (optional)
CREDENTIALS_CONFIG=BASE-64 ENCODED SERVICE_ACCOUNT.JSON


# Or put your OAuth2 JSON files next to index.ts:
#   credentials.json  (OAuth client secret)
#   token.json        (generated after first OAuth run)

# The google email address that you'll use to access the spreadsheet
EMAIL_ID="Enter the email address you’ll use to access the spreadsheet"
# (Optional) ID of the Drive folder to store new sheets
DRIVE_FOLDER_ID=1a2B3c4D5e6F...

Tip: On Linux/macOS you can do

export CREDENTIALS_CONFIG=$(base64 service_account.json | tr -d '\n')

▶️ Running the Server

bun index.ts

On first OAuth2 run (if using credentials.json), you’ll see a URL. Visit it, grant access, then paste the code back into your terminal. A token.json will be generated automatically.

🔧 How It Works

Initialization

• initContext() picks your auth method (Service-Account → OAuth2 → error).

• Builds google.sheets & google.drive clients and stores them in a shared context.

MCP Tool Registration

• Each “tool” (e.g. create, listSheets, sheetData) is registered via server.tool(...).

Transport

• Uses StdioServerTransport so Claude can invoke tools over stdin/stdout.

Invocation

The agent sends a JSON request:

{ "tool": "create", "args": { "title": "Budget Q2" } }

The server runs your handler, calls Google APIs, and returns JSON-wrapped results.

🛠️ Try It Out

Clone & configure as above.

Start the server:

bun index.ts
Invoke a tool via Claude

Demo

❤️ Contributing

Feel free to open issues or PRs for new tools, bug fixes, and enhancements.