google-sheets-mcp

MCP server for Google Sheets - read, write, and query spreadsheet data.

Use Cases

Data questions: "How many open deals are in the pipeline?" or "What's our total Q3 revenue?" → reads the spreadsheet and answers directly.

Quick expense entry: Snap a photo of a receipt → extracts the details and appends a row to your expense tracker.

Cross-tool status sync: "Check all our vendor Slack channels and update the tracking spreadsheet with their latest updates" → reads Slack, updates the sheet.

Data analysis: "Break down the Salesforce figures by region and compare against our events calendar" → pulls data from multiple sources into a spreadsheet for analysis.

(These are just examples - any workflow that needs spreadsheet data can use this. Use in combination with google-drive-mcp for finding files, deleting, comments, and sharing permissions.)

Setup

1. Create Google OAuth credentials

1. Go to Google Cloud Console
2. Create a new project (or use existing)
3. Enable the Google Sheets API
4. Go to APIs & Services → OAuth consent screen, set up consent screen
5. Go to APIs & Services → Credentials → Create Credentials → OAuth client ID
6. Choose Web application
7. Add http://localhost:3000/callback to Authorized redirect URIs
8. Note your Client ID and Client Secret

2. Run the server

GOOGLE_CLIENT_ID='your-client-id' \
GOOGLE_CLIENT_SECRET='your-client-secret' \
MCP_TRANSPORT=http \
npm start

The server runs on http://localhost:3000 by default. Change with PORT=3001.

3. Add to your MCP client

claude mcp add --transport http google-sheets-mcp http://localhost:3000/mcp

Architecture

This server acts as an OAuth proxy to Google:

graph LR
    A[MCP client] <--> B[google-sheets-mcp] <--> C[Google OAuth/API]

1. Server advertises itself as an OAuth authorization server via /.well-known/oauth-authorization-server
2. /register returns the Google OAuth client credentials
3. /authorize redirects to Google, encoding the client's callback URL in state
4. /callback receives the code from Google and forwards to the client's callback
5. /token proxies token requests to Google, injecting client credentials
6. /mcp handles MCP requests, using the bearer token to call Google Sheets API

The server holds no tokens or state - it just proxies OAuth to Google.

Tools

Google Sheets API Scope

• spreadsheets - Full read/write access to spreadsheets

Contributing

Pull requests are welcomed on GitHub! To get started:

1. Install Git and Node.js
2. Clone the repository
3. Install dependencies with npm install
4. Run npm run test to run tests
5. Build with npm run build

Releases

Versions follow the semantic versioning spec.

To release:

1. Use npm version <major | minor | patch> to bump the version
2. Run git push --follow-tags to push with tags
3. Wait for GitHub Actions to publish to the NPM registry.