Google Docs MCP Proxy

A local stdio MCP server that handles Google OAuth2 locally and proxies authenticated requests to the Google Docs and Google Drive REST APIs.

This solves the problem where Cursor cannot complete OAuth for Google's hosted Workspace MCP servers (Google does not support the cursor:// redirect protocol).

Architecture

Cursor Agent ──stdio JSON-RPC──► Local MCP Server ──Bearer──► docs.googleapis.com
                                        │                  └──► drive.googleapis.com
                                        └──► OAuth2 Token Manager ──► Google OAuth

Prerequisites

1. A Google Cloud project with:

• Google Docs API enabled
• Google Drive API enabled
• OAuth consent screen configured with scopes:
• https://www.googleapis.com/auth/documents
• https://www.googleapis.com/auth/drive
• OAuth 2.0 client of type Desktop app (not Web application)

— Desktop app clients allow http://127.0.0.1 redirects without pre-registration

1. Node.js 18+

Setup

1. Install dependencies

npm install

2. Configure environment

cp .env.example .env

Edit .env and fill in your OAuth client credentials from Google Cloud Console:

GOOGLE_CLIENT_ID=your-client-id.apps.googleusercontent.com
GOOGLE_CLIENT_SECRET=your-client-secret

3. Authorize (one-time)

npm run auth

This opens your browser to Google's consent screen, completes the OAuth2 flow, and saves tokens to token.json (gitignored). You only need to do this once — tokens refresh automatically.

Headless alternative: Set GOOGLE_REFRESH_TOKEN=<your-refresh-token> in .env to skip the interactive flow entirely.

4. Add to Cursor's mcp.json

Add the following entry to ~/.cursor/mcp.json (under mcpServers):

"google-docs": {
  "command": "node",
  "args": [
    "D:\\Documents\\_Projects\\google-docs-mcp\\node_modules\\tsx\\dist\\cli.mjs",
    "D:\\Documents\\_Projects\\google-docs-mcp\\src\\index.ts"
  ]
}

Restart Cursor after saving.

MCP Tools

google_docs_request

Make any request to the Google Docs REST API.

Examples:

Create a document:

{ "path": "documents", "method": "POST", "body": { "title": "My New Doc" } }

Read a document:

{ "path": "documents/DOC_ID", "method": "GET" }

Insert text via batchUpdate:

{
  "path": "documents/DOC_ID:batchUpdate",
  "method": "POST",
  "body": {
    "requests": [
      { "insertText": { "text": "Hello world\n", "location": { "index": 1 } } }
    ]
  }
}

google_drive_request

Make any request to the Google Drive REST API v3.

Same parameters; base URL is https://www.googleapis.com/drive/v3/.

Examples:

List files:

{ "path": "files", "method": "GET", "query": { "pageSize": "10" } }

Search for docs:

{
  "path": "files",
  "method": "GET",
  "query": { "q": "mimeType='application/vnd.google-apps.document'", "pageSize": "5" }
}

Development

npm run dev    # tsx --watch (hot reload)
npm start      # run once
npm run auth   # re-authorize (if tokens are revoked)

Security notes

• .env and token.json are gitignored — never commit them
• OAuth credentials live in the project .env, not in global mcp.json
• Token refresh happens automatically via native fetch; no manual intervention needed after initial auth