Grounders MCP server

Google Multi-Account Connector

A remote MCP server that gives Claude access to several Google accounts at once — Gmail, Calendar, Drive, Contacts and Tasks. Claude's built-in Google connectors each hold exactly one account; connecting a second replaces the first. This holds as many as you link, and every search tool fans out across all of them in a single call.

You run it yourself. It holds your Google tokens in your own database, encrypted, and talks to Google directly — nothing passes through a third party.

Node and Postgres, four tables, and no dependencies beyond Express, pg and jsonwebtoken. Document text extraction — PDF, Word, Excel, PowerPoint, OpenDocument — uses only Node's standard library.

Status: running in production against real mailboxes, with 435 automated checks. Built for one person's needs and published because the one-account limit is not unique to them. Treat it as working software with a small user base, not as a hardened product.

Quick start

git clone https://github.com/ItsBreeze/google-multi-account-mcp.git
cd google-multi-account-mcp
npm install
cp .env.example .env      # fill it in — see Setup below
npm run migrate           # creates the four tables
npm start

Then deploy it somewhere with a public HTTPS URL (Railway, Fly, Render, a VPS — anything that runs Node and reaches Postgres) and follow Setup.

Endpoints

Tools (54)

Every tool takes an optional account. On a search, omitting it fans the call out across every linked account and merges the results — the thing no single-account connector can do. On a write it names the one account to act on, so "create this event" is never ambiguous about whose calendar it lands in.

Gmail (23)

Calendar (9)

Shortened. The full README is on GitHub.