multi-google-calendar-gmail-mcp

One small Python file that gives Claude (or any MCP client) Gmail and Google Calendar across as many Google accounts as you want — a personal Gmail, three Workspace domains, whatever. Each account gets a nickname; every tool takes a nickname or "all" to sweep the whole fleet in one call.

"find every unread invoice across all five inboxes and label them Bookkeeping" — one tool call.

Why this one

• Multi-account is the whole design, not a bolt-on. Most self-hosted Gmail MCPs authenticate one account. Here, connecting another account is one command + one browser click, and cross-account operations are native.
• Minimal. One readable server.py, three dependencies. If you want to know what it does, you can just read it.
• Bring your own credentials. Nothing is hosted, nothing phones home. You create your own (free) Google Cloud OAuth client, and your account keys live in a git-ignored folder on your machine. This repo never sees them.

Pairs naturally with apple-suite-mcp: that one reads whatever your Mac's built-in apps already see (zero setup, macOS only); this one speaks Google's APIs directly (real labels, batch operations up to 500 messages, drafts, calendar invites with attendees) and runs anywhere Python runs — including a headless Linux box.

Setup

Requires uv (brew install uv on macOS).

git clone https://github.com/travisthetrashpanda/multi-google-calendar-gmail-mcp.git ~/multi-google-calendar-gmail-mcp

1. One-time Google Cloud setup (~15 min, free): follow SETUP.md — create a Cloud project, enable the Gmail and Calendar APIs, publish the consent screen (avoids 7-day token expiry), create a Desktop-app OAuth client, and drop credentials.json in this folder. Heads-up: Google rejects app names containing the word "Google".
2. Connect the accounts you choose (repeat per account, any alias you like — only accounts you connect are ever visible):

   cd ~/multi-google-calendar-gmail-mcp
   uv run python server.py connect work
   uv run python server.py connect personal
   

   Changed your mind? uv run python server.py disconnect work deletes that account's key.
3. Verify: uv run python server.py check
4. Register with your MCP client — e.g. Claude Code:

   claude mcp add --scope user google -- uv run --directory ~/multi-google-calendar-gmail-mcp python server.py
   

   or in a JSON MCP config:

   {
     "mcpServers": {
       "google": {
         "command": "uv",
         "args": ["run", "--directory", "/Users/YOU/multi-google-calendar-gmail-mcp", "python", "server.py"]
       }
     }
   }
   

Tools

Area	Tools
Accounts	accounts_list, check
Gmail	gmail_search (full Gmail query syntax), gmail_read, gmail_labels, gmail_modify (batch label/archive/mark-read, ≤500 ids), gmail_draft, gmail_send
Calendar	calendar_list, calendar_events, calendar_create_event (with attendee invitations)

Test any tool from the command line:

uv run python server.py test gmail_search '{"query": "is:unread", "account": "all", "limit": 5}'

Scoping access (optional)

You already control access by choosing what to connect — but if you want a client to see only a subset of connected accounts (or to remove tools entirely), copy config.example.json to config.json:

{
  "accounts": ["work", "personal"],
  "disabled_tools": ["gmail_send"]
}

Accounts not listed become invisible to every tool; tools in disabled_tools are never even registered with the MCP client. Omit a key (or the whole file) to allow everything. check reports active scoping.

Safety notes

• There is deliberately no delete/trash tool — the most destructive operation is archiving (removing from inbox), which is reversible.
• gmail_send and attendee invitations send real email; MCP clients should confirm with the user first.
• credentials.json and tokens/ are git-ignored. Treat the tokens/ folder like passwords — don't put it in cloud-synced directories.

Credits

Sibling project of apple-suite-mcp; the two split the work of giving an AI assistant a complete view of your accounts — locally-visible vs. API-native.

Say thanks

This project is free to use, no strings attached. If it's useful to you, a ⭐ on this repo or a shout-out to @travisthetrashpanda is always appreciated — and if you build something on top of it, a link back here helps others find it.

License

MIT