gmail-mcp-multi

A Gmail MCP server with native multi-account support. Manage multiple Gmail accounts from a single server instance.

Unlike other Gmail MCPs that require running separate server instances per account, this one lets you specify which account to use on each tool call—making it easy to manage personal and work inboxes from Claude Code, Cursor, or any MCP client.

Features

• Multi-account support - Single server instance, unlimited Gmail accounts
• Account aliases - Use friendly names like "work" or "personal" instead of email addresses
• Full Gmail API - Search, read, send, label, and manage emails
• Batch operations - Bulk modify or delete emails efficiently
• Auto token refresh - Handles OAuth token refresh automatically

Installation

npm install -g gmail-mcp-multi

Or run directly with npx:

npx gmail-mcp-multi

Quick Start

1. Set up Google Cloud OAuth

You'll need OAuth credentials from Google Cloud Console:

1. Go to Google Cloud Console
2. Create a new project (or use existing)
3. Enable the Gmail API
4. Create OAuth 2.0 credentials (Desktop app type)
5. Download the credentials JSON

2. Configure the MCP

Create ~/.gmail-mcp/oauth-keys.json with your OAuth credentials.

3. Add to your MCP client

Claude Code (~/.claude/settings.json):

{
  "mcpServers": {
    "gmail": {
      "command": "npx",
      "args": ["gmail-mcp-multi"]
    }
  }
}

4. Authenticate accounts

Once the MCP is running, use the authenticate tool:

authenticate({ alias: "work", email: "you@company.com" })
authenticate({ alias: "personal", email: "you@gmail.com" })

5. Use it!

search_emails({ account: "work", query: "in:inbox is:unread" })
search_emails({ account: "personal", query: "from:mom" })

Tools

All tools that interact with Gmail require an account parameter (alias or email).

Account Management

Tool	Description
list_accounts	List all configured accounts and auth status
authenticate	Add or re-authenticate an account

Email Operations

Tool	Description
search_emails	Search emails using Gmail query syntax
read_email	Get full content of an email by ID
send_email	Send a new email
draft_email	Create a draft
modify_email	Add/remove labels, mark read/unread
delete_email	Trash or permanently delete
batch_modify_emails	Bulk label operations
batch_delete_emails	Bulk delete

Label Management

Tool	Description
list_labels	Get all labels for an account
create_label	Create a new label
delete_label	Delete a label

Configuration

Credentials are stored in ~/.gmail-mcp/:

~/.gmail-mcp/
├── config.json           # Account aliases and settings
├── oauth-keys.json       # Your Google OAuth app credentials
└── accounts/
    ├── work/
    │   └── credentials.json
    └── personal/
        └── credentials.json

Development

git clone https://github.com/dmorrill/gmail-mcp-multi.git
cd gmail-mcp-multi
npm install
npm run build
npm run dev

Contributing

Contributions welcome! Please see CONTRIBUTING.md for guidelines.

License

MIT