mcp-google

MCP server for Google APIs — Gmail and Calendar tools for LLM agents.

Install

# Run directly with uvx (no install needed)
uvx mcp-google

# Or install with pip
pip install mcp-google

Environment Variables

Variable	Description
`GOOGLE_CLIENT_ID`	OAuth2 client ID from Google Cloud Console
`GOOGLE_CLIENT_SECRET`	OAuth2 client secret
`GOOGLE_ACCOUNTS_JSON`	JSON array of account configs (see below)

GOOGLE_ACCOUNTS_JSON format

[
  {"email": "personal@gmail.com", "refresh_token": "1//..."},
  {"email": "work@company.com", "refresh_token": "1//..."}
]

The first account in the array is used as default when no account parameter is specified.

Tools

Phase 1 — Read-only

Tool	Parameters	Description
`gmail_list_unread`	`account?`, `max_results?`	List unread emails (subject, sender, date, snippet)
`gmail_get_message`	`message_id`, `account?`	Get full email content by ID
`calendar_today`	`account?`	Today's events
`calendar_week`	`account?`	This week's agenda

Phase 2 — Write

Tool	Parameters	Description
`gmail_send`	`to`, `subject`, `body`, `account?`	Send an email
`calendar_create_event`	`title`, `start`, `end`, `account?`	Create a calendar event

OAuth Setup

Go to Google Cloud Console
Create a project (or select existing)
Enable Gmail API and Google Calendar API
Go to Credentials > Create Credentials > OAuth 2.0 Client ID
- Application type: Desktop app
- Note the Client ID and Client Secret
Configure OAuth consent screen with required scopes:
- https://www.googleapis.com/auth/gmail.readonly
- https://www.googleapis.com/auth/gmail.send
- https://www.googleapis.com/auth/calendar.readonly
- https://www.googleapis.com/auth/calendar.events
Obtain refresh tokens for each account using the OAuth2 flow
Set environment variables (copy .env.example to .env and fill in values)

Obtaining Refresh Tokens

Use the Google OAuth Playground or run a local OAuth flow:

# Quick method via oauth2l
pip install google-auth-oauthlib
python -c "
from google_auth_oauthlib.flow import InstalledAppFlow
flow = InstalledAppFlow.from_client_config(
    {'installed': {'client_id': 'YOUR_CLIENT_ID', 'client_secret': 'YOUR_SECRET', 'auth_uri': 'https://accounts.google.com/o/oauth2/auth', 'token_uri': 'https://oauth2.googleapis.com/token'}},
    scopes=['https://www.googleapis.com/auth/gmail.readonly', 'https://www.googleapis.com/auth/gmail.send', 'https://www.googleapis.com/auth/calendar.readonly', 'https://www.googleapis.com/auth/calendar.events']
)
creds = flow.run_local_server(port=0)
print(f'Refresh token: {creds.refresh_token}')
"

Running

# As MCP server (stdio transport)
mcp-google

# Or directly
python -m mcp_google.server

Claude Desktop config

{
  "mcpServers": {
    "google": {
      "command": "mcp-google",
      "env": {
        "GOOGLE_CLIENT_ID": "...",
        "GOOGLE_CLIENT_SECRET": "...",
        "GOOGLE_ACCOUNTS_JSON": "[{\"email\": \"me@gmail.com\", \"refresh_token\": \"...\"}]"
      }
    }
  }
}

License

MIT