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

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

Phase 2 — Write

OAuth Setup

1. Go to Google Cloud Console
2. Create a project (or select existing)
3. Enable Gmail API and Google Calendar API
4. Go to Credentials > Create Credentials > OAuth 2.0 Client ID
   • Application type: Desktop app
   • Note the Client ID and Client Secret
5. 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
6. Obtain refresh tokens for each account using the OAuth2 flow
7. 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