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": "[email protected]", "refresh_token": "1//..."},
  {"email": "[email protected]", "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

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\": \"[email protected]\", \"refresh_token\": \"...\"}]"
      }
    }
  }
}

License

MIT