gcal-fast-mcp
A Google Calendar MCP server built with FastMCP, providing tools for event CRUD, calendar management, and availability queries via the Google Calendar API.
README
gcal-fast-mcp
Google Calendar MCP server built with FastMCP. Provides 10 tools for calendar management, event CRUD, and availability queries via the Google Calendar API v3.
Setup
1. Google OAuth Credentials
Place your Google Cloud OAuth client credentials at ~/.gcal-mcp/gcp-oauth.keys.json (or in the project directory — they'll be copied automatically).
If you already have a GCP project configured for another Google API (e.g. gmail-fast-mcp), you can reuse the same OAuth client — just enable the Google Calendar API in that project.
2. Authenticate
uv run python -m gcal_fast_mcp auth
This opens a browser for the OAuth flow and saves tokens to ~/.gcal-mcp/credentials.json.
For cloud environments with a custom callback URL:
uv run python -m gcal_fast_mcp auth https://your-domain.com/oauth2callback
3. Run the Server
uv run python -m gcal_fast_mcp
MCP Client Configuration
{
"mcpServers": {
"google-calendar": {
"command": "uv",
"args": ["--directory", "/path/to/gcal-fast-mcp", "run", "google-calendar-fast-mcp"]
}
}
}
Tools
| Tool | Description |
|---|---|
list_calendars |
List all calendars the user has access to |
get_calendar |
Get details of a specific calendar |
list_events |
List events within a time range (supports search, recurring expansion) |
get_event |
Get full details of a single event |
create_event |
Create a new event with attendees, location, etc. |
update_event |
Update an existing event (partial updates supported) |
delete_event |
Delete an event |
quick_add |
Create an event from natural language (e.g. "Lunch tomorrow at noon") |
check_availability |
Check free/busy status for one or more calendars |
Configuration
Environment variables (prefix GCAL_):
| Variable | Default | Description |
|---|---|---|
GCAL_OAUTH_PATH |
~/.gcal-mcp/gcp-oauth.keys.json |
OAuth client secrets file |
GCAL_CREDENTIALS_PATH |
~/.gcal-mcp/credentials.json |
Saved OAuth tokens |
GCAL_DEFAULT_CALENDAR |
primary |
Default calendar ID |
GCAL_MAX_RESULTS |
50 |
Default max events returned |
Google Calendar API Scopes
calendar— Full calendar accesscalendar.events— Event CRUD operations
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