Google Calendar
Allow AI systems to list, create, update, and manage Google Calendar events.
Open source Open in the app JSON README (API)
About
Allow AI systems to list, create, update, and manage Google Calendar events.
Details
- Kind
- MCP servers
- Topic
- Productivity
- Publisher
- domdomegg
- Origin
- official
- Category
- ferramentas
- Transport
- local
- Version
- 1.1.3
- Stars
- 1
- Last push
- 2026-09-03T03:08:37Z
- Repository state
- ativo
- Language
- TypeScript
- Added
- 2026-08-29 03:02:43
- Updated
- 2026-08-29 03:02:43
- Origin id
io.github.domdomegg/google-cal-mcp
README
# google-cal-mcp
MCP server for Google Calendar - list, create, update, and manage calendar events.
## Use Cases
**Schedule meetings**: "Set up a 30-min sync with Sarah next week" → finds a free slot, creates the event with a Meet link, and sends the invite.
**RSVP to invites**: "Accept the team offsite but decline the vendor demo" → responds to pending invitations automatically.
**Find availability**: "When am I free this Thursday afternoon?" → queries your calendar and returns open slots.
**Reschedule events**: "Move my 1:1 with Alex to Friday at 2pm" → updates the event and notifies attendees.
**Daily briefing**: "What's on my calendar today?" → lists all events with times, locations, and attendees.
**Block focus time**: "Block 2 hours tomorrow morning for deep work" → creates a calendar event to protect your time.
(These are just examples - any workflow that needs calendar access can use this.)
## Setup
### 1. Create Google OAuth credentials
1. Go to [Google Cloud Console](https://console.cloud.google.com/)
2. Create a new project (or use existing)
3. Enable the Google Calendar API
4. Go to **APIs & Services** → **OAuth consent screen**, set up consent screen
5. Go to **APIs & Services** → **Credentials** → **Create Credentials** → **OAuth client ID**
6. Choose **Web application**
7. Add `http://localhost:3000/callback` to **Authorized redirect URIs**
8. Note your Client ID and Client Secret
### 2. Run the server
```bash
GOOGLE_CLIENT_ID='your-client-id' \
GOOGLE_CLIENT_SECRET='your-client-secret' \
MCP_TRANSPORT=http \
npm start
```
The server runs on `http://localhost:3000` by default. Change with `PORT=3001`.
### 3. Add to your MCP client
With the server running, follow the instructions on [install-mcp](https://adamjones.me/install-mcp/?url=http://localhost:3000/mcp), which generates the right config for your MCP client (Claude Code, Claude Desktop, Cursor, Cline, VS Code, and more).
## Architecture
This server acts as an **OAuth proxy** to Google:
```mermaid
graph LR
A[MCP client] <--> B[google-cal-mcp] <--> C[Google OAuth/API]
```
1. Server advertises itself as an OAuth authorization server via `/.well-known/oauth-authorization-server`
2. `/register` returns the Google OAuth client credentials
3. `/authorize` redirects to Google, encoding the client's callback URL in state
4. `/callback` receives the code from Google and forwards to the client's callback
5. `/token` proxies token requests to Google, injecting client credentials
6. `/mcp` handles MCP requests, using the bearer token to call Calendar API
The server holds no tokens or state - it just proxies OAuth to Google.
## Tools
| Tool | Description |
|------|-------------|
| **Calendars** | |
| `calendars_list` | List all calendars the user has access to |
| `calendarlist_insert` | Subscribe to a shared calendar |
| `calendarlist_update` | Update calendar settings (color, visibility, reminders) |
| `calendarlist_delete` | Unsubscribe from a calendar |
| **Events** | |
| `events_list` | List events in a time range with search/filter |
| `event_get` | Get details of a specific event |
| `event_create` | Create a new event with attendees and Meet link |
| `event_update` | Update an existing event |
| `event_delete` | Delete an event |
| `event_respond` | RSVP to an invitation (accept/decline/tentative) |
| `event_move` | Move event to a different calendar |
| `event_instances` | Get instances of a recurring event |
| **Availability** | |
| `freebusy_query` | Find free/busy times for scheduling |
| **Sharing** | |
| `acl_list` | List who has access to a calendar |
| **Colors** | |
| `colors_get` | Get available color palette for calendars/events |
## Calendar API Scopes
- `calendar` - Full access to calendars
- `calendar.events` - Read/write events
## Contributing
Pull requests are welcomed on GitHub! To get started:
1. Install Git and Node.js
2. Clone the repository
3. Install dependencies with `npm install`
4. Run `npm run test` to run tests
5. Build with `npm run build`
## Releases
Versions follow the [semantic versioning spec](https://semver.org/).
To release:
1. Use `npm version <major | minor | patch>` to bump the version
2. Run `git push --follow-tags` to push with tags
3. Wait for GitHub Actions to publish to the NPM registry.