Allows AI agents to read and write iCloud Calendar over CalDAV, including listing calendars, listing events with recurring events expanded, and creating, updating, or deleting events.
Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@icloud-calendar-mcp what's on my calendar tomorrow?"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
A remote MCP server that lets AI agents read and write your iCloud Calendar over CalDAV. It runs on Cloudflare Workers (the free plan is enough), so it works from Claude on the web, desktop, and mobile.
There is no shared public instance. You deploy your own copy to your Cloudflare account, and only you can authorize clients to use it.
Not affiliated with or endorsed by Apple. iCloud is a trademark of Apple Inc.
Tool | Description |
| Lists calendars that hold events (Reminders lists are excluded) |
| Lists events in a period, with recurring events expanded and times given with their UTC offset |
| Creates a timed or all-day event |
| Changes the title, time, location, or description, keeping alarms, attendees, and recurrence rules |
| Deletes an event |
Related MCP server: calendar-mcp
A Cloudflare account
An Apple Account with two-factor authentication
Create an app-specific password. Sign in at account.apple.com, open Sign-In and Security → App-Specific Passwords, and generate one. You can revoke it there at any time.
Sign in to Cloudflare. Deployment uses your Wrangler login, so no API token is needed:
bun install
bunx wrangler loginConfigure. Copy the example variables and fill them in. auth_password is the password you will type on the consent page when connecting a client; use at least 16 characters.
cp terraform/terraform.tfvars.example terraform/terraform.tfvarsDeploy.
terraform -chdir=terraform init
bun run plan # preview the changes
bun run deploy # apply themBoth build the Worker first and pass your Wrangler login to Terraform. For other Terraform commands, run scripts/terraform.sh <command>. In CI, set CLOUDFLARE_API_TOKEN and TF_VAR_account_id and they are used as is.
The server is served at https://icloud-calendar-mcp.<your-subdomain>.workers.dev/mcp. Your workers.dev subdomain is shown on the Workers overview page of the dashboard.
terraform.tfvars and the Terraform state contain your secrets. Both are git-ignored; keep them private, and keep the state in terraform/ so later deploys update the same resources.
To update to a newer version:
git pull
bun install
bun run deployOpen Settings → Connectors → Add custom connector in Claude, enter your /mcp URL, and keep the detected defaults (sign in now, Claude's public identity). Click Connect, check that the consent page shows claude.ai as a verified client, enter your auth_password, and click Allow.
Connectors added on the web are also available in the Claude mobile apps.
scripts/smoke.sh registers a test client, completes the OAuth flow, and calls list_calendars:
AUTH_PASSWORD=... scripts/smoke.sh https://icloud-calendar-mcp.<your-subdomain>.workers.devA PROPFIND ... failed: 401 result means the iCloud credentials are wrong.
MCP clients must complete OAuth 2.1 (with Client ID Metadata Documents or Dynamic Client Registration). Only someone who knows auth_password can approve a client, and password attempts are rate-limited to 5 per minute.
Your iCloud credentials stay in Worker secrets. Tools only accept URLs under your own calendars, so a client cannot redirect the credentials to another host.
Reminders are not available over CalDAV and are not supported.
update_event and delete_event act on a recurring event as a whole series; single occurrences cannot be changed or removed on their own.
Recurring events that would take too many iterations to expand (for example, a rule repeating every second) are left out of list_events and reported in its skipped field.
Workers Free allows 10 ms of CPU per request. Expanding a daily event that has repeated for decades can exceed it; the request then fails.
This server cannot be deployed
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Remote streamable-HTTP MCP server running on a single Cloudflare Worker. Your assistant gets live Airbnb, Amazon, Booking.com, Google Flights, Maps and Reddit data, social search on X, Instagram and TikTok, the Meta Ad Library, and image/video generation without any keys. Connect your own accounts to let it send WhatsApp or Telegram messages, work an IMAP inbox, manage Meta Ads campaigns and publish to X and LinkedIn. OAuth 2.1 with PKCE; stored credentials are AES-256-GCM encrypted.
