MCP server · Productivity

CalDAV Calendar MCP server

Let your AI read and change your calendar, tasks and dated notes on your own CalDAV server.

Productivity For executives and strategy For management Communication

This is a small helper that connects your AI assistant to your own calendar server. It works with the open CalDAV standard, which is what Nextcloud, Radicale, Fastmail, mailbox.org and iCloud use behind the scenes. It is handy if you keep your calendar on one of those and want your AI to look things up or add entries for you.

What is an MCP server? The 30-second version

On its own, your AI can only chat. An MCP server is a small helper program that gives it a new skill or a connection to an app. This one connects your AI to your CalDAV calendar, so when you ask about your week or want a meeting added, the AI can actually go and look or make the change on your server. Nothing goes through a company in the middle: the helper talks straight to the calendar account you already have.

What this MCP server does

You ask your AI something about your calendar, like what is on tomorrow or when you are free. The AI passes that request to this helper. The helper logs into your CalDAV server with the details you gave it, fetches or changes what you asked for, and hands the result back. Your AI then turns it into a normal answer in the chat. If a change would affect other people or a whole repeating series, it asks you first before doing it.

Flow diagram: you ask your AI “What is on my calendar tomorrow?”, the CalDAV Calendar MCP server connects it to Your calendar, and you get back A plain answer in the chat.

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What you can do with it

List your calendars and see what events are on
Find a free slot in your day or week
Create a new event with a title, time and place
Move or update an existing event
Keep a to-do list with tasks and mark them done
Write dated journal or note entries
Answer an invitation by changing your own status

Try asking your AI

“What is on my calendar tomorrow?”
“Find me a free hour on Thursday afternoon and book a call with Sam”
“Move my 3pm meeting to Friday at 10”
“Add a task to buy birthday presents before Saturday”
“Do I have anything on the 14th of September?”

What it gives back to you

You get back plain answers in the chat: a list of events with their times, a free slot suggestion, or a short confirmation that something was created, moved or marked done. Each entry comes with its time, its time zone and whether it lasts all day. When a change touches a whole repeating series or deletes something, the AI asks you to confirm before it goes ahead.

Before you start

What you need

A CalDAV calendar account (Nextcloud, Radicale, Baikal, SOGo, Fastmail, mailbox.org or iCloud)
An app-specific password from that service (a one-time password just for this app, not your main login)
Node.js 22 or newer, or Docker, on the computer running your AI app

Good to know

It can change and delete entries in your calendar, so it asks you to confirm before anything irreversible, and you can set it to read-only if you prefer.

Install it with your AI

Add CalDAV Calendar MCP server to your AI, no technical skills needed

You don't install anything by hand. You copy one prompt, paste it into an AI that can work on your computer, and it checks, installs and connects the server for you, asking you when it needs something.

Sign in to get the install prompt

Members get a ready-made prompt that lets the Claude desktop app check CalDAV Calendar MCP server, install it and connect it for them, step by step. You don't need any technical skills: you copy, paste and answer a few questions. Your connected AI can also find and install any of the 4,066 MCP servers here for you.