Fantastical MCP Server

Official Flexibits connector that lets Claude read, create, reschedule, and delete events in Fantastical on macOS using natural language.

Collaboration by Flexibits None active

Docs

Overview

The Fantastical Connector is an official MCP server built and maintained by Flexibits, the makers of the Fantastical calendar app for macOS. It bridges Claude Desktop and the locally installed Fantastical app, letting Claude inspect your schedule and manage events through normal conversation without leaving the chat window. The connector leverages Fantastical's existing natural language parser, so phrases like "next week," "end of the day," "after lunch," or "sometime Thursday" are interpreted correctly when Claude creates or moves events.

The connector exposes four capabilities: searching events by name or date, creating new events, updating or rescheduling existing events, and deleting events. Each capability can be individually configured in Claude's connector settings to Always allow, Needs Approval, or Blocked, so users can let calendar reads happen automatically while requiring confirmation before any write or delete action. When events are created or modified, you receive a real-time notification in Fantastical.

This is a local connector: it runs on the Mac alongside Fantastical and the Claude Desktop app. There are no API keys to manage and no remote server URL to configure, because the connector talks directly to the Fantastical engine on your device. It requires Fantastical 4.1.10 or later and a current version of Claude Desktop.

Tools

Tool	Description
`Search events`	Get information about events in your calendar by name or date range.
`Create event`	Create a new calendar event using Fantastical's natural language parser.
`Update event`	Rename, reschedule, or otherwise modify an existing event.
`Delete event`	Delete an existing event from the calendar.

Setup Guide

Prerequisites

macOS with Fantastical 4.1.10 or later installed
Claude Desktop app (download from claude.ai)

Installation

The Fantastical Connector is installed from inside Claude Desktop, not via a JSON config file or terminal command.

Open the Claude Desktop app
Open Settings, then choose Connectors
Click Browse connectors and search for Fantastical
Click Install on the Fantastical connector
Toggle the connector on, then click Configure to set per-tool permissions

Permission Configuration

Each tool can be set to one of three levels:

Always allow: Claude can use the tool without prompting
Needs Approval: Claude must request permission for each call
Blocked: Claude cannot use the tool

A common configuration is to set the read tool to Always allow and the create, update, and delete tools to Needs Approval.

Notes

No API key, OAuth, or environment variables are required
The connector communicates with the local Fantastical app on your Mac
Calendar accounts (iCloud, Google, Exchange, etc.) are accessed through whatever is already configured inside Fantastical

Use Cases

Ask Claude for a summary of your week or day without opening the calendar app
Have Claude find an open 1.5 hour slot in the next two weeks for a meeting and book it
Create events from meeting notes or email threads using natural phrases like "lunch with Sam Thursday after 1pm"
Bulk reschedule or rename events that match a search, for example moving every "Standup" next week by 30 minutes
Clean up the calendar by asking Claude to find and delete duplicate or obsolete events

Example Prompts

"What's on my schedule for the rest of this week?"
"Find a 1.5 hour slot for an app design meeting in the next two weeks and book it."
"Create a recurring 30 minute coffee with Alex every Tuesday at 9am starting next week."
"Move my 3pm Friday review to Monday at 10am and rename it 'Q3 Review'."
"Delete every event titled 'Hold' on my calendar for next month."

Pros

Official connector built and maintained by Flexibits, the maker of Fantastical
No API keys, OAuth, or config files needed; install entirely from Claude Desktop's connector browser
Uses Fantastical's mature natural language parser, so conversational time expressions work reliably
Granular per-tool permissions let you separate read access from write and delete

Limitations

macOS only, since it depends on a local Fantastical installation
Requires Claude Desktop specifically; not documented for other MCP clients like Cursor or Windsurf
Requires Fantastical 4.1.10 or later, which is a paid app with subscription features

Alternatives

Apple Calendar / iCal MCP servers (community-built) that talk to the macOS Calendar app directly via AppleScript
Google Calendar MCP servers for managing Google Calendar through its API on any platform
Community Fantastical MCP projects such as aplaceforallmystuff/mcp-fantastical for users who want a self-hosted, open-source implementation