ICS Calendar Server

A lightweight MCP (Model Context Protocol) server for reading ICS calendar feeds with proper recurring event expansion.

Features

• Fetch and parse ICS calendar feeds (Outlook, Google Calendar, etc.)
• Properly expands recurring events using recurring-ical-events
• Caches calendar data to reduce API calls
• Timezone-aware event handling
• Simple configuration via environment variables

Installation

Using uvx (recommended)

uvx --from git+https://github.com/adamchrabaszcz/ics-calendar-mcp ics-calendar-mcp

Using pip

pip install git+https://github.com/adamchrabaszcz/ics-calendar-mcp

From source

git clone https://github.com/adamchrabaszcz/ics-calendar-mcp
cd ics-calendar-mcp
pip install -e .

Configuration

Set the following environment variables:

Variable	Required	Default	Description
ICS_CALENDAR_URL	Yes	-	URL to the ICS calendar feed
ICS_CACHE_TTL	No	300	Cache duration in seconds
ICS_TIMEZONE	No	Europe/Warsaw	Default timezone for events

Example: Outlook Calendar

export ICS_CALENDAR_URL="https://outlook.office365.com/owa/calendar/[email protected]/yyy/calendar.ics"

MCP Tools

get_events_today

Get all calendar events for today.

{
  "date": "2024-03-10",
  "events": [...],
  "count": 3
}

get_events_range

Get events within a date range.

Parameters:

• start_date (string): Start date in ISO format (YYYY-MM-DD)
• end_date (string): End date in ISO format (YYYY-MM-DD)

{
  "start_date": "2024-03-01",
  "end_date": "2024-03-31",
  "events": [...],
  "count": 15
}

get_event_details

Get detailed information about a specific event.

Parameters:

• event_uid (string): The unique identifier of the event

list_recurring_events

List all recurring events with their recurrence rules.

{
  "events": [
    {
      "uid": "event-123",
      "summary": "Weekly Standup",
      "recurrence": {
        "frequency": "WEEKLY",
        "days": ["MO", "TU", "WE", "TH", "FR"],
        "description": "weekly on Monday, Tuesday, Wednesday, Thursday, Friday"
      }
    }
  ],
  "count": 5
}

search_events

Search for events matching a query.

Parameters:

• query (string): Search term
• start_date (string, optional): Start date for search range
• end_date (string, optional): End date for search range

Claude Code Configuration

Add to your ~/.claude/mcp.json:

{
  "mcpServers": {
    "ics-calendar": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/adamchrabaszcz/ics-calendar-mcp", "ics-calendar-mcp"],
      "env": {
        "ICS_CALENDAR_URL": "https://your-calendar-url.ics"
      }
    }
  }
}

Development

Setup

git clone https://github.com/adamchrabaszcz/ics-calendar-mcp
cd ics-calendar-mcp
pip install -e ".[dev]"

Run tests

pytest tests/

Run locally

ICS_CALENDAR_URL="https://your-calendar.ics" python -m ics_calendar_mcp

License

MIT