Calendar MCP

A Deno monorepo containing packages for macOS Calendar access:

• @wyattjoh/calendar - Core library for read-only macOS Calendar database access

• @wyattjoh/calendar-mcp - Model Context Protocol (MCP) server for LLM integration

Features

• Search calendar events by title/summary

• Get recent past events

• Get upcoming events

• Retrieve events within date ranges

• Get today's events with conflict detection

• Get detailed event information including location, URL, and recurrence

• Filter rescheduled events

Related MCP server: MCP iCal Server

Requirements

• macOS (Calendar is only available on macOS)

• Deno 2.x or later

• Read access to ~/Library/Calendars/Calendar.sqlitedb

Packages

@wyattjoh/calendar

Core library for accessing Calendar data:

deno add @wyattjoh/calendar

import { openDatabase, searchEvents } from "@wyattjoh/calendar";

const db = openDatabase();
try {
  const events = searchEvents(db, { query: "meeting", limit: 10 });
  console.log(events);
} finally {
  db.close();
}

See full documentation

@wyattjoh/calendar-mcp

MCP server for LLM integration:

# Run directly from JSR
deno run --allow-read --allow-env --allow-ffi --allow-sys jsr:@wyattjoh/calendar-mcp

# Or install globally
deno install --global --allow-read --allow-env --allow-ffi --allow-sys -n calendar-mcp jsr:@wyattjoh/calendar-mcp

For Claude Desktop app integration, add this to your claude_desktop_config.json:

{
  "mcpServers": {
    "calendar": {
      "command": "deno",
      "args": [
        "run",
        "--allow-read",
        "--allow-env",
        "--allow-ffi",
        "--allow-sys",
        "jsr:@wyattjoh/calendar-mcp"
      ]
    }
  }
}

Option 2: From Source

1. Clone this repository

2. Run the server:

   cd packages/calendar-mcp
   deno run --allow-read --allow-env --allow-ffi --allow-sys mod.ts
   # Or use the task:
   deno task dev

Available Tools

1. get-recent-events - Get recent past calendar events

   • limit (optional): Number of events (1-100, default: 10)

   • includeRescheduled (optional): Include original rescheduled events (default: false)

2. get-upcoming-events - Get upcoming calendar events

   • limit (optional): Number of events (1-100, default: 10)

   • includeRescheduled (optional): Include original rescheduled events (default: false)

3. get-events-by-date-range - Get events within a date range

   • startDate (required): Start date in ISO format (e.g., "2024-01-01")

   • endDate (required): End date in ISO format (e.g., "2024-01-31")

   • includeRescheduled (optional): Include original rescheduled events (default: false)

4. search-events - Search for events by title/summary

   • query (required): Search query for event titles

   • limit (optional): Maximum results (1-100, default: 20)

   • timeRange (optional): "all", "past", or "future" (default: "all")

   • includeRescheduled (optional): Include original rescheduled events (default: false)

5. get-todays-events - Get all events scheduled for today

   • includeRescheduled (optional): Include original rescheduled events (default: false)

6. get-event-details - Get detailed information about a specific event

   • eventId (required): The ROWID of the event

Response Format

All tools return calendar events in this format:

{
  "id": 12345,
  "title": "Team Meeting",
  "startTime": "2024-01-15T10:00:00.000Z",
  "endTime": "2024-01-15T11:00:00.000Z",
  "allDay": false,
  "status": "confirmed",
  "isRescheduled": false
}

Detailed events (from get-event-details) include additional fields:

{
  "id": 12345,
  "title": "Team Meeting",
  "startTime": "2024-01-15T10:00:00.000Z",
  "endTime": "2024-01-15T11:00:00.000Z",
  "allDay": false,
  "status": "confirmed",
  "isRescheduled": false,
  "description": "Weekly sync with the team",
  "location": "Conference Room A",
  "url": "https://meet.example.com/team",
  "recurrenceRule": "FREQ=WEEKLY;INTERVAL=1",
  "calendar": "Work"
}

Security Notes

• This server runs with read-only access to the Calendar database

• No events can be created, modified, or deleted

• The server only accesses local data

Development

This is a Deno workspace monorepo. All commands run from the root affect all packages.

# Clone the repository
git clone https://github.com/wyattjoh/calendar-mcp.git
cd calendar-mcp

# Format all code
deno task fmt

# Lint all packages
deno task lint

# Type check all packages
deno task check

# Run MCP server locally
cd packages/calendar-mcp
deno task dev

# Publish packages (CI/CD)
deno publish

Working on Individual Packages

# Work on @wyattjoh/calendar
cd packages/calendar
deno fmt
deno lint
deno check mod.ts

# Work on @wyattjoh/calendar-mcp
cd packages/calendar-mcp
deno run --allow-read --allow-env --allow-ffi --allow-sys mod.ts

License

MIT