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PsychQuantMCP SERVER

Che Ical MCP

Drive macOS Calendar and Reminders from a conversation — events, reminders, tags, batch edits, and an undo when one goes wrong.

by PsychQuant ↗Calendars, Meetings & SchedulingCommunity

LABSCO SUMMARY

Reminders and tasks, not just calendar events — with an undo behind every write.

Most calendar servers stop at events; this one drives Reminders too, including hashtag tags, tag search and usage counts that Reminders.app itself exposes no public API for. Writes are checked on the way in — duplicate detection, conflict checks, dry-run previews on batch deletes — and undo walks back the last operation when one gets through anyway.

What it is

A Swift MCP server built on EventKit, the framework the macOS Calendar and Reminders apps use themselves. It reads and writes both — calendars, events, reminders and their tags — against whatever accounts your Mac already syncs: iCloud, Google, Outlook/Exchange, CalDAV or local.

What you get

  • Calendars and reminder lists together: list_calendars, plus create_calendar, update_calendar to rename or recolour, and delete_calendar
  • Events with alerts, location, URL and a per-event timezone — create_event, update_event, delete_event, and list_events with filter, sort and limit
  • Reminders as first-class records, not an afterthought: create_reminder, complete_reminder, search_reminders by keyword or tag, list_reminder_tags with usage counts
  • Quick ranges instead of date arithmetic — list_events_quick takes today, tomorrow, this_week, next_7_days
  • Checks before a write lands: check_conflicts over a time range, find_duplicate_events across calendars
  • Batch work with a preview — create_events_batch, move_events_batch, and delete_events_batch with dry-run
  • undo, redo and undo_history over the most recent calendar and reminder operations
  • Same-name calendars told apart by source: calendar_source picks the iCloud “Work” over the Google one

Requirements

macOS 14.0 or later, and no account or key — it reaches your calendars through the ones macOS already holds. The registry entry io.github.PsychQuant/che-ical-mcp ships an .mcpb bundle over stdio for Claude Desktop; Claude Code can add the repo as a plugin marketplace, or register the standalone CheICalMCP binary. On first use macOS asks for Calendar and Reminders access, and that dialog is attributed to the app that launched the server — under Terminal or iTerm2 it appears, under VS Code it may not.

Setup effort

One command — mkdir -p ~/bin && curl -L https://github.com/PsychQuant/che-ical-mcp/releases/latest/download/CheICalMCP -o ~/bin/CheICalMCP && chmod +x ~/bin/CheICalMCP

See installation options