loading…
Search for a command to run...
loading…
Native macOS Calendar & Reminders MCP server with 25 tools via Apple EventKit. Supports recurring events, location-based reminder triggers, multi-keyword search
Native macOS Calendar & Reminders MCP server with 25 tools via Apple EventKit. Supports recurring events, location-based reminder triggers, multi-keyword search, duplicate detection, conflict checking, and batch operations across iCloud/Google/Exchange calendars.
macOS Calendar & Reminders MCP server - Native EventKit integration for complete calendar and task management.
| Feature | Other Calendar MCPs | che-ical-mcp |
|---|---|---|
| Calendar Events | Yes | Yes |
| Reminders/Tasks | No | Yes |
| Reminder #Tags | No | Yes (MCP-level) |
| Multi-keyword Search | No | Yes |
| Duplicate Detection | No | Yes |
| Conflict Detection | No | Yes |
| Batch Operations | No | Yes |
| Local Timezone | No | Yes |
| Source Disambiguation | No | Yes |
| Create Calendar | Some | Yes |
| Delete Calendar | Some | Yes |
| Event Reminders | Some | Yes |
| Location & URL | Some | Yes |
| Language | Python | Swift (Native) |
Download the latest .mcpb file from Releases and double-click to install.
Edit ~/Library/Application Support/Claude/claude_desktop_config.json:
{
"mcpServers": {
"che-ical-mcp": {
"command": "/usr/local/bin/che-ical-mcp"
}
}
}
The plugin includes slash commands (/today, /week, /quick-event, /remind), skills, and a PreToolUse hook that automatically verifies day-of-week when creating or updating events — preventing date/weekday mismatch errors.
Two steps — register the marketplace once, then install the plugin:
# 1. Register the marketplace (one-time)
claude plugin marketplace add PsychQuant/psychquant-claude-plugins
# 2. Install the plugin
claude plugin install che-ical-mcp@psychquant-claude-plugins
Inside Claude Code? The slash-command equivalents
/plugin marketplace add PsychQuant/psychquant-claude-pluginsand/plugin install che-ical-mcp@psychquant-claude-pluginswork the same way.
Note: The plugin wraps the MCP binary with auto-download. If the binary is not found at
~/bin/CheICalMCP, it will be downloaded from GitHub Releases on first use.
If you only need the MCP server without plugin features:
# Create ~/bin if needed
mkdir -p ~/bin
# Download the latest release
curl -L https://github.com/PsychQuant/che-ical-mcp/releases/latest/download/CheICalMCP -o ~/bin/CheICalMCP
chmod +x ~/bin/CheICalMCP
# Add to Claude Code
# --scope user : available across all projects (stored in ~/.claude.json)
# --transport stdio: local binary execution via stdin/stdout
# -- : separator between claude options and the command
claude mcp add --scope user --transport stdio che-ical-mcp -- ~/bin/CheICalMCP
💡 Tip: Always install the binary to a local directory like
~/bin/. Avoid placing it in cloud-synced folders (Dropbox, iCloud, OneDrive) as file sync operations can cause MCP connection timeouts.
git clone https://github.com/PsychQuant/che-ical-mcp.git
cd che-ical-mcp
make release && make install
⚠️ Swift 6 / Xcode 18 users: Do not use
swift builddirectly — upstream MCP SDK has a concurrency error (swift-sdk#214). The Makefile auto-detects this and falls back to Swift 5 language mode.
On first use, macOS will prompt for Calendar and Reminders access - click "Allow".
All 29 tools can be invoked directly from the command line without running the MCP server:
# Flag-based: --key value pairs
CheICalMCP --cli list_events --start_date 2026-03-29 --end_date 2026-03-30
# JSON via stdin
echo '{"tool":"list_calendars","arguments":{}}' | CheICalMCP --cli
# Use with Claude Code via shell
claude -p "Run: ~/bin/CheICalMCP --cli list_events_quick --range today"
Useful for launchd jobs, shell scripts, CI pipelines, and agents that prefer subprocess over MCP protocol. TCC permissions still required — run CheICalMCP --setup first if needed.
| Tool | Description |
|---|---|
list_calendars |
List all calendars and reminder lists (includes source_type) |
create_calendar |
Create a new calendar |
delete_calendar |
Delete a calendar |
update_calendar |
Rename a calendar or change its color (v0.9.0) |
| Tool | Description |
|---|---|
list_events |
List events with filter/sort/limit (v1.0.0) |
create_event |
Create an event (with reminders, location, URL, per-event timezone) |
update_event |
Update an event (including timezone, recurrence, span for recurring) |
delete_event |
Delete an event (with occurrence support for recurring) |
| Tool | Description |
|---|---|
list_reminders |
List reminders with filter/sort/limit, tags extraction (v1.0.0) |
create_reminder |
Create a reminder with due date, tags (v1.3.0) |
update_reminder |
Update a reminder (including tags, clear_due_date) (v1.3.0) |
complete_reminder |
Mark as completed/incomplete |
delete_reminder |
Delete a reminder |
search_reminders |
Search reminders by keyword(s) or tag (v1.3.0) |
list_reminder_tags |
List all unique tags with usage counts (v1.3.0) |
cleanup_completed_reminders |
Delete all completed reminders in one call, dry_run preview by default (v1.7.2) |
| Tool | Description |
|---|---|
search_events |
Search events by keyword(s) with AND/OR matching |
list_events_quick |
Quick shortcuts: today, tomorrow, this_week, next_7_days, etc. |
create_events_batch |
Create multiple events at once (with per-event timezone) |
check_conflicts |
Check for overlapping events in a time range |
copy_event |
Copy an event to another calendar (with optional move) |
move_events_batch |
Move multiple events to another calendar |
delete_events_batch |
Delete events by IDs or date range, with dry-run preview (v1.0.0) |
find_duplicate_events |
Find duplicate events across calendars (v0.5.0) |
create_reminders_batch |
Create multiple reminders at once (v0.9.0) |
delete_reminders_batch |
Delete multiple reminders at once (v0.9.0) |
| Tool | Description |
|---|---|
undo |
Undo the most recent calendar/reminder operation |
redo |
Redo the last undone operation |
undo_history |
List undoable operations with timestamps |
che-ical-mcp.mcpb from Releases.mcpb file to installDownload the binary:
curl -L https://github.com/PsychQuant/che-ical-mcp/releases/latest/download/CheICalMCP -o /usr/local/bin/che-ical-mcp
chmod +x /usr/local/bin/che-ical-mcp
Edit ~/Library/Application Support/Claude/claude_desktop_config.json:
{
"mcpServers": {
"che-ical-mcp": {
"command": "/usr/local/bin/che-ical-mcp"
}
}
}
Restart Claude Desktop
# Create ~/bin if needed
mkdir -p ~/bin
# Download the binary
curl -L https://github.com/PsychQuant/che-ical-mcp/releases/latest/download/CheICalMCP -o ~/bin/CheICalMCP
chmod +x ~/bin/CheICalMCP
# Register with Claude Code (user scope = available in all projects)
claude mcp add --scope user --transport stdio che-ical-mcp -- ~/bin/CheICalMCP
git clone https://github.com/PsychQuant/che-ical-mcp.git
cd che-ical-mcp
make release && make install
# Register with Claude Code
claude mcp add --scope user --transport stdio che-ical-mcp -- ~/bin/CheICalMCP
⚠️ Swift 6 / Xcode 18 使用者： 不要直接使用
swift build— 上游 MCP SDK 有 concurrency 錯誤（swift-sdk#214）。Makefile 會自動偵測並回退到 Swift 5 語言模式。
On first use, macOS will prompt for Calendar and Reminders access. Click Allow for both.
⚠️ macOS Sequoia (15.x) Note: The permission dialog is attributed to the parent application that launched the MCP server, not the binary itself. This means:
Environment Permission Attributed To Claude Desktop Claude Desktop.app ✅ (works automatically) Claude Code in Terminal.app Terminal.app ✅ (works automatically) Claude Code in VS Code VS Code ❌ (may not show dialog) Claude Code in iTerm2 iTerm2 ✅ (works automatically) If the permission dialog doesn't appear (common with VS Code), you need to add
NSCalendarsFullAccessUsageDescriptionto VS Code's Info.plist:# Add calendar usage description to VS Code /usr/libexec/PlistBuddy -c "Add :NSCalendarsFullAccessUsageDescription string 'VS Code needs calendar access for MCP extensions.'" \ "/Applications/Visual Studio Code.app/Contents/Info.plist" /usr/libexec/PlistBuddy -c "Add :NSRemindersFullAccessUsageDescription string 'VS Code needs reminders access for MCP extensions.'" \ "/Applications/Visual Studio Code.app/Contents/Info.plist" # Re-sign VS Code (required after Info.plist modification) codesign -s - -f --deep "/Applications/Visual Studio Code.app" # Restart VS Code, then the permission dialog will appearNote: This modification will be overwritten when VS Code updates. You'll need to re-apply it after each VS Code update.
All date parameters now accept 4 formats:
| Format | Example | Interpretation |
|---|---|---|
| Full ISO8601 | "2026-02-06T14:00:00+08:00" |
Exact date and time (offset preserved) |
| Without timezone | "2026-02-06T14:00:00" |
Uses event timezone if provided, otherwise system timezone |
| Date only | "2026-02-06" |
Midnight in event timezone or system timezone |
| Time only | "14:00" |
Today at that time |
Set the display timezone for individual events — essential for multi-timezone travel itineraries.
"Create a flight departure at 09:14 Berlin time"
→ create_event(title: "Flight LH123", start_time: "2026-04-08T09:14:00", timezone: "Europe/Berlin", ...)
"Update the hotel check-in to Dubai time"
→ update_event(event_id: "...", timezone: "Asia/Dubai")
"Remove the custom timezone from an event"
→ update_event(event_id: "...", clear_timezone: true)
timezone parameter accepts IANA identifiers (e.g., Europe/Berlin, America/New_York, Asia/Taipei)timezone is provided, naive datetimes (without offset) are interpreted in that timezonetimezone field and formats start_date_local/end_date_local accordinglycreate_event, update_event, and create_events_batchEvent responses include participant information when available. These fields are read-only due to EventKit limitations — they cannot be set or modified through the MCP.
Available in: list_events, search_events, list_events_quick, check_conflicts
attendees (array, optional) — Present when the event has participants. Each attendee object contains:
| Field | Type | Description |
|---|---|---|
name |
string or null | Display name, null if not in Address Book |
email |
string | Email address extracted from participant URL |
role |
string | One of: unknown, required, optional, chair, non_participant |
status |
string | One of: unknown, pending, accepted, declined, tentative, delegated, completed, in_process |
type |
string | One of: unknown, person, room, resource, group |
is_current_user |
boolean | Whether this participant is the current user |
organizer (object, optional) — Present when the event has an organizer. Contains:
| Field | Type | Description |
|---|---|---|
name |
string or null | Display name |
email |
string | Email address |
is_current_user |
boolean | Whether the organizer is the current user |
Note: Both fields are omitted when the event has no participants or organizer (e.g., local calendar events created without invitees).
Calendar names are now matched case-insensitively. If not found, the error message lists all available calendars.
list_events: filter (all/past/future/all_day), sort (asc/desc), limitlist_reminders: filter (all/incomplete/completed/overdue), sort (due_date/creation_date/priority/title), limitdelete_events_batch: date range mode (before_date/after_date) + dry_run previewBreaking Change:
list_eventsandlist_remindersnow return{events/reminders: [...], metadata: {...}}instead of a plain array.
"List all my calendars"
"What's on my schedule next week?"
"Create a meeting tomorrow at 2 PM titled 'Team Sync'"
"Add a dentist appointment on Friday at 10 AM with location '123 Main St'"
"Delete the meeting called 'Cancelled Meeting'"
"List my incomplete reminders"
"Show all reminders in my Shopping list"
"Add a reminder: Buy milk"
"Create a reminder to call mom tomorrow at 5 PM"
"Mark 'Buy milk' as completed"
"Delete the reminder about groceries"
"Remove the due date from 'Buy groceries'"
→ update_reminder(reminder_id: "...", clear_due_date: true)
"Search for events containing 'meeting'"
"Search for events with both 'project' AND 'review'"
"What do I have today?"
"Show me this week's schedule"
"Are there any conflicts if I schedule a meeting from 2-3 PM?"
"Create 3 weekly team meetings for the next 3 weeks"
"Copy the dentist appointment to my Work calendar"
"Move all events from 'Old Calendar' to 'New Calendar'"
"Delete all the cancelled events"
"Find duplicate events between 'IDOL' and 'Idol' calendars"
"Show my next 5 upcoming events"
→ list_events(start_date: "2026-02-06", end_date: "2026-12-31", filter: "future", sort: "asc", limit: 5)
"Show my overdue reminders"
→ list_reminders(filter: "overdue")
"Preview which events would be deleted from 'Old Calendar' before 2025"
→ delete_events_batch(calendar_name: "Old Calendar", before_date: "2025-01-01", dry_run: true)
"Create an event at 2 PM" (no need for full ISO8601!)
→ create_event(start_time: "14:00", end_time: "15:00", ...)
Works with any calendar synced to macOS Calendar app:
If you have calendars with the same name from different sources (e.g., "Work" in both iCloud and Google), use the calendar_source parameter:
"Create an event in my iCloud Work calendar"
→ create_event(calendar_name: "Work", calendar_source: "iCloud", ...)
"Show events from my Google Work calendar"
→ list_events(calendar_name: "Work", calendar_source: "Google", ...)
If ambiguity is detected, the error message will list all available sources.
| Problem | Solution |
|---|---|
| Server disconnected | Rebuild with make release && make install |
| Permission denied | Grant Calendar/Reminders access in System Settings > Privacy & Security |
| Permission dialog never appears | See Grant Permissions for macOS Sequoia workaround |
| Permission denied over SSH | See SSH Access below |
| Permission denied under launchd | See launchd / Automation below |
| Calendar not found | Ensure the calendar is visible in macOS Calendar app |
| Reminders not syncing | Check iCloud sync in System Settings |
macOS TCC (Transparency, Consent, and Control) grants privacy permissions per-application. SSH sessions run under sshd, which is a different security context — so permissions granted to Terminal or Claude Code locally do not carry over to SSH.
Workaround A — Run locally first (recommended):
CheICalMCP once on the target Mac locally (not over SSH)CheICalMCP binaryWorkaround B — Grant Full Disk Access to sshd:
/usr/sbin/sshd, and add it⚠️ Workaround B grants
sshdbroad file access — only use this on machines you fully control.
When running CheICalMCP from launchd, cron, or other non-interactive automation, macOS TCC cannot show permission dialogs. Use --setup to pre-grant permissions:
# Step 1: Run once from Terminal (triggers TCC permission dialog)
CheICalMCP --setup
# Step 2: Grant Calendar & Reminders access in the dialog that appears
# Step 3: The binary now has permission — launchd jobs can use it
Detection: CheICalMCP automatically detects non-interactive sessions (missing
TERMenv var or direct launchd child) and provides targeted error messages with--setupinstructions. This works even for indirect launch chains (launchd → Claude Code → CheICalMCP).Note: If
--setupgrants permission but the MCP still fails under launchd, TCC may have associated the permission with the parent process. In that case, manually add CheICalMCP in System Settings → Privacy & Security → Calendar/Reminders.
| Version | Changes |
|---|---|
| v1.7.1 | Security hardening (#20 #26): input validation (length limits + URL scheme allowlist) at all event/reminder entry points, prompt-injection wrapper on MCP read responses, parse-boundary validation for days_of_week / days_of_month / alarms_minutes_offsets (throws instead of silent-dropping invalid values), Info.plist catch-up, 42 new regression tests. |
| v1.7.0 | Attendee & organizer info (#17): read-only attendees array and organizer object in event responses. Refactored shared formatEventDict method. |
| v1.6.0 | --setup flag (#13): pre-authorize TCC permissions for launchd/automation. Non-interactive session detection (TERM + ppid). Combined SSH+launchd error messages. --cli mode (#14): invoke all 28 tools directly from command line without MCP server. Flag-based (--key value) and JSON stdin modes. Smart type inference for bool/int/double/array params. MCP Swift SDK 0.12.0 (Swift 6.3 compat). |
| v1.5.0 | Per-event timezone (#12): timezone parameter on create_event/update_event/create_events_batch, event output uses event's own timezone, naive datetimes parsed in event timezone. Clear due date (#9): clear_due_date on update_reminder. Weekday validation (#5): create_event/update_event validate start_time weekday against days_of_week. Undo/redo (#8): 3 new tools (undo, redo, undo_history). Recurring event fixes (#7): occurrence-level delete/update with occurrence_date. Swift 6 build (#11): README updated for make release workflow |
| v1.4.0 | LLM reliability: Fix default search range (±2yr instead of distantPast/Future), searched_range metadata in search_events response, similar_events hints in create_events_batch, LLM tips in tool descriptions |
| v1.3.1 | Docs fix: Clarified that tags are MCP-level (not native Reminders.app tags); Apple provides no public API for native tags |
| v1.3.0 | Reminder tags (MCP-level): #hashtag text stored in notes for create_reminder/update_reminder/create_reminders_batch, tag-based filtering in search_reminders, new list_reminder_tags tool; MCP SDK 0.11.0. Note: tags are searchable via MCP but do not appear as native Reminders.app tags (Apple provides no public API for this) |
| v1.2.0 | Idempotent writes: create_event, create_events_batch, create_reminder, create_reminders_batch, create_calendar now check-before-write to prevent duplicates on retry; responses include skipped count |
| v1.1.0 | Recurrence + Location: recurring events/reminders (daily/weekly/monthly/yearly), structured locations with coordinates, location-based reminder triggers (geofence enter/leave), rich recurrence output |
| v1.0.0 | DX improvements: flexible date parsing (4 formats), fuzzy calendar matching, list_events/list_reminders filter/sort/limit, delete_events_batch dry-run + date range mode |
| v0.9.0 | 4 new tools (20→24): update_calendar, search_reminders, create_reminders_batch, delete_reminders_batch |
| v0.8.2 | i18n week support: week_starts_on parameter for list_events_quick (monday/sunday/saturday/system) |
| v0.8.1 | Fix: update_event time validation bug, duration preservation when moving events |
| v0.8.0 | BREAKING: calendar_name now required for create operations (no more implicit defaults) |
| v0.7.0 | Tool annotations for Anthropic Connectors Directory, auto-refresh mechanism, improved batch tool descriptions |
| v0.6.0 | Source disambiguation: calendar_source parameter for same-name calendars |
| v0.5.0 | Batch delete, duplicate detection, multi-keyword search, improved permission errors, PRIVACY.md |
| v0.4.0 | Copy/move events: copy_event, move_events_batch |
| v0.3.0 | Advanced features: search, quick range, batch create, conflict check, timezone display |
| v0.2.0 | Swift rewrite with full Reminders support |
| v0.1.x | Python version (deprecated) |
Contributions are welcome! Please feel free to submit a Pull Request.
Version numbers live in three places with different semantics:
| File | Role | When to bump |
|---|---|---|
Sources/CheICalMCP/Version.swift — AppVersion.current |
Source of truth; appears in --version, help, and MCP serverInfo.version |
Every release |
Sources/CheICalMCP/Info.plist — CFBundleVersion |
macOS bundle version | Every release; must match AppVersion.current |
mcpb/manifest.json — version |
Claude Desktop bundle manifest shipped inside .mcpb |
Every release; must match AppVersion.current |
server.json — version + packages[].identifier + fileSha256 |
MCP Registry submission snapshot | Only when re-submitting a new .mcpb to the MCP Registry (independent cadence) |
scripts/build-mcpb.sh enforces the first three match; it will fail the build if any drifts. server.json is intentionally decoupled because bumping it requires a rebuilt .mcpb, a fresh SHA256, and a re-submission — steps that don't happen every source release.
MIT License - see LICENSE for details.
Created by Che Cheng (@kiki830621)
If you find this useful, please consider giving it a star!
Добавь это в claude_desktop_config.json и перезапусти Claude Desktop.
{
"mcpServers": {
"che-ical-mcp": {
"command": "npx",
"args": []
}
}
}Read and write pages in your workspace
Issues, cycles, triage — from Claude
Search and read your Drive files
Connect and unify data across various platforms and databases with [MindsDB as a single MCP server](https://docs.mindsdb.com/mcp/overview).