gzlicanyi CalDAV Sync Tool
Manage calendar events and todos via CalDAV protocol. Supports Google Calendar, iCloud, Nextcloud, Fastmail, NetEase (163/126/yeah.net), and any standard CalDAV server.
Configuration
Run the setup script to install dependencies and configure your CalDAV account:
bash setup.sh
If running commands manually without setup.sh, install dependencies first:
npm install --production
Configuration is stored at ~/.config/mail-skills/.env (shared with imap-smtp-email skill). If no shared config is found, the skill falls back to a .env file in the skill directory.
Config file format
# Default account
PROVIDER=163
USERNAME=your@163.com
PASSWORD=your_password
CALDAV_DEFAULT_CALENDAR=
The PROVIDER preset auto-fills the CalDAV server URL. For custom servers:
PROVIDER=custom
USERNAME=your@email.com
PASSWORD=your_password
CALDAV_SERVER_URL=https://your-caldav-server.com/
Multi-Account
You can configure additional accounts in the same config file. Each account uses a name prefix (uppercase) on all variables.
# Work account (WORK_ prefix)
WORK_PROVIDER=gmail
WORK_USERNAME=me@company.com
WORK_PASSWORD=app_password
WORK_CALDAV_DEFAULT_CALENDAR=work
Add --account <name> before the command:
node scripts/caldav.js --account work list-calendars
node scripts/caldav.js --account work list-events --start 2026-01-01 --end 2026-12-31
Supported Providers
| Provider | Server URL | Auth |
|---|---|---|
| Google Calendar | https://calendar.google.com/calendar/dav/ |
App Password |
| iCloud | https://caldav.icloud.com/ |
App-Specific Password |
| Nextcloud | https://<host>/remote.php/dav/calendars/<user>/ |
Username/Password |
| Fastmail | https://caldav.fastmail.com/dav/ |
Username/Password |
| NetEase (163/126/yeah.net) | https://caldav.163.com/ |
Authorization Code |
| NetEase Enterprise (North) | https://caldav.qiye.163.com/ |
Username/Password |
| NetEase Enterprise (East) | https://caldavhz.qiye.163.com/ |
Username/Password |
Commands
list-calendars
List all available calendars.
node scripts/caldav.js [--account <name>] list-calendars
list-events
Query events in a time range.
node scripts/caldav.js [--account <name>] list-events --start <date> --end <date> [--calendar <id>] [--force-refresh]
get-event
Get a specific event by UID.
node scripts/caldav.js [--account <name>] get-event --uid <uid> [--calendar <id>]
create-event
Create a new calendar event.
node scripts/caldav.js [--account <name>] create-event --summary <text> --start <datetime> --end <datetime> \
[--description <text>] [--location <text>] [--calendar <id>]
update-event
Update an existing event.
node scripts/caldav.js [--account <name>] update-event --uid <uid> [--summary <text>] [--start <datetime>] \
[--end <datetime>] [--description <text>] [--location <text>] [--calendar <id>]
delete-event
Delete an event.
node scripts/caldav.js [--account <name>] delete-event --uid <uid> [--calendar <id>]
list-todos
List all todos/tasks.
node scripts/caldav.js [--account <name>] list-todos [--status <all|pending|completed>] [--calendar <id>] [--force-refresh]
create-todo
Create a new todo/task.
node scripts/caldav.js [--account <name>] create-todo --summary <text> [--due <date>] \
[--description <text>] [--priority <1-9>] [--calendar <id>]
update-todo
Update an existing todo.
node scripts/caldav.js [--account <name>] update-todo --uid <uid> [--summary <text>] [--due <date>] \
[--status <pending|completed>] [--calendar <id>]
delete-todo
Delete a todo.
node scripts/caldav.js [--account <name>] delete-todo --uid <uid> [--calendar <id>]
freebusy
Query free/busy information for a time range.
node scripts/caldav.js [--account <name>] freebusy --start <datetime> --end <datetime> [--calendar <id>]
list-accounts
List all configured CalDAV accounts.
node scripts/caldav.js list-accounts
Incremental Sync
list-events and list-todos automatically use incremental sync when available:
- sync-token — only fetches changed resources (preferred)
- ctag + etag — compares calendar tag and resource tags to fetch only changes
- full — fetches all resources (fallback)
Sync state is cached at ~/.config/mail-skills/caldav-cache/ per account and calendar. Write operations (create/update/delete) automatically invalidate the cache.
Use --force-refresh to bypass the cache and force a full sync:
node scripts/caldav.js list-events --start 2026-01-01 --end 2026-12-31 --force-refresh
node scripts/caldav.js list-todos --force-refresh
Security Notes
- Configuration is stored at
~/.config/mail-skills/.envwith600permissions (owner read/write only) - For Google: regular password is rejected -- generate an App Password at https://myaccount.google.com/apppasswords
- For NetEase: use authorization code (授权码), not account password
Troubleshooting
Connection failed:
- Verify server URL is correct and accessible
- Check username and password
Authentication failed:
- For Google: use App Password, not regular password
- For NetEase: use authorization code, not account password
- For iCloud: use App-Specific Password
No calendars found:
- Verify CalDAV service is enabled in your account settings
- Check the server URL includes the correct path
Related Skills
- imap-smtp-email - Read, search, manage, and send emails via IMAP/SMTP. Supports Gmail, Outlook, NetEase (163/126/188), and any standard IMAP/SMTP server. Install with:
npx skills add https://github.com/gzlicanyi/mail-skills -s imap-smtp-email
Feedback
Issues and pull requests are welcome at github.com/gzlicanyi/mail-skills.