youlu-openclaw-workspace/skills/calendar/SKILL.md

name, description, metadata

name	description	metadata
calendar	Calendar invites and VTODO task management via CalDAV. Send/reply to invites, create/list/complete/delete todos. Syncs to Migadu CalDAV via vdirsyncer.	clawdbot emoji requires 📅 bins skills himalaya vdirsyncer todo himalaya

Calendar

Send, accept, and decline calendar invitations via email. Create and manage VTODO tasks with CalDAV sync. Events and tasks sync to Migadu CalDAV via vdirsyncer.

Testing

See TESTING.md for dry-run and live test steps, verification checklists, and troubleshooting.

Prerequisites

• himalaya configured and working (see the himalaya skill)
• vdirsyncer configured and syncing to ~/.openclaw/workspace/calendars/
• todoman (todo) for VTODO management (list, complete, delete)
• khal for reading calendar (optional but recommended)
• Runs via uv run (dependencies managed in pyproject.toml)

Important: Email Sending Rules

Calendar invites are outbound emails. Follow the workspace email rules:

• youlu@luyanxin.com -> mail@luyx.org: send directly, no confirmation needed
• All other recipients: confirm with user before sending

Usage

All commands go through the wrapper script:

SKILL_DIR=~/.openclaw/workspace/skills/calendar

# Send an invite (supports recurring events via --rrule)
$SKILL_DIR/scripts/calendar.sh send [options]

# Reply to an invite
$SKILL_DIR/scripts/calendar.sh reply [options]

# Manage events
$SKILL_DIR/scripts/calendar.sh event list [options]
$SKILL_DIR/scripts/calendar.sh event delete [options]

# Manage todos
$SKILL_DIR/scripts/calendar.sh todo add [options]
$SKILL_DIR/scripts/calendar.sh todo list [options]
$SKILL_DIR/scripts/calendar.sh todo edit [options]
$SKILL_DIR/scripts/calendar.sh todo complete [options]
$SKILL_DIR/scripts/calendar.sh todo delete [options]
$SKILL_DIR/scripts/calendar.sh todo check

---

Sending Invites

$SKILL_DIR/scripts/calendar.sh send \
  --to "friend@example.com" \
  --subject "Lunch on Friday" \
  --summary "Lunch at Tartine" \
  --start "2026-03-20T12:00:00" \
  --end "2026-03-20T13:00:00" \
  --location "Tartine Bakery, SF" \
  --alarm 1h

Send Options

Flag	Required	Description
--to	Yes	Recipient(s), comma-separated
--subject	Yes	Email subject line
--summary	Yes	Event title (shown on calendar)
--start	Yes	Start time, ISO 8601 (2026-03-20T14:00:00)
--end	Yes	End time, ISO 8601 (2026-03-20T15:00:00)
--from	No	Sender email (default: youlu@luyanxin.com)
--timezone	No	IANA timezone (default: America/Los_Angeles)
--location	No	Event location
--description	No	Event description / notes
--organizer	No	Organizer display name (defaults to --from)
--rrule	No	Recurrence rule (e.g. FREQ=WEEKLY;COUNT=13;BYDAY=TU)
--uid	No	Custom event UID (auto-generated if omitted)
--alarm	No	Reminder trigger: 1d, 2h, 30m (default: 1d)
--account	No	Himalaya account name (if not default)
--dry-run	No	Print ICS + MIME without sending

Send Examples

# Simple invite (--from and --timezone default to youlu@luyanxin.com / LA)
$SKILL_DIR/scripts/calendar.sh send \
  --to "alice@example.com" \
  --subject "Coffee Chat" \
  --summary "Coffee Chat" \
  --start "2026-03-25T10:00:00" \
  --end "2026-03-25T10:30:00"

# Multiple attendees with details
$SKILL_DIR/scripts/calendar.sh send \
  --to "alice@example.com, bob@example.com" \
  --subject "Team Sync" \
  --summary "Weekly Team Sync" \
  --start "2026-03-23T09:00:00" \
  --end "2026-03-23T09:30:00" \
  --location "Zoom - https://zoom.us/j/123456" \
  --description "Weekly check-in. Agenda: updates, blockers, action items."

# Recurring: every Tuesday for 13 weeks (--start MUST fall on a Tuesday)
$SKILL_DIR/scripts/calendar.sh send \
  --to "alice@example.com" \
  --subject "Allergy Shot (Tue)" \
  --summary "Allergy Shot (Tue)" \
  --start "2026-03-31T14:30:00" \
  --end "2026-03-31T15:00:00" \
  --location "11965 Venice Blvd. #300, LA" \
  --rrule "FREQ=WEEKLY;COUNT=13;BYDAY=TU"

# Dry run (always use for recurring events to verify)
$SKILL_DIR/scripts/calendar.sh send \
  --to "test@example.com" \
  --subject "Test" \
  --summary "Test Event" \
  --start "2026-04-01T15:00:00" \
  --end "2026-04-01T16:00:00" \
  --dry-run

Recurring Events (--rrule)

The --rrule flag accepts an RFC 5545 RRULE string. Common patterns:

Pattern	RRULE
Weekly on Tue, 13 weeks	FREQ=WEEKLY;COUNT=13;BYDAY=TU
Weekly on Mon/Wed/Fri, until date	FREQ=WEEKLY;UNTIL=20260630T000000Z;BYDAY=MO,WE,FR
Every 2 weeks on Thu	FREQ=WEEKLY;INTERVAL=2;BYDAY=TH
Monthly on the 15th, 6 times	FREQ=MONTHLY;COUNT=6;BYMONTHDAY=15
Daily for 5 days	FREQ=DAILY;COUNT=5

Critical rule: For FREQ=WEEKLY with a single BYDAY, the --start date must fall on that day of the week. The tool validates this and will reject mismatches. RFC 5545 says mismatched DTSTART/BYDAY produces undefined behavior.

Best practice: Always --dry-run first for recurring events to verify the generated ICS.

---

Managing Events

# List upcoming events (next 90 days)
$SKILL_DIR/scripts/calendar.sh event list

# Search events by text
$SKILL_DIR/scripts/calendar.sh event list --search "Allergy"

# List with UIDs (for deletion)
$SKILL_DIR/scripts/calendar.sh event list --format "{uid} {title}"

# Custom date range
$SKILL_DIR/scripts/calendar.sh event list --range-start "2026-04-01" --range-end "2026-04-30"

# Delete a single (non-recurring) event
$SKILL_DIR/scripts/calendar.sh event delete --match "Lunch at Tartine"

# Cancel ONE occurrence of a recurring event (adds EXDATE, keeps the series)
$SKILL_DIR/scripts/calendar.sh event delete --match "Allergy Shot" --date "2026-03-28"

# Delete an entire recurring series (requires --all safety flag)
$SKILL_DIR/scripts/calendar.sh event delete --match "Allergy Shot" --all

Event Delete Safety

• Deletes only ONE event at a time. If multiple events match, it lists them and exits.
• Recurring events require --date or --all. Without either flag, the tool refuses to act and shows usage.
  • --date YYYY-MM-DD: Adds an EXDATE to skip that one occurrence. The rest of the series continues.
  • --all: Deletes the entire .ics file (the whole series). Use only when the user explicitly wants to cancel all future occurrences.
• NEVER use rm on calendar .ics files directly. Always use event delete.
• After deleting/cancelling, verify with event list or khal list.

---

Replying to Invites

# Accept by himalaya envelope ID
$SKILL_DIR/scripts/calendar.sh reply \
  --envelope-id 42 \
  --action accept

# Decline with a comment
$SKILL_DIR/scripts/calendar.sh reply \
  --envelope-id 42 \
  --action decline \
  --comment "Sorry, I have a conflict."

# From an .ics file
$SKILL_DIR/scripts/calendar.sh reply \
  --ics-file ~/Downloads/meeting.ics \
  --action tentative

Reply Options

Flag	Required	Description
--action	Yes	accept, decline, or tentative
--envelope-id	*	Himalaya envelope ID containing the .ics attachment
--ics-file	*	Path to an .ics file (alternative to --envelope-id)
--from	No	Your email (default: youlu@luyanxin.com)
--account	No	Himalaya account name
--folder	No	Himalaya folder (default: INBOX)
--comment	No	Optional message to include in reply
--dry-run	No	Preview without sending

* One of --envelope-id or --ics-file is required.

Typical Workflow

1. List emails: himalaya envelope list
2. Read the invite: himalaya message read 57
3. Reply: $SKILL_DIR/scripts/calendar.sh reply --envelope-id 57 --action accept

---

VTODO Tasks

Manage tasks as RFC 5545 VTODO components, stored in ~/.openclaw/workspace/calendars/tasks/ and synced to CalDAV.

Sync Model

The agent's local CalDAV is the source of truth. When a todo is created, it's saved locally and synced to Migadu CalDAV via vdirsyncer — all connected devices (DAVx5, etc.) pick it up automatically. When the user completes a task, they tell the agent, and the agent runs todo complete. The daily todo check cron reads from local files.

Priority Mapping (RFC 5545)

Label	--priority	RFC 5545 value
高 (high)	high	1
中 (medium)	medium	5 (default)
低 (low)	low	9

todo add — Create a Todo

$SKILL_DIR/scripts/calendar.sh todo add \
  --summary "跟进iui保险报销" \
  --due "2026-03-25" \
  --priority high \
  --description "确认iui费用保险报销进度" \
  --alarm 1d

Flag	Required	Description
--summary	Yes	Todo title
--due	No	Due date, YYYY-MM-DD (default: tomorrow)
--priority	No	high, medium, or low (default: medium)
--description	No	Notes / description
--alarm	No	Reminder trigger: 1d, 2h, 30m (default: 1d)
--dry-run	No	Preview ICS without saving

todo list — List Todos

$SKILL_DIR/scripts/calendar.sh todo list           # pending only
$SKILL_DIR/scripts/calendar.sh todo list --all      # include completed

todo edit — Modify a Todo

$SKILL_DIR/scripts/calendar.sh todo edit --match "保险报销" --due "2026-03-26"
$SKILL_DIR/scripts/calendar.sh todo edit --uid "abc123@openclaw" --priority high
$SKILL_DIR/scripts/calendar.sh todo edit --match "census" --due "2026-03-28" --priority low

Flag	Required	Description
--uid	*	Todo UID
--match	*	Match on summary text
--due	No	New due date (YYYY-MM-DD)
--priority	No	New priority: high, medium, or low

* One of --uid or --match is required. At least one edit flag must be provided.

todo complete — Mark as Done

$SKILL_DIR/scripts/calendar.sh todo complete --uid "abc123@openclaw"
$SKILL_DIR/scripts/calendar.sh todo complete --match "保险报销"

todo delete — Remove a Todo

$SKILL_DIR/scripts/calendar.sh todo delete --uid "abc123@openclaw"
$SKILL_DIR/scripts/calendar.sh todo delete --match "保险报销"

todo check — Daily Digest (Cron)

$SKILL_DIR/scripts/calendar.sh todo check

Same as todo list but only pending items. Exits silently when nothing is pending.

---

How It Works

Sending invites:

1. Generates an RFC 5545 ICS file with METHOD:REQUEST (via icalendar library)
2. Builds a MIME email with a text/calendar attachment (via Python email.mime)
3. Sends via himalaya message send (piped through stdin)
4. Saves the event to ~/.openclaw/workspace/calendars/home/
5. Runs vdirsyncer sync to push to Migadu CalDAV

Replying to invites:

1. Extracts the .ics attachment from the email (via himalaya attachment download)
2. Parses the original event with the icalendar library
3. Generates a reply ICS with METHOD:REPLY and the correct PARTSTAT
4. Sends the reply to the organizer via himalaya message send (stdin)
5. On accept/tentative: saves event to local calendar. On decline: removes it
6. Runs vdirsyncer sync to push changes to Migadu CalDAV

Managing todos:

1. todo add: Creates a VTODO ICS file (via icalendar library), saves to calendars/tasks/, syncs to CalDAV
2. todo list/complete/delete/check: Delegates to todoman CLI for robust RFC 5545 VTODO parsing
3. Runs vdirsyncer sync after mutations to push changes to Migadu CalDAV

CalDAV sync:

• Events and tasks sync to Migadu and appear on all connected devices (DAVx5, etc.)
• Heartbeat runs vdirsyncer sync periodically as a fallback
• If sync fails, it warns but doesn't block — next heartbeat catches up

Integration with Email Processor

The email processor (scripts/email_processor/) may classify incoming calendar invites as reminder or confirmation. When reviewing pending emails:

1. Check if the email contains a calendar invite (look for .ics attachment or "calendar" in subject)
2. If it does, use reply instead of the email processor's delete/archive/keep actions
3. The email processor handles the email lifecycle; this skill handles the calendar response

Checking the Calendar

# List upcoming events (next 7 days)
khal list today 7d

# List events for a specific date
khal list 2026-03-25

# Check for conflicts before sending an invite
khal list 2026-03-25 2026-03-26

Timezone Reference

Common IANA timezones:

• America/Los_Angeles — Pacific (default)
• America/Denver — Mountain
• America/Chicago — Central
• America/New_York — Eastern
• Asia/Shanghai — China
• Asia/Tokyo — Japan
• Europe/London — UK
• UTC — Coordinated Universal Time

Troubleshooting

Invite shows as attachment instead of calendar event?

• Ensure the MIME part has Content-Type: text/calendar; method=REQUEST
• Some clients require the METHOD:REQUEST line in the ICS body

Times are wrong?

• Double-check --timezone matches the intended timezone
• Use ISO 8601 format: YYYY-MM-DDTHH:MM:SS (no timezone offset in the value)

Event not showing on phone/other devices?

• Run vdirsyncer sync manually to force sync
• Check ~/.openclaw/workspace/logs/vdirsyncer.log for errors
• Verify the .ics file exists in ~/.openclaw/workspace/calendars/home/

Todos not syncing?

• Check that ~/.openclaw/workspace/calendars/tasks/ exists
• Verify vdirsyncer has a cal/tasks pair configured
• Run vdirsyncer sync manually

Recipient doesn't see Accept/Decline?

• Gmail, Outlook, Apple Mail all support text/calendar method=REQUEST
• Some webmail clients may vary