Calendar Management Skill

Manage Lark calendar via the lark CLI.

Running Commands

Ensure lark is in your PATH, or use the full path to the binary. Set the config directory if not using the default:

lark cal <command>
# Or with explicit config:
LARK_CONFIG_DIR=/path/to/.lark lark cal <command>

Before Running Commands

Always check the current time first before running calendar commands that involve dates or times:

date '+%Y-%m-%d %H:%M:%S %Z'

This ensures you use the correct current date when constructing queries like --from, --to, --start, etc.

Commands Reference

Check Authentication

lark auth status

List Events

# Today's events with your RSVP status (recommended default)
lark cal list --rsvp

# This week with RSVP status
lark cal list --week --rsvp

# Date range (ISO 8601)
lark cal list --from 2024-01-15 --to 2024-01-20 --rsvp

# With conflict detection
lark cal list --week --detect-conflicts --buffer-minutes 15 --rsvp

# Events awaiting RSVP
lark cal list --pending --from 2024-01-15 --to 2024-01-31

# Include all attendee info (slower)
lark cal list --week --attendees

Important: Always include --rsvp when listing events to show the user's RSVP status. Highlight events where rsvp_status is needs_action.

Show Event Details

lark cal show <event-id>

Create Event

lark cal create \
  --summary "Meeting title" \
  --start 2024-01-20T14:00:00+08:00 \
  --duration 1h \
  --location "Conference Room A" \
  --description "Discussion topics" \
  --attendee user1@example.com \
  --attendee user2@example.com \
  --reminder 15 \
  --color "#9CA2A9" \
  --visibility private

Time format: ISO 8601 (e.g., 2024-01-20T14:00:00+08:00 or 2024-01-20) Duration formats: 30m, 1h, 1h30m Color format: Hex (e.g., #9CA2A9) Visibility: default, public, or private Attendee ability (guest permissions): none, can_see_others, can_invite_others, or can_modify_event

Additional flags:

• --exclude-self - Don't add yourself as an attendee
• --attendee-ability - Set guest permissions (see values above)

Update Event

lark cal update <event-id> \
  --summary "New title" \
  --start 2024-01-20T15:00:00+08:00 \
  --end 2024-01-20T16:00:00+08:00 \
  --color "#34C724"

# Change visibility
lark cal update <event-id> --visibility public

Available flags: --summary, --description, --start, --end, --location, --color, --visibility, --attendee-ability, --no-notify

Visibility options: default, public, or private

Note: Use --start and --end together to reschedule. There is no --duration flag.

Delete Event

lark cal delete <event-id>

Search Events

lark cal search "keyword" --from 2024-01-08 --to 2024-01-22

Look Up User

# Get user's open_id from email (needed for freebusy/common-freetime)
lark cal lookup-user --email user@example.com

Check Availability

# Own availability
lark cal freebusy --from 2024-01-20T09:00:00+08:00 --to 2024-01-20T18:00:00+08:00

# Another user's availability
lark cal freebusy --from 2024-01-20T09:00:00+08:00 --to 2024-01-20T18:00:00+08:00 --user <open_id>

# Meeting room availability
lark cal freebusy --from 2024-01-20T09:00:00+08:00 --to 2024-01-20T18:00:00+08:00 --room <room_id>

Find Common Free Time

# Find mutual availability with one or more users
lark cal common-freetime \
  --users ou_abc123 \
  --from 2024-01-20T09:00:00+08:00 \
  --to 2024-01-20T18:00:00+08:00 \
  --min-length 30

# Multiple users (comma-separated, max 10)
lark cal common-freetime \
  --users "ou_abc123,ou_def456" \
  --from 2024-01-20 \
  --to 2024-01-21 \
  --work-hours

Available flags: --users (required), --from, --to, --min-length, --work-hours, --include-external, --limit

RSVP to Event

# Accept an invitation
lark cal rsvp <event-id> --accept

# Decline an invitation
lark cal rsvp <event-id> --decline

# Mark as tentative
lark cal rsvp <event-id> --tentative

Manage Attendees

# Add yourself to an event
lark cal attendee add <event-id> --self

# Add someone by email (adds as third-party/external)
lark cal attendee add <event-id> --email user@example.com

# Add someone by Lark user ID (preferred - shows as proper Lark user)
lark cal attendee add <event-id> --user ou_xxxxxxxx

# Add as optional attendee
lark cal attendee add <event-id> --user ou_xxxxxxxx --optional

# Add without sending notification
lark cal attendee add <event-id> --self --no-notify

# List attendees (shows attendee IDs needed for removal)
lark cal attendee list <event-id>

# Remove yourself from an event
lark cal attendee remove <event-id> --self

# Remove by attendee ID (get ID from attendee list)
lark cal attendee remove <event-id> --id user_xxxxx

Tip: Just use email addresses with --attendee (create) or --email (attendee add). The CLI automatically resolves internal Lark users via the contacts API, falling back to third-party for external contacts.

Output Formats

• Default: JSON (for programmatic processing)
• Note: All commands output JSON. Format the output appropriately when presenting to user.

Error Handling

Errors return JSON:

{
  "error": true,
  "code": "ERROR_CODE",
  "message": "Description"
}

Common error codes:

• AUTH_ERROR - Need to run lark auth login
• SCOPE_ERROR - Missing calendar permissions. Run lark auth login --add --scopes calendar
• EVENT_NOT_FOUND - Invalid event ID
• VALIDATION_ERROR - Missing required fields
• API_ERROR - Lark API issue

Required Permissions

This skill requires the calendar scope group. If you see a SCOPE_ERROR, the user needs to add calendar permissions:

lark auth login --add --scopes calendar

To check current permissions:

lark auth status

EA Best Practices

When managing the user's calendar, follow these guidelines:

Before Scheduling

• Always check for conflicts using --detect-conflicts before creating events
• Check attendee availability with freebusy before inviting others
• For in-person meetings, consider travel/commute time

Buffer Time

• Maintain 15 minutes buffer between meetings by default
• Flag back-to-back meetings as a concern when showing schedule
• Suggest rescheduling if no buffer exists

Schedule Health

• Flag overloaded days: More than 6 hours of meetings in a day is a concern
• Proactively suggest declining or rescheduling when schedule is packed
• Protect focus time - prefer scheduling meetings in afternoons when possible

Finding Meeting Slots

• When asked to "find time", use freebusy to check availability
• Prefer morning slots for focus work, afternoon for meetings (unless user has different preference in profile)
• Account for timezone differences when scheduling with external attendees

Rescheduling Meetings

• Always check all attendees first - Use cal show <event-id> to get the full attendee list before checking availability. Don't assume you know who's invited.
• Watch for bogus busy blocks - Freebusy data can contain erroneous all-day or multi-day blocks that aren't real OOO. If common-freetime returns no slots unexpectedly, check individual freebusy data to spot anomalies.

Communication

• When showing the day's schedule, summarize key meetings and highlight any concerns
• After creating/updating events, confirm the details back to the user
• If authentication fails, remind user to run lark auth login