Caldav Calendar 1.0.1

Sync and query CalDAV calendars (iCloud, Google, Fastmail, Nextcloud, etc.) using vdirsyncer + khal. Works on Linux.

Security Scan

The skill's instructions, required binaries, and file paths match its stated purpose of using vdirsyncer + khal to sync/query CalDAV calendars; nothing in the package indicates covert or unrelated behavior.

Purpose & Capability

Name and description match the runtime instructions and required binaries: the SKILL.md explicitly uses vdirsyncer and khal and the registry metadata lists those binaries. There are no unrelated credentials, binaries, or install steps requested that would be unexpected for a CalDAV sync/query utility.

Instruction Scope

Instructions are scoped to configuring vdirsyncer and khal, syncing, listing, searching, creating, editing, and deleting calendar events. They reference user-config files (~/.config/vdirsyncer/config, ~/.config/khal/config), a password file (~/.config/vdirsyncer/icloud_password), and a cache file (~/.local/share/khal/khal.db). Touching those user files is expected for this functionality, but the SKILL.md does instruct actions that read and delete local files (e.g., cat a password file, rm khal.db) — these are necessary for operation but are sensitive and worth user review.

Install Mechanism

This is an instruction-only skill with no install spec and no code files. That minimizes installer risk; the provided apt install suggestion in metadata is reasonable and points at distro packages rather than arbitrary downloads.

Credentials

The skill declares no required environment variables or primary credential, which is consistent with an instruction-only guide. However the instructions require the user to supply credentials for CalDAV providers (via config files or a local password file). The skill does not request or manage secrets itself — it asks users to store credentials on disk (or configure vdirsyncer to fetch them). Users should note that storing plaintext passwords in files is a local security decision.

Persistence & Privilege

The skill does not request always: true, does not install background services, and does not modify other skills or system-wide agent settings. It is user-invocable only and will operate on local user config/data when invoked.

Assessment

This skill is a usage guide for vdirsyncer + khal and appears coherent with that purpose. Before installing/using it: 1) Ensure you install vdirsyncer and khal from trusted package sources (your distro) rather than random binaries. 2) Review and create the vdirsyncer and khal config files yourself — the SKILL.md shows example contents and file locations. 3) Be cautious about how you store calendar passwords: the examples use a local file (plaintext) and a command-based fetch; prefer secure storage (keyring, OS password store, or provider-specific OAuth/app passwords) where possible. 4) Note the skill may instruct you to remove the khal cache file if data seems stale—this will delete local cached calendar data. 5) Because the skill will access your calendar servers, use least-privilege credentials (app-specific passwords) and verify provider URLs. If you are comfortable managing these local config files and secrets, the skill is consistent with its stated purpose.

CalDAV Calendar (vdirsyncer + khal)

vdirsyncer syncs CalDAV calendars to local .ics files. khal reads and writes them.

Sync First

Always sync before querying or after making changes:

vdirsyncer sync

View Events

khal list                        # Today
khal list today 7d               # Next 7 days
khal list tomorrow               # Tomorrow
khal list 2026-01-15 2026-01-20  # Date range
khal list -a Work today          # Specific calendar

Search

khal search "meeting"
khal search "dentist" --format "{start-date} {title}"

Create Events

khal new 2026-01-15 10:00 11:00 "Meeting title"
khal new 2026-01-15 "All day event"
khal new tomorrow 14:00 15:30 "Call" -a Work
khal new 2026-01-15 10:00 11:00 "With notes" :: Description goes here

After creating, sync to push changes:

vdirsyncer sync

Edit Events (interactive)

khal edit is interactive — requires a TTY. Use tmux if automating:

khal edit "search term"
khal edit -a CalendarName "search term"
khal edit --show-past "old event"

Menu options:

• s → edit summary
• d → edit description
• t → edit datetime range
• l → edit location
• D → delete event
• n → skip (save changes, next match)
• q → quit

After editing, sync:

vdirsyncer sync

Delete Events

Use khal edit, then press D to delete.

Output Formats

For scripting:

khal list --format "{start-date} {start-time}-{end-time} {title}" today 7d
khal list --format "{uid} | {title} | {calendar}" today

Placeholders: {title}, {description}, {start}, {end}, {start-date}, {start-time}, {end-date}, {end-time}, {location}, {calendar}, {uid}

Caching

khal caches events in ~/.local/share/khal/khal.db. If data looks stale after syncing:

rm ~/.local/share/khal/khal.db

Initial Setup

1. Configure vdirsyncer (~/.config/vdirsyncer/config)

Example for iCloud:

[general]
status_path = "~/.local/share/vdirsyncer/status/"

[pair icloud_calendar]
a = "icloud_remote"
b = "icloud_local"
collections = ["from a", "from b"]
conflict_resolution = "a wins"

[storage icloud_remote]
type = "caldav"
url = "https://caldav.icloud.com/"
username = "[e-mail]"
password.fetch = ["command", "cat", "~/.config/vdirsyncer/icloud_password"]

[storage icloud_local]
type = "filesystem"
path = "~/.local/share/vdirsyncer/calendars/"
fileext = ".ics"

Provider URLs:

• iCloud: https://caldav.icloud.com/
• Google: Use google_calendar storage type
• Fastmail: https://caldav.fastmail.com/dav/calendars/user/EMAIL/
• Nextcloud: https://YOUR.CLOUD/remote.php/dav/calendars/USERNAME/

2. Configure khal (~/.config/khal/config)

[calendars]
[[my_calendars]]
path = ~/.local/share/vdirsyncer/calendars/*
type = discover

[default]
default_calendar = Home
highlight_event_days = True

[locale]
timeformat = %H:%M
dateformat = %Y-%m-%d

3. Discover and sync

vdirsyncer discover   # First time only
vdirsyncer sync