Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add marcusquinn/aidevops --skill caldav-calendargit clone --depth 1 https://github.com/marcusquinn/aidevopsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/marcusquinn/aidevops/caldav-calendar)<a href="https://agentmods.dev/skills/marcusquinn/aidevops/caldav-calendar"><img src="https://agentmods.dev/badge/skills/marcusquinn/aidevops/caldav-calendar/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/marcusquinn/aidevops/caldav-calendar"><img src="https://agentmods.dev/badge/skills/marcusquinn/aidevops/caldav-calendar.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00031 | $0.00490 |
| Opus 5.5 | $0.00012 | $0.00196 |
| Sonnet 5.5 | $0.00006 | $0.00098 |
| Haiku 4.5 | $0.00003 | $0.00049 |
Grade A, and why
caldav-calendar scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
CalDAV Calendar (vdirsyncer + khal)
For reminders/tasks (not events): see tools/productivity/apple-reminders.md.
Sync first — always sync before querying or after changes: vdirsyncer sync
Initial Setup
- Configure vdirsyncer (
~/.config/vdirsyncer/config) — supports iCloud, Google, Fastmail, Nextcloud - Configure khal (
~/.config/khal/config) - Run:
vdirsyncer discover && 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
Edit Events
khal edit — interactive (requires TTY): s summary, d description, t datetime, l location, D delete, n skip, q quit
Output Formats
Placeholders: {title}, {description}, {start}, {end}, {start-date}, {start-time}, {end-date}, {end-time}, {location}, {calendar}, {uid}
Caching
Remove stale cache: rm ~/.local/share/khal/khal.db
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 58 lines · 31 tokens per session scan A 9a2421dc8dd2
caldav-calendar is a skill published in the GitHub repository marcusquinn/aidevops (423 stars, last pushed today), licensed MIT. It adds 31 tokens to every session and 490 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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