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 lucaperret/agent-skills --skill macos-calendargit clone --depth 1 https://github.com/lucaperret/agent-skillsWrote 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/lucaperret/agent-skills/macos-calendar)<a href="https://agentmods.dev/skills/lucaperret/agent-skills/macos-calendar"><img src="https://agentmods.dev/badge/skills/lucaperret/agent-skills/macos-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/lucaperret/agent-skills/macos-calendar"><img src="https://agentmods.dev/badge/skills/lucaperret/agent-skills/macos-calendar.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
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 | $0.00092 | $0.01570 |
| Opus 5.5 | $0.00037 | $0.00628 |
| Sonnet 5.5 | $0.00018 | $0.00314 |
| Haiku 4.5 | $0.00009 | $0.00157 |
Grade A, and why
macos-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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.
macOS Calendar
Manage Apple Calendar events via $SKILL_DIR/scripts/calendar.sh. All date handling uses relative math (current date + N * days) to avoid locale issues (FR/EN/DE date formats).
Quick start
List calendars
Always list calendars first to find the correct calendar name:
"$SKILL_DIR/scripts/calendar.sh" list-calendars
Create an event
echo '<json>' | "$SKILL_DIR/scripts/calendar.sh" create-event
JSON fields:
| Field | Required | Default | Description |
|---|---|---|---|
summary |
yes | - | Event title |
calendar |
no | first calendar | Calendar name (from list-calendars) |
description |
no | "" | Event notes |
offset_days |
no | 0 | Days from today (0=today, 1=tomorrow, 7=next week) |
iso_date |
no | - | Absolute date YYYY-MM-DD (overrides offset_days) |
hour |
no | 9 | Start hour (0-23) |
minute |
no | 0 | Start minute (0-59) |
duration_minutes |
no | 30 | Duration |
alarm_minutes |
no | 0 | Alert N minutes before (0=no alarm) |
all_day |
no | false | All-day event |
recurrence |
no | - | iCal RRULE string. See references/recurrence.md |
Interpreting natural language
Map user requests to JSON fields:
| User says | JSON |
|---|---|
| "tomorrow at 2pm" | offset_days: 1, hour: 14 |
| "in 3 days" | offset_days: 3 |
| "next Monday at 10am" | Calculate offset_days from today to next Monday, hour: 10 |
| "February 25 at 3:30pm" | iso_date: "2026-02-25", hour: 15, minute: 30 |
| "every weekday at 9am" | hour: 9, recurrence: "FREQ=WEEKLY;BYDAY=MO,TU,WE,TH,FR" |
| "remind me 1 hour before" | alarm_minutes: 60 |
| "all day event on March 1" | iso_date: "2026-03-01", all_day: true |
For "next Monday", "next Friday" etc: compute the day offset using the current date. Use date command if needed:
# Days until next Monday (1=Monday)
target=1; today=$(date +%u); echo $(( (target - today + 7) % 7 ))
Example prompts
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2mo ago First seen · 130 lines · 92 tokens per session scan A def5b9704ede
macos-calendar is a skill published in the GitHub repository lucaperret/agent-skills (7 stars, last pushed 7mo ago), licensed MIT. It adds 92 tokens to every session and 1,570 once invoked, about $0.0004 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 2026-08-31.
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