Is calendar-accuracy safe to install?

SaferSkills independently audited calendar-accuracy (Agent Skill) and scored it 100/100 (green). The audit ran 55 deterministic rules across Security, Supply Chain, Maintenance, Transparency, and Community; it found 0 high-severity and 0 lower-severity findings. The full rule-by-rule trace and per-finding evidence are below. Free, methodology-open.

CategoryWeightCategory scoreContribution

Securityprompt, exec, net, exfil, eval

35%

100

35.0 pts

Supply chainhash, typosquat, maintainer, lockfile

20%

100

20.0 pts

Maintenancestaleness, pinning, CI

15%

100

15.0 pts

TransparencySKILL.md, perms, README

15%

100

15.0 pts

Communityinstalls, verify, response

15%

100

15.0 pts

Findings & checks · 0 flagged

Securityscore 100 · 0 findings

✓—All security checks passedNo findings in this category for the latest scan.pass

Supply chainscore 100 · 0 findings

✓—All supply chain checks passedNo findings in this category for the latest scan.pass

Maintenancescore 100 · 0 findings

✓—All maintenance checks passedNo findings in this category for the latest scan.pass

Transparencyscore 100 · 0 findings

✓—All transparency checks passedNo findings in this category for the latest scan.pass

Communityscore 100 · 0 findings

✓—All community checks passedNo findings in this category for the latest scan.pass

The primary manifest — the file an agent reads to learn what this artifact does.

SKILL.md · 1 file

SKILL.md2.9 KB · Markdown

name: calendar-accuracy

description: Ensure accurate calendar and date calculations in responses. Use for ANY query involving dates, days of week, date arithmetic, scheduling, holidays, time periods, countdowns, or relative date expressions. Triggers on questions like "what day is [date]", "how many days until", "when is [event]", "X days/weeks/months from [date]", calendar planning, and scheduling tasks.

license: MIT

Calendar Accuracy

Verify all date-related claims before including them in responses. Never guess dates or days of week—calendar calculations are error-prone for LLMs.

Examples

"What day of the week is January 29, 2025?" → Run python scripts/date_calc.py weekday 2025-01-29
"What's the date 30 days from now?" → Run python scripts/date_calc.py add today 30 days
"How many days until Christmas?" → Run python scripts/date_calc.py diff today 2025-12-25
"When are the holidays this year?" → Run python scripts/date_calc.py holidays
"What are US holidays in 2025?" → Run python scripts/date_calc.py holidays 2025 --country US
"List the dates for next week" → Run python scripts/date_calc.py range 2025-02-03 2025-02-09

Guidelines

Always verify date claims using scripts/date_calc.py before responding
State full dates with day of week: "Wednesday, January 29, 2025"
For countdowns, show both the count and the target date
Acknowledge ambiguity in relative expressions ("next Friday" can mean different things)
Double-check edge cases: leap years, month-end arithmetic, week numbers

Script Usage

# Full date information
python scripts/date_calc.py info 2025-01-29

# Add/subtract time
python scripts/date_calc.py add 2025-01-29 30 days
python scripts/date_calc.py add 2025-01-29 -2 weeks
python scripts/date_calc.py add 2025-01-29 3 months

# Difference between dates
python scripts/date_calc.py diff 2025-01-01 2025-12-31

# Date range listing
python scripts/date_calc.py range 2025-01-01 2025-01-07

# Holidays (defaults to current year, TW)
python scripts/date_calc.py holidays
python scripts/date_calc.py holidays 2025
python scripts/date_calc.py holidays --country US
python scripts/date_calc.py holidays 2025 --country JP
python scripts/date_calc.py holidays --country list  # Show all supported countries

# Day of week only
python scripts/date_calc.py weekday "March 15, 2025"

Common Errors to Avoid

Month arithmetic overflow: Jan 31 + 1 month → Feb 28/29, not Feb 31
Leap year assumptions: Always verify if Feb 29 exists in the year
Week number confusion: ISO weeks don't align with calendar months
Day-of-week guessing: Never estimate—always calculate

Quick Reference

Days in months: Jan=31, Feb=28/29, Mar=31, Apr=30, May=31, Jun=30, Jul=31, Aug=31, Sep=30, Oct=31, Nov=30, Dec=31
2025 Doomsday: Friday (4/4, 6/6, 8/8, 10/10, 12/12 are all Fridays)
See references/calendar_rules.md for leap year rules, holiday calculations, and verification methods

calendar-accuracy— agent skill

Is calendar-accuracy safe to install?

Calendar Accuracy

Examples

Guidelines

Script Usage

Common Errors to Avoid

Quick Reference

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