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okhp3-tradition-observance-calendar

okhp3-tradition-observance-calendar is a skill for Claude Code, Codex from OKHP3/skillz. It costs 219 tokens per session (5,038 once invoked), scanned A, original, MIT.

A tool for retrieving and formatting Jewish, Christian, and Islamic religious observance dates. It uses Hebcal for Judaism, a calculation method for Western and Orthodox Christian Easter, and AlAdhan for Islam, then can produce iCalendar files that calendar apps can import.

In plain words
What is it for?
Use it to build holiday calendars for a chosen year or tradition, fetch observance descriptions, and generate .ics calendar files. It also supports partial results when one independent source fails.
Why use it?
It brings different calendar sources into one consistent format while showing where dates are calculated, estimated, missing, or affected by a provider outage. This matters especially for Islamic dates, which depend on local moon sightings.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

not rated 3repo today A scan 219 tokens original MIT

Good fit Use it to build holiday calendars for a chosen year or tradition, fetch observance descriptions, and generate .ics calendar files. It also supports partial results when one independent source fails.

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Install with agentmods
npx agentmods add skills/okhp3/skillz/okhp3-tradition-observance-calendar
View source ↗ OKHP3/skillz
Install

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.

Any agent
npx skills add OKHP3/skillz --skill okhp3-tradition-observance-calendar
Clone the repo
git clone --depth 1 https://github.com/OKHP3/skillz

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for okhp3-tradition-observance-calendar

README.md
[![agentmods](https://agentmods.dev/badge/skills/okhp3/skillz/okhp3-tradition-observance-calendar/github.svg)](https://agentmods.dev/skills/okhp3/skillz/okhp3-tradition-observance-calendar)
Your own site
<a href="https://agentmods.dev/skills/okhp3/skillz/okhp3-tradition-observance-calendar"><img src="https://agentmods.dev/badge/skills/okhp3/skillz/okhp3-tradition-observance-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.

agentmods 80×15 button for okhp3-tradition-observance-calendar

Your own site · 80×15
<a href="https://agentmods.dev/skills/okhp3/skillz/okhp3-tradition-observance-calendar"><img src="https://agentmods.dev/badge/skills/okhp3/skillz/okhp3-tradition-observance-calendar.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 219 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,038 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00219 $0.05038
Opus 5 $0.00110 $0.02519
Sonnet 5 $0.00044 $0.01008
Haiku 4.5 $0.00022 $0.00504

Measured 12d ago against content hash 72e5e1b8acd5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

okhp3-tradition-observance-calendar scanned grade A with 1 finding 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 12d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/validate-easter.js), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

const res = await fetch(url);
abrahamic/okhp3-tradition-observance-calendar/SKILL.md · 523 lines

How it starts

The opening of the file, as written. The whole thing — 523 lines — stays where its author put it; the contents beside it link to each section on GitHub.

okhp3-tradition-observance-calendar

OverKill Hill P³ · overkillhill.com · github.com/OKHP3

Fetch, compute, and format religious observance calendars for the Abrahamic Reference Engine.

Covers Judaism (Hebcal API), Christianity (Computus algorithm -- Western and Orthodox), and Islam (AlAdhan API). All sources are free and anonymous. No API key. No cost. Zero runtime dependencies beyond fetch.

Execution contract

  • Accept a target year and optional tradition or denomination filter. Validate the year before constructing provider URLs or date objects.
  • Normalize every source into ObservanceEvent and retain the source, attribution, and caveat fields. Computed dates, provider dates, and missing dates must remain distinguishable.
  • Use Promise.allSettled for independent provider or month requests so one outage does not discard successful results. Surface partial failure in the UI or return metadata rather than hiding it.
  • Do not replace the deterministic Christian Computus path with a paid, credentialed, or unverified holiday API. Run the bundled Easter validator after algorithm changes.
  • Treat Islamic dates as calendar estimates. State the local moon-sighting caveat, and never present an estimated date as universally authoritative.
  • Fetch Wikipedia descriptions lazily, cache only non-sensitive results, and display the exact attribution string with the returned article URL.
  • Escape user- or provider-derived values before inserting them into .ics. Follow the bundled RFC 5545 line-folding and date rules.

Bundled reference files

Read these on demand -- only the file(s) you actually need for the current task:

File When to read
references/api-reference.md Full API schemas and field details for Hebcal and AlAdhan; use when you need the complete response shape or want to understand all available query parameters
references/computus.md Computus algorithm derivation, edge cases, century correction, and multi-century validation dates; use when troubleshooting Easter date accuracy
references/holiday-data.md Extended WIKIPEDIA_ARTICLE_MAP entries and supplementary AlAdhan display name notes; use when adding a holiday not covered by the map in this file
references/ics-spec.md ICS format specification, RFC 5545 line-folding rules, calendar client compatibility notes, and VTIMEZONE considerations

Read the full file on GitHub · 523 lines

Files

What ships with it

25 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.

Changes

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.

  1. 12d ago First seen · 523 lines · 219 tokens per session scan A 72e5e1b8acd5

Subscribe to this mod's changes

okhp3-tradition-observance-calendar is a skill published in the GitHub repository OKHP3/skillz (3 stars, last pushed today), licensed MIT. It adds 219 tokens to every session and 5,038 once invoked, about $0.0011 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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