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Jewish Zmanim Calculator
by
Abraham Perl
· GitHub ↗
· v1.0.0
· MIT-0
47
Downloads
0
Stars
0
Active Installs
1
Versions
Install in OpenClaw
/install zmanim-calculator
Description
Calculate Halachic times (zmanim) for any location and date. Sunrise, sunset, dawn, dusk, candle lighting, Shabbos times, Daf Yomi, and all major zmanim. Use...
Usage Guidance
This skill's core behavior — calling Hebcal to get zmanim — is coherent and the code is readable. However the SKILL.md claims extra features (NOAA algorithms, GeoNames lookup, IP auto-detection, a ~/.config file, and extra pip packages) that are not implemented in the included script. Before installing or granting automatic invocation: 1) If you expect IP-based location, NOAA-based calculations, or GeoNames lookups, do not rely on this skill — ask the author to implement or remove those claims. 2) The script makes outbound HTTPS requests to hebcal.com (and contains an unused GEONAMES_API URL); consider whether you are comfortable with network requests from this skill. 3) The suggested pip packages are unnecessary for the provided script — installing them is optional but unnecessary. 4) If you want configuration via ~/.config/zmanim/default.json, verify the script is updated to actually read it. Overall the code itself isn't obviously malicious, but the documentation is misleading — treat it as untrusted until the author clarifies or the code is updated to match the docs.
Capability Analysis
Type: OpenClaw Skill
Name: zmanim-calculator
Version: 1.0.0
The skill bundle provides a utility for calculating Jewish Halachic times (zmanim) by interfacing with the legitimate Hebcal.org API. The Python script (scripts/zmanim.py) uses standard libraries for network requests and argument parsing, contains no obfuscation, and shows no signs of data exfiltration, unauthorized execution, or malicious prompt injection.
Capability Assessment
Purpose & Capability
Name/description (zmanim via Hebcal/NOAA/GeoNames, IP auto-detect, config file) partially matches the actual code: the script calls the Hebcal API which is appropriate, but it does not implement NOAA algorithms, GeoNames lookups, IP-based geolocation, or reading the ~/.config/zmanim/default.json referenced in SKILL.md. The SKILL.md's suggested pip dependencies (hebcal-python, python-dateutil) are not used by the script. These mismatches mean the documentation promises capabilities and dependencies that aren't present.
Instruction Scope
SKILL.md instructs installing extra Python packages, creating a config file, and says 'auto-detected IP' for location; none of these are used by scripts/zmanim.py. The script only uses local hard-coded city lookups and HTTP calls to Hebcal. The instructions thus overreach and are inaccurate, which could mislead the agent or user into expecting broader behaviour.
Install Mechanism
There is no install spec (lowest risk). SKILL.md suggests pip installs, but the shipped script runs without those dependencies. No external installers or archive downloads are used. Risk from install mechanism itself is low, but the documentation recommending unnecessary packages is inconsistent.
Credentials
The skill declares no required environment variables, no credentials, and requests only python3/pip3 binaries — which is proportionate for a Python script. The script does perform outbound network calls (Hebcal over HTTPS and an unused GEONAMES_API constant), but does not request or read secrets or system config.
Persistence & Privilege
The skill is not always-enabled and does not request persistent system privileges or modify other skills. It is user-invocable and can be invoked autonomously by the agent (platform default). There is no evidence of attempts to persist credentials or alter global agent configuration.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install zmanim-calculator - After installation, invoke the skill by name or use
/zmanim-calculator - Provide required inputs per the skill's parameter spec and get structured output
Version History
v1.0.0
Initial release of zmanim-calculator.
- Calculate Halachic times (zmanim) for any location and date
- Supports sunrise, sunset, dawn, dusk, candle lighting, Shabbos times, Daf Yomi, and weekly parsha
- Uses Hebcal and NOAA algorithms for precise calculations
- Command-line tool with flexible city, zip code, or coordinates input
- Clear output format and multiple configuration options
Metadata
Frequently Asked Questions
What is Jewish Zmanim Calculator?
Calculate Halachic times (zmanim) for any location and date. Sunrise, sunset, dawn, dusk, candle lighting, Shabbos times, Daf Yomi, and all major zmanim. Use... It is an AI Agent Skill for Claude Code / OpenClaw, with 47 downloads so far.
How do I install Jewish Zmanim Calculator?
Run "/install zmanim-calculator" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is Jewish Zmanim Calculator free?
Yes, Jewish Zmanim Calculator is completely free, licensed under MIT-0. You can download, install and use it at no cost.
Which platforms does Jewish Zmanim Calculator support?
Jewish Zmanim Calculator is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created Jewish Zmanim Calculator?
It is built and maintained by Abraham Perl (@abeperl); the current version is v1.0.0.
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