Hebcal

io.github.hebcalPublished by GitHub account hebcalv0.9.9Updated Oct 24, 2026

Model Context Protocol extension for Hebrew calendar

VerifiedStreamable HTTPWeb executableLocation & LifestyleKnowledge & Memory

Overview

AI-generated overview

Hebcal MCP server that lets an assistant convert dates between Gregorian and Hebrew calendars and look up Jewish holidays, Torah portions, Daf Yomi, Shabbat and

What you can do
Convert dates between Gregorian and Hebrew calendars in both directions, with the Hebrew date returned for a given civil date and vice versa. Look up Jewish holidays for a whole Gregorian year. Get Shabbat and holiday candle-lighting and Havdalah times for a location and date range. Find the weekly Torah portion and the Daf Yomi for a given date. Calculate a Yahrzeit anniversary according to the Hebrew calendar.
When to use it
Useful when an assistant needs Jewish calendar facts: converting dates, planning around holidays or Shabbat times, or answering questions about Torah portions, Daf Yomi study and Yahrzeit dates.
Requirements
Can be used as a remote endpoint at hebcal.com or run locally as the npm package @hebcal/mcp over stdio. No authentication, environment variables or headers are declared. Shabbat times need a location.
Before you install
The README says the repository has moved to another project and is archived and read-only, so the published package may be out of date. The tools only calculate and return calendar information; no data is written or changed.

Installation

In SourceWeft

  1. Open Hebcal in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.hebcal%2Fhebcal/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "hebcal": {
      "type": "http",
      "url": "https://www.hebcal.com/mcp"
    }
  }
}

README

Hebcal Jewish holidays and Hebrew calendar Model Context Protocol (MCP) server

This repository has moved. This functionality now lives at hebcal/hebcal-api-go. This repo is archived and read-only; please file issues and send pull requests there instead.

Hebcal (pronounced HEEB-kal, as in Hebrew calendar) is a free Jewish calendar and holiday web site.

Our mission is to increase awareness of Jewish holidays and to help Jews to be observant of the mitzvot.

Source: README.md at commit a38b72d

Tools

7

convert-gregorian-to-hebrew

Converts a Gregorian (civil) date to a Hebrew date (Jewish calendar)

Parametersdaterequired

convert-hebrew-to-gregorian

Converts a Hebrew date to a Gregorian (civil) date

Parametersdayrequiredyearrequiredmonthrequired

daf-yomi

Calculates the Daf Yomi (Babylonian Talmud) learning for a specified date

Parametersdaterequired

jewish-holidays-year

Calculates a list of all Jewish holidays during a Gregorian (civil) year

Parametersyearrequired

shabbat-times

Generates Shabbat and holiday candle-lighting and Havdalah times for a given location and date range

ParameterstzidrequiredendDaterequiredlatituderequiredlongituderequiredstartDaterequired

torah-portion

Calculates the weekly Torah portion (also called parashat haShavua) for a specified date

Parametersilrequireddaterequired

yahrzeit

Calculates the Yahrzeit, the anniversary of the day of death of a loved one, according to the Hebrew calendar for a specified date

ParametersdaterequiredafterSunsetrequired

Version history

1
  1. v0.9.9LatestSep 16, 2026

Score

100% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts