Convert between Gregorian and Hebrew calendars, find Jewish holidays, Shabbat times, and Torah portions.
Connects to Hebcal's Hebrew calendar service. Muse can convert dates between calendars, show Jewish holidays for any year, calculate Shabbat candle-lighting times for your location, find weekly Torah portions, and track Yahrzeit anniversaries.
Try asking Muse: "What time should I light Shabbat candles this Friday in New York?"
Source: Found in the official MCP Registry (io.github.hebcal/hebcal) · First listed September 25, 2026
Each bar is one check, every 15 minutes. Green means it answered. Last checked 4 h ago.
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
musedirectory.ai is not part of Meta. More about how Muse handles your information
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://www.hebcal.com/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Hebcal is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
In Claude, open Settings, then Connectors.
Choose Add custom connector, give it a name, and paste the link.
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://www.hebcal.com/mcpResponse time at the last check: 734ms. Worked in 99.1% of checks over 30 days.
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
convert-gregorian-to-hebrewConverts a Gregorian (civil) date to a Hebrew date (Jewish calendar)convert-hebrew-to-gregorianConverts a Hebrew date to a Gregorian (civil) datedaf-yomiCalculates the Daf Yomi (Babylonian Talmud) learning for a specified datejewish-holidays-yearCalculates a list of all Jewish holidays during a Gregorian (civil) yearshabbat-timesGenerates Shabbat and holiday candle-lighting and Havdalah times for a given location and date rangetorah-portionCalculates the weekly Torah portion (also called parashat haShavua) for a specified dateyahrzeitCalculates the Yahrzeit, the anniversary of the day of death of a loved one, according to the Hebrew calendar for a specified datehttps://www.hebcal.com/mcpNot in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Hebcal to help me. It is a free service with an MCP server at https://www.hebcal.com/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
At the last check (November 13, 2026, 10:00 UTC) the endpoint was working, answering in 734ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
It was screened on September 25, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
It exposes 7 tools, including convert-gregorian-to-hebrew, convert-hebrew-to-gregorian, daf-yomi, jewish-holidays-year. For example, you could ask Muse: "What time should I light Shabbat candles this Friday in New York?"
This listing was added from public sources (Found in the official MCP Registry (io.github.hebcal/hebcal)). If you build Hebcal, claim it to correct the details and get your badge.
Paste this on your site or README. It always shows the latest check.
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