Hebcal
Query Hebrew calendar dates, holidays, and related data from Hebcal inside your agent while building apps for Jewish communities or scheduling features.
Overview
Hebcal is a MCP server for the Build phase that exposes Hebrew calendar and holiday data to agents via Hebcal’s official MCP extension.
What is this MCP server?
- Official Hebcal Model Context Protocol extension for Hebrew calendar data
- Hosted streamable-http endpoint at https://www.hebcal.com/mcp
- Local stdio option via NPM package @hebcal/mcp (registry version 0.9.8)
- Server metadata version 0.9.9 with GitHub source hebcal-mcp
- Supports both remote and self-run transports for flexibility
- Remote MCP URL https://www.hebcal.com/mcp (streamable-http)
- Published server version 0.9.9; npm package @hebcal/mcp at 0.9.8
- Two transport options: remote HTTP and local stdio
Community signal: 6 GitHub stars.
What problem does it solve?
Apps and agents guess Jewish dates and holidays without a reliable calendar API, causing wrong Shabbat/Yom Tov UI and broken scheduling logic.
Who is it for?
Indie devs building Jewish community apps, event sites, or multilingual products that need correct holiday-aware date logic.
Skip if: Products with no calendar or locale requirements, or teams that need proprietary calendaring unrelated to the Hebrew calendar.
What do I get? / Deliverables
After you add Hebcal MCP, your agent can fetch authoritative Hebrew calendar information while you implement features or content calendars.
- Agent-queryable Hebrew calendar and holiday data in dev sessions
- Dual deployment paths: hosted MCP URL or local npm stdio server
- Reduced calendar bugs in Jewish-community-facing features
Recommended MCP Servers
Journey fit
Hebcal MCP lands in Build because it is a data integration you wire into product features rather than a launch or growth tactic by itself. Integrations subphase matches a calendar API exposed over MCP—agents fetch authoritative dates without scraping hebcal.com manually.
How it compares
Calendar data MCP integration, not an SEO or analytics server.
Common Questions / FAQ
Who is Hebcal for?
Builders creating apps or agent workflows that must respect Hebrew dates, parsha, or holidays using Hebcal’s established calendar service.
When should I use Hebcal?
Use it during Build when implementing date pickers, notification blackout windows, holiday-themed content, or locale-specific scheduling features.
How do I add Hebcal to my agent?
Either point your MCP client at https://www.hebcal.com/mcp (streamable-http) or install @hebcal/mcp from npm and register the stdio server locally.