io.github.hebcal/hebcal

npm

Model Context Protocol extension for Hebrew calendar

6 12.4M/wk 0 tools GitHub npm

No known CVEs

No license

Actively maintained

Last commit 5d ago

Works with most clients

Transport: stdio, sse, http

0 tools

Grade F

Edit this pageView history

Other

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "io-github-hebcal-hebcal": {
      "args": [
        "-y",
        "npm"
      ],
      "command": "npx"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-hebcal-hebcal)](https://mcppedia.org/s/io-github-hebcal-hebcal)

Read me

What io.github.hebcal/hebcal does

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

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y 'npm' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

58/100across 5 weighted dimensions

How we score →

0255075100

−42

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

8 fixed

CVE-2022-29244low · fixedCVSS 3.1

Packing does not respect root-level ignore files in workspaces

### Impact `npm pack` ignores root-level `.gitignore` & `.npmignore` file exclusion directives when run in a workspace or with a workspace flag (ie. `--workspaces`, `--workspace=<name>`). Anyone who has run `npm pack` or `npm publish` with workspaces, as of [v7.9.0](https://github.com/npm/cli/releases/tag/v7.9.0) & [v7.13.0](https://github.com/npm/cli/releases/tag/v7.13.0) respectively, may be affected and have published files into the npm registry they did not intend to include. ### Patch - Up

Affected: >= 7.9.0Fixed in 8.11.0source →

CVE-2018-7408low · fixedCVSS 3

Incorrect Permission Assignment for Critical Resource in NPM

An issue was discovered in an npm 5.7.0 2018-02-21 pre-release (marked as "next: 5.7.0" and therefore automatically installed by an "npm upgrade -g npm" command, and also announced in the vendor's blog without mention of pre-release status). It might allow local users to bypass intended filesystem access restrictions because ownerships of /etc and /usr directories are being changed unexpectedly, related to a "correctMkdir" issue.

Affected: >= 0Fixed in 5.7.1source →

CVE-2013-4116info · fixed

Local Privilege Escalation in npm

Affected versions of `npm` use predictable temporary file names during archive unpacking. If an attacker can create a symbolic link at the location of one of these temporary file names, the attacker can arbitrarily write to any file that the user which owns the `npm` process has permission to write to, potentially resulting in local privilege escalation. ## Recommendation Update to version 1.3.3 or later.

Affected: >= 0Fixed in 1.3.3source →

CVE-2020-15095low · fixedCVSS 3.1

npm CLI exposing sensitive information through logs

Versions of the npm CLI prior to 6.14.6 are vulnerable to an information exposure vulnerability through log files. The CLI supports URLs like `<protocol>://[<user>[:<password>]@]<hostname>[:<port>][:][/]<path>`. The password value is not redacted and is printed to stdout and also to any generated log files.

Affected: >= 0Fixed in 6.14.6source →

CVE-2019-16777low · fixedCVSS 3.1

npm Vulnerable to Global node_modules Binary Overwrite

Versions of the npm CLI prior to 6.13.4 are vulnerable to a Global node_modules Binary Overwrite. It fails to prevent existing globally-installed binaries to be overwritten by other package installations. For example, if a package was installed globally and created a `serve` binary, any subsequent installs of packages that also create a `serve` binary would overwrite the first binary. This will not overwrite system binaries but only binaries put into the global node_modules directory. This b

Affected: >= 0Fixed in 6.13.4source →

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is io.github.hebcal/hebcal safe to use?: io.github.hebcal/hebcal has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
How do I install io.github.hebcal/hebcal?: io.github.hebcal/hebcal supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What AI clients work with io.github.hebcal/hebcal?: io.github.hebcal/hebcal is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is io.github.hebcal/hebcal actively maintained?: io.github.hebcal/hebcal is actively maintained — last commit was 5 days ago. It has 6 GitHub stars.

Similar servers

Others in other

View all →

io.github.wyre-technology/spanning-mcp90

MCP server for Spanning Cloud Backup — M365/GWS/Salesforce backups, restores, audit.

io.github.codeofaxel/kiln88

AI agent control of 3D printers — 432 tools for OctoPrint, Moonraker, Bambu, Prusa, Elegoo

18 11

io.github.wyre-technology/autotask-mcp88

MCP server for Kaseya Autotask PSA — companies, tickets, projects, time entries, and more.

36 6

io.github.AnchorRegistry/ar-mcp88

On-chain provenance lookup for AnchorRegistry. Resolve AR-IDs, hashes, and full trees. Authless.

MCP Security Weekly

Get CVE alerts and security updates for io.github.hebcal/hebcal and similar servers.

Community

Discussion

Start a conversation

Ask a question, share a tip, or report an issue.

Has anyone used this with Cursor?How do you handle auth?Any alternatives?

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

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.

This repository is the MCP server equivalent of the powerful custom Jewish calendar tool that lets you generate a list of Jewish holidays for any year (past, present or future).

Running the Server

This MCP server can run in two modes:

Stdio Mode (default): Communicates over standard input/output.

npm install
npm run build
node build/cli.js

Server-Sent Events (SSE) Mode: Communicates over HTTP using SSE.

npm install
npm run build
node build/server.js

The SSE endpoint will be available at http://localhost:8080/mcp by default. You can configure the port using the NODE_PORT environment variable (e.g., NODE_PORT=3000 node build/server.js).

You can test the SSE endpoint with curl:

curl -N http://localhost:8080/mcp

Then, in a separate terminal, you can send MCP requests (as JSON) to the server via its stdin if you are also running it in stdio mode, or by sending HTTP POST requests if you were to implement an HTTP ingress for requests. For now, the SSE transport only handles outgoing messages. For a full duplex SSE communication, the client would also need to send requests to the server (e.g. via POST requests to a different endpoint). This example focuses on the server sending events to the client.

Frequently Asked Questions

Is io.github.hebcal/hebcal safe to use?

io.github.hebcal/hebcal has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.

How do I install io.github.hebcal/hebcal?

io.github.hebcal/hebcal supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What AI clients work with io.github.hebcal/hebcal?

io.github.hebcal/hebcal is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.

Is io.github.hebcal/hebcal actively maintained?

io.github.hebcal/hebcal is actively maintained — last commit was 5 days ago. It has 6 GitHub stars.

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

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.

This repository is the MCP server equivalent of the powerful custom Jewish calendar tool that lets you generate a list of Jewish holidays for any year (past, present or future).

Also available are a Hebrew date converter, Shabbat candle lighting times and Torah readings (both full kriyah and triennial system), and a page to look up yahrzeits, birthdays and anniversaries.

Running the Server

This MCP server can run in two modes:

Stdio Mode (default): Communicates over standard input/output.
```
npm install
npm run build
node build/cli.js
```
Server-Sent Events (SSE) Mode: Communicates over HTTP using SSE.
```
npm install
npm run build
node build/server.js
```
The SSE endpoint will be available at http://localhost:8080/mcp by default. You can configure the port using the NODE_PORT environment variable (e.g., NODE_PORT=3000 node build/server.js).

You can test the SSE endpoint with curl:
```
curl -N http://localhost:8080/mcp
```
Then, in a separate terminal, you can send MCP requests (as JSON) to the server via its stdin if you are also running it in stdio mode, or by sending HTTP POST requests if you were to implement an HTTP ingress for requests. For now, the SSE transport only handles outgoing messages. For a full duplex SSE communication, the client would also need to send requests to the server (e.g. via POST requests to a different endpoint). This example focuses on the server sending events to the client.