Cyberchef MCP Server

by doublegate Your server? Claim it

local only

Cyberchef MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 203 installs a week from npm. Last commit 1 Nov 2026.

CyberChef's 504 data-transformation operations as MCP tools: encryption, encoding, forensics.

Installs per day peak 854 · avg 84 · -31% w/w

a month agotoday

203

Installs / week

npm · cyberchef-mcp

Stars

2 open issues

1 Nov 2026

Last commit

22 releases in 90 days

GPL-3.0

License

JavaScript

What the code does

We read the source, 6 d ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Runs a command on install [пакет] package.json:1

postinstall: node scripts/patch-dependencies.mjs

File ships in the package but is absent from the source [пакет] src/core/config/modules/Bletchley.mjs:1, [пакет] src/core/config/modules/Charts.mjs:1, [пакет] src/core/config/modules/Ciphers.mjs:1 и ещё 25

этот файл ставится пользователю, но в репозитории его нет

Runs an external command conformance/run.mjs:106

        const child = spawn(command, args, { stdio: "inherit", ...options });

Image runs as root Dockerfile.mcp:47

# Run as root for build operations (Chainguard -dev includes root user)
USER root

Touches key and credential files src/node/tools/hash-identify.mjs:46, [пакет] src/node/tools/hash-identify.mjs:46

        note: "Linux /etc/shadow default on most modern distributions." },

Long encoded blob in source src/node/tools/lib/english-trigrams.mjs:52, [пакет] src/node/tools/lib/english-trigrams.mjs:52

    "NgAwAHEAawALABAAEAAAABAAAAAAAGsAEAB9AQUAIAAFAFYAKwDHAFEABQAAAAAAAAAFAGEDOwB2AAUAAAYLAAUABQCvDQAAAACpHgAABQDrBQAABQAXAQ4CBQBCAQsACwAAANcAAABDBAAA9ggLAB8OBQAAAK8WwwEAAO0gUQMQAAAAZwYVABUAGAQVAO0mVgALAAsAAAC3AwAAsgaoAT0B4RRVDhcB1wAgAAsJhgALAOIACQXnACsGFwELAC8CswR1ApYAXQTMAAAAxwY…

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add cyberchef-mcp -- npx -y cyberchef-mcp

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

{
  "mcpServers": {
    "cyberchef-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "cyberchef-mcp"
      ]
    }
  }
}

~/.codex/config.toml

[mcp_servers.cyberchef-mcp]
command = "npx"
args = ["-y", "cyberchef-mcp"]

.cursor/mcp.json

{
  "mcpServers": {
    "cyberchef-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "cyberchef-mcp"
      ]
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "cyberchef-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "cyberchef-mcp"
      ]
    }
  }
}

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answering

Cyberchef MCP — questions

Answers built from our own checks of this server.

Why is there no uptime for Cyberchef MCP?

Cyberchef MCP runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package cyberchef-mcp was installed 203 times last week.

How do I connect Cyberchef MCP?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls cyberchef-mcp straight from npm; nothing to host, nothing to sign up for.

How many people use Cyberchef MCP?

The npm package cyberchef-mcp was installed 203 times in the last week. Week over week that is -31%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Cyberchef MCP open source?

Yes — it is published under the GPL-3.0 licence, written in JavaScript, 33 stars on GitHub and 2 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.