Citadel MCP

Name: Citadel MCP
Author: sustinbebustin

by sustinbebustinversion 2.2.0i★ –iRuns on your computer

Registry nameio.github.sustinbebustin/citadel-mcp

Install

Overview

Description from the maker (original English)

A growing Citadel of stack-specific docs, served as MCP tools for AI coding agents.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiVery new↓ 56/wk · ★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Developer tools

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

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

Run this in your terminal

claude mcp add citadel -- npx -y citadel-mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

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

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

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

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 9, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account sustinbebustin, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Developer toolsi

More stars than 0% of the other 5570 servers in this category
Published to the registry more recently than 12% of the other 5570 servers in this category
Basic checks equal to or better than 100% of the other 5570 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Citadel MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (2.2.0) reached the registry 6 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: GitHub, Desktop Commander, Cloudflare MCP

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

GitHub

GitHub’s official server lets AI read and manage code, issues and pull requests in your account. Use GitHub’s hosted version or run it locally with Docker.

by githubWidely used★ 34.2KUpdated 6 days ago

Computer or cloud

Install

Desktop Commander

MCP server for terminal commands, file operations, and process management

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Runs on your computer

Install

Cloudflare MCP

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by cloudflareWidely used★ 4.4KUpdated 14 months ago

Runs in the cloud✓ mcp.cloudflare.com

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Citadel MCP

A Code Mode MCP server that gives AI coding agents curated, per-stack documentation as typed tools.

Citadel is built to be forked and tailored. The hosted package ships with a small starter set of stacks, but the real value comes from packaging the docs your agents actually need. Each stack is a tiny module — adding one is mostly mechanical.

Getting Started

Requirements

Node.js v20.19 or a newer latest maintenance LTS version
npm or pnpm

Install with add-mcp

Install the MCP server for all your coding agents:

npx add-mcp citadel-mcp@latest

Add -y to skip the confirmation prompt and install to all detected agents already in use in the project directory. Add -g to install globally across all projects.

Manual installation

Add the following config to your MCP client:

"mcpServers": { "citadel": { "command": "npx", "args": ["-y", "citadel-mcp@latest"] } } }

[!NOTE]

Using citadel-mcp@latest ensures that your MCP client will always use the latest version of the Citadel MCP server.

MCP Client Configuration

Amp

Using Amp CLI:

amp mcp add citadel -- npx citadel-mcp@latest

Or configure manually:

Follow Amp's MCP documentation and apply the standard configuration shown above.

Claude Code

Use the Claude Code CLI to add the Citadel MCP server:

claude mcp add -s user citadel -- npx -y citadel-mcp@latest

Use -s project instead of -s user to scope the install to the current project. Restart Claude Code, then verify with claude mcp list. A working server advertises a single tool named docs.

Codex

Using Codex CLI:

codex mcp add citadel -- npx citadel-mcp@latest

Or configure manually:

Follow the MCP setup guide with the standard configuration format:

Command: npx
Arguments: -y, citadel-mcp@latest

Cursor

Go to Cursor Settings -> MCP -> New MCP Server. Use the JSON config provided above.

Gemini

Using Gemini CLI:

Project-wide installation:

gemini mcp add citadel npx citadel-mcp@latest

Global installation:

gemini mcp add -s user citadel npx citadel-mcp@latest

VS Code / Copilot

Using VS Code CLI:

code --add-mcp '{"name":"citadel","command":"npx","args":["-y","citadel-mcp@latest"]}'

Or configure manually:

Follow the official VS Code MCP server setup guide and add the Citadel server through VS Code settings.

Warp

Navigate to Settings | AI | Manage MCP Servers and select + Add to register a new MCP server with the following configuration:

Name: citadel
Command: npx
Arguments: -y, citadel-mcp@latest

What you get out of the box

The hosted package includes a starter set of stacks so you can try it immediately:

Next.js (App Router, Next.js 16)
React
Turborepo
Supabase guides

This list is intentionally small. For the best results, fork this repo and add the stacks your agents care about — your internal libraries, the framework version you actually use, or any docs site that publishes machine-readable markdown. See docs/adding-a-docs-tool.md.

How it works

Citadel is a Code Mode server: instead of advertising one tool per docs source, it advertises a single docs tool. The agent writes one async () => { ... } per turn that calls codemode. _docs(...) and codemode. _index() directly, and the server runs that code in a local Node sandbox. N doc fetches collapse into one round-trip.

Each stack contributes two callable tools to the sandbox SDK:

_index() — returns the doc index so the agent can pick a valid path
_docs({ path }) — fetches that specific doc as markdown

Citadel also exposes a cross-stack ranked search: codemode.docs_search({ query, stacks?, fetch: true }) returns BM25-ranked matches with markdown content attached in a single call.

Documentation

Using Citadel as an AI agent — playbook for the docs tool, served at runtime as MCP resource citadel://docs/agent-usage. SDK reference, parallel fan-out, error handling, worked examples.
Adding a docs tool — package a new stack as _index + _docs.

Local Development

To run the MCP server locally for development:

Clone the repository.
Install and build:

   pnpm install

pnpm build

3. Configure your MCP client to use the local version:

"mcpServers": { "citadel-dev": { "command": "node", "args": ["/absolute/path/to/citadel-mcp/dist/index.js"] } } }

Or with the Claude Code CLI:

   claude mcp add -s user citadel-dev -- node /absolute/path/to/citadel-mcp/dist/index.js

For development with auto-reload, point the MCP client at tsx and the src entry instead:

claude mcp add -s user citadel-dev -- npx tsx /absolute/path/to/citadel-mcp/src/index.ts

License

MIT

Citadel MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Developer toolsi

Common questions

Alternatives

GitHub

Desktop Commander

Cloudflare MCP

README from the maker

Citadel MCP

Getting Started

Requirements

Install with add-mcp

Manual installation

MCP Client Configuration

What you get out of the box

How it works

Documentation

Local Development

License