Gatekeeper

Name: Gatekeeper
Author: Runestone-Labs

by Runestone-Labsversion 0.1.2i★ –iRuns on your computer

Registry nameio.github.Runestone-Labs/gatekeeper

Install

Overview

Description from the maker (original English)

Run MCP tool calls through Runestone Gatekeeper — policy enforcement, human approval, audit.

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
UsageiNot measured yet★ –

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: Other
You need to fill in: GATEKEEPER_ROLE

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).
You fill in yourself: GATEKEEPER_ROLE, GATEKEEPER_URL, GATEKEEPER_AGENT_NAME, GATEKEEPER_RUN_ID

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": {
    "gatekeeper": {
      "command": "npx",
      "args": [
        "-y",
        "@runestone-labs/gatekeeper-mcp"
      ],
      "env": {
        "GATEKEEPER_ROLE": "your-value",
        "GATEKEEPER_URL": "your-value",
        "GATEKEEPER_AGENT_NAME": "your-value",
        "GATEKEEPER_RUN_ID": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add gatekeeper --env GATEKEEPER_ROLE=your-value --env GATEKEEPER_URL=your-value --env GATEKEEPER_AGENT_NAME=your-value --env GATEKEEPER_RUN_ID=your-value -- npx -y @runestone-labs/gatekeeper-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

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

{
  "mcpServers": {
    "gatekeeper": {
      "command": "npx",
      "args": [
        "-y",
        "@runestone-labs/gatekeeper-mcp"
      ],
      "env": {
        "GATEKEEPER_ROLE": "your-value",
        "GATEKEEPER_URL": "your-value",
        "GATEKEEPER_AGENT_NAME": "your-value",
        "GATEKEEPER_RUN_ID": "your-value"
      }
    }
  }
}

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": {
    "gatekeeper": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@runestone-labs/gatekeeper-mcp"
      ],
      "env": {
        "GATEKEEPER_ROLE": "your-value",
        "GATEKEEPER_URL": "your-value",
        "GATEKEEPER_AGENT_NAME": "your-value",
        "GATEKEEPER_RUN_ID": "your-value"
      }
    }
  }
}

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.

Values you fill in

GATEKEEPER_ROLE required env
Policy role this server presents to Gatekeeper for every call. Required.
GATEKEEPER_URL env
Base URL of the Gatekeeper server. Default http://127.0.0.1:3847.
GATEKEEPER_AGENT_NAME env
Agent name recorded in Gatekeeper audit logs. Default mcp-client.
GATEKEEPER_RUN_ID env
Optional run-correlation id so calls count toward one per-run budget.

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 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Runestone-Labs, 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 Otheri

More stars than 0% of the other 32484 servers in this category
Published to the registry more recently than 33% of the other 32484 servers in this category
Basic checks equal to or better than 100% of the other 32484 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 Gatekeeper 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?

You need to fill in: GATEKEEPER_ROLE

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 (0.1.2) reached the registry 2 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: Spec Driven Development, Remote Desktop Commander, Recta

Alternatives

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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.

Runestone Gatekeeper — MCP Server

An MCP server that lets any MCP client (Claude Desktop, Claude Code, Cursor, …) run real tool calls — shell, file writes, HTTP, or any Gatekeeper tool — only through [Runestone Gatekeeper](https://github.com/Runestone-Labs/gatekeeper). Every call is policy-checked, may require human approval, and is audited. The model never touches your systems directly; Gatekeeper sits in front.

MCP client (LLM)  ──tools/call──▶  gatekeeper-mcp  ──policy-gated──▶  Gatekeeper  ──▶  shell / files / HTTP

Requirements

A running Gatekeeper server (see the repo root). This package is just the MCP front door; it does nothing on its own.

Install / configure

It runs over stdio. Add it to your MCP client config, e.g. Claude Desktop (claude_desktop_config.json):

"mcpServers": { "gatekeeper": { "command": "npx", "args": ["-y", "@runestone-labs/gatekeeper-mcp"], "env": { "GATEKEEPER_URL": "http://127.0.0.1:3847", "GATEKEEPER_ROLE": "openclaw" } } } }

Env	Required	Default	Meaning
`GATEKEEPER_ROLE`	yes	—	The policy role this server presents to Gatekeeper for every call.
`GATEKEEPER_URL`	no	`http://127.0.0.1:3847`	Gatekeeper base URL.
`GATEKEEPER_AGENT_NAME`	no	`mcp-client`	Name recorded in audit logs.

Shared approvals for unattended agents

Local Gatekeeper and this MCP integration are free. Need a teammate to handle approvals while your agents run unattended? We're testing Gatekeeper Team at $49/month, for up to five members and five instances. The proposed Cloud service would coordinate a held action, a teammate's approval or denial, and a record of the outcome. Cloud is planned, not publicly available, and no payment is collected during this test. Only actions actually routed through Gatekeeper are covered; installing the MCP server does not cover a client's other tools.

See the proposed workflow and share your team's needs. The form also lets you optionally report a first real routed action or return use on a later day. These are manual self-reports, not verified external activation. Don't send commands or raw audit logs; this test adds no automatic usage reporting to the MCP server.

Tools

Tool	Gatekeeper tool	Use
`shell_exec`	`shell.exec`	Run a shell command.
`files_write`	`files.write`	Write a file.
`http_request`	`http.request`	HTTP GET/POST (egress-policed).
`gatekeeper_call`	(any)	Generic escape hatch — call any Gatekeeper tool (e.g. `memory.query`) by name.
`gatekeeper_health`	—	Check the Gatekeeper server is reachable.

Every gated call returns one of:

allow → the tool output.
deny → an *error* result explaining why (the call did not run).
approve → an *error* result saying a human must approve it in Gatekeeper; the call did not run.

Security model

This server is a policy boundary, so it is deliberately strict:

Identity is pinned server-side. Role comes from GATEKEEPER_ROLE; origin is fixed to model_inferred and taint to mcp_client. The MCP client cannot set or override actor / role / origin / taint / capability tokens via tool arguments — there is no code path from a tool argument to any of those.
Fail closed. A deny, a pending approval, or *any* malformed/unexpected Gatekeeper response is surfaced as an error — never as a successful result.
No endpoint traversal. Generic tool names are validated as strict dotted identifiers; ../, slashes, and the like are rejected before any request.
No leakage. The Gatekeeper URL and anything resembling a credential are scrubbed from error messages before they reach the client.

These invariants are covered by an adversarial test suite (src/*.test.ts).

Distribution

Published to npm as @runestone-labs/gatekeeper-mcp and listed on the MCP Registry as io.github.runestone-labs/gatekeeper (see server.json). The MCP Registry is in preview.

License

Apache-2.0

Gatekeeper

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

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 Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Recta

README from the maker

Runestone Gatekeeper — MCP Server

Requirements

Install / configure

Shared approvals for unattended agents

Tools

Security model

Distribution

License