Guardian MCP

Name: Guardian MCP
Author: Odingard

by Odingardversion 0.3.2i★ –iRuns on your computer

Registry nameio.github.Odingard/guardian-mcp

Install

Overview

Description from the maker (original English)

Routes agent tool calls through Guardian for ALLOW/ASK/DENY before execution.

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: GUARDIAN_BASE_URL, GUARDIAN_AGENT_CREDENTIAL, GUARDIAN_CONNECTION_ID

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: GUARDIAN_BASE_URL, GUARDIAN_AGENT_CREDENTIAL, GUARDIAN_CONNECTION_ID, GUARDIAN_ADAPTER_ID

Values marked secret are keys to your account. Never share them or paste them into a chat.

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": {
    "guardian": {
      "command": "npx",
      "args": [
        "-y",
        "@odingard/guardian-mcp"
      ],
      "env": {
        "GUARDIAN_BASE_URL": "your-value",
        "GUARDIAN_AGENT_CREDENTIAL": "your-value",
        "GUARDIAN_CONNECTION_ID": "your-value",
        "GUARDIAN_ADAPTER_ID": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add guardian --env GUARDIAN_BASE_URL=your-value --env GUARDIAN_AGENT_CREDENTIAL=your-value --env GUARDIAN_CONNECTION_ID=your-value --env GUARDIAN_ADAPTER_ID=your-value -- npx -y @odingard/guardian-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": {
    "guardian": {
      "command": "npx",
      "args": [
        "-y",
        "@odingard/guardian-mcp"
      ],
      "env": {
        "GUARDIAN_BASE_URL": "your-value",
        "GUARDIAN_AGENT_CREDENTIAL": "your-value",
        "GUARDIAN_CONNECTION_ID": "your-value",
        "GUARDIAN_ADAPTER_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": {
    "guardian": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@odingard/guardian-mcp"
      ],
      "env": {
        "GUARDIAN_BASE_URL": "your-value",
        "GUARDIAN_AGENT_CREDENTIAL": "your-value",
        "GUARDIAN_CONNECTION_ID": "your-value",
        "GUARDIAN_ADAPTER_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

GUARDIAN_BASE_URL required env
Guardian control-plane base URL
GUARDIAN_AGENT_CREDENTIAL secret required env
Agent credential (gak_…)
GUARDIAN_CONNECTION_ID required env
Default tool connection id for invocations
GUARDIAN_ADAPTER_ID env
Optional adapter override

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 Odingard, 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 32537 servers in this category
Published to the registry more recently than 95% of the other 32537 servers in this category
Basic checks equal to or better than 100% of the other 32537 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 Guardian 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?

You need to fill in: GUARDIAN_BASE_URL, GUARDIAN_AGENT_CREDENTIAL, GUARDIAN_CONNECTION_ID

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 (0.3.2) reached the registry 2 days 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, TF Rooms

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.

@odingard/guardian-mcp

MCP server that routes an agent's tool calls through Guardian — Human Authority Infrastructure for Autonomous AI. Every tool call gets a deterministic ALLOW / ASK / DENY decision before anything executes; DENY means the action never runs, and ASK holds it until a human approves.

Install

npm i -g @odingard/guardian-mcp

Configure your MCP client

"mcpServers": { "guardian": { "command": "guardian-mcp", "env": { "GUARDIAN_BASE_URL": "https://guardian-api.odingard.com", "GUARDIAN_AGENT_CREDENTIAL": "gak_…", "GUARDIAN_CONNECTION_ID": "con_…" } } } }

GUARDIAN_ADAPTER_ID optionally overrides the tool adapter.

Tools

Tool	What it does
`guardian_invoke_tool`	Propose a tool call. ALLOW executes and returns the receipt; ASK returns a `requestId` held for human approval; DENY refuses with a reason code.
`guardian_claim`	Claim an approved ASK by `requestId`, execute, return the receipt.
`guardian_receipt`	Fetch the machine-readable evidence receipts for a request.

Nothing executes without a Guardian capability — the model's output is a proposal, never an action.

Govern an existing MCP server: `guardian-mcp proxy` (0.3)

Put Guardian in front of any stdio MCP server you already use, such as WhatsApp, Stripe, Shopify, a filesystem or a database. The client sees the upstream server's tools unchanged, and every call is decided first:

"mcpServers": { "whatsapp-governed": { "command": "guardian-mcp", "args": ["proxy", "--", "npx", "-y", "your-whatsapp-mcp-server"], "env": { "GUARDIAN_BASE_URL": "https://guardian-api.odingard.com", "GUARDIAN_AGENT_CREDENTIAL": "gac1.…", "GUARDIAN_CONNECTION_ID": "con_…", "WHATSAPP_TOKEN": "…" } } } }

Decision	What happens
ALLOW	The call is forwarded to the upstream server, then the capability is redeemed and the receipt recorded.
ASK	Nothing is forwarded. The exact call is held under a `requestId`; after a human approves, `guardian_claim` forwards exactly that call, once.
DENY	Nothing is forwarded, ever. The same applies if Guardian is unreachable.

guardian_claim and guardian_receipt are added to the tool list.
The upstream server never receives GUARDIAN_* settings, so it never sees the agent credential.
Decision-gated: an allowed call runs upstream before the capability is redeemed. A refusal at redemption is reported as an incident (localEffectRan: true), never as success.
First-run setup: in the Guardian console, connect a tool server and add each upstream tool as "My own code (record-only)". Then allow those tools for the agent.
Since 0.3.1 the proxy does not try to register tools itself.
GUARDIAN_AUTO_REGISTER=true turns that back on, but it is denied unless the agent's grant pins mcp.install.
When Guardian refuses, the result says what to fix.
Held calls live in the proxy process. Restarting the proxy drops them, and nothing is forwarded.

guardian-mcp --help prints usage. A missing setting prints a one-line message naming it instead of a stack trace.

See what you are about to govern: `guardian-mcp tools`

Before putting a server behind the proxy, list its tools along with a suggested Guardian mode for each. This needs no Guardian credential:

npx -y @odingard/guardian-mcp tools -- npx -y @modelcontextprotocol/server-filesystem ./data

Tool            Suggested     Why

read_file Allow server marks it read-only write_file Ask me first "write" may change something delete_branch Ask me first server marks it destructive createIssue Ask me first "create" may change something ⚠ name not accepted by Guardian

How the suggestions are made:

The server's own MCP annotations (readOnlyHint, destructiveHint) are used first.
Otherwise the tool's verb decides. get, list and search suggest Allow; everything else suggests Ask.

They are suggestions only: you set the real modes in the console. Tool names that break Guardian's naming rule are flagged, because every call to them would be denied. Add --json for machine-readable output.

License

Apache-2.0. Canonical development happens in the Odingard Guardian monorepo.

Guardian MCP

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

TF Rooms

README from the maker

@odingard/guardian-mcp

Install

Configure your MCP client

Tools

Govern an existing MCP server: guardian-mcp proxy (0.3)

See what you are about to govern: guardian-mcp tools

License

Govern an existing MCP server: `guardian-mcp proxy` (0.3)

See what you are about to govern: `guardian-mcp tools`