Ar Agents MCP

Name: Ar Agents MCP
Author: ar-agents

by ar-agentsversion 0.4.11i★ –iRuns on your computer

Registry nameio.github.ar-agents/mcp

Install

Overview

Description from the maker (original English)

Argentine business automation: Mercado Pago, AFIP/ARCA, WhatsApp, banking, shipping (7 packages).

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: Accounting, finance & tax
You need to fill in: MP_ACCESS_TOKEN, AFIP_CERT_PEM, AFIP_KEY_PEM, WHATSAPP_ACCESS_TOKEN

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: MP_ACCESS_TOKEN, AFIP_CERT_PEM, AFIP_KEY_PEM, AFIP_CUIT, WHATSAPP_ACCESS_TOKEN, WHATSAPP_PHONE_NUMBER_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": {
    "ar-agents": {
      "command": "npx",
      "args": [
        "-y",
        "@ar-agents/mcp"
      ],
      "env": {
        "MP_ACCESS_TOKEN": "your-value",
        "AFIP_CERT_PEM": "your-value",
        "AFIP_KEY_PEM": "your-value",
        "AFIP_CUIT": "your-value",
        "WHATSAPP_ACCESS_TOKEN": "your-value",
        "WHATSAPP_PHONE_NUMBER_ID": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add ar-agents --env MP_ACCESS_TOKEN=your-value --env AFIP_CERT_PEM=your-value --env AFIP_KEY_PEM=your-value --env AFIP_CUIT=your-value --env WHATSAPP_ACCESS_TOKEN=your-value --env WHATSAPP_PHONE_NUMBER_ID=your-value -- npx -y @ar-agents/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": {
    "ar-agents": {
      "command": "npx",
      "args": [
        "-y",
        "@ar-agents/mcp"
      ],
      "env": {
        "MP_ACCESS_TOKEN": "your-value",
        "AFIP_CERT_PEM": "your-value",
        "AFIP_KEY_PEM": "your-value",
        "AFIP_CUIT": "your-value",
        "WHATSAPP_ACCESS_TOKEN": "your-value",
        "WHATSAPP_PHONE_NUMBER_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": {
    "ar-agents": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@ar-agents/mcp"
      ],
      "env": {
        "MP_ACCESS_TOKEN": "your-value",
        "AFIP_CERT_PEM": "your-value",
        "AFIP_KEY_PEM": "your-value",
        "AFIP_CUIT": "your-value",
        "WHATSAPP_ACCESS_TOKEN": "your-value",
        "WHATSAPP_PHONE_NUMBER_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

MP_ACCESS_TOKEN secret env
Mercado Pago access token (TEST- prefix for sandbox, APP_USR- for production). Enables MP tools.
AFIP_CERT_PEM secret env
AFIP/ARCA X.509 certificate (PEM string) for WSAA authentication. Enables CUIT padron + factura electronica tools.
AFIP_KEY_PEM secret env
AFIP/ARCA private key (PEM string) for WSAA authentication. Required if AFIP_CERT_PEM is set.
AFIP_CUIT env
Issuer CUIT (Argentine tax ID) registered with the AFIP cert. Format: 20-XXXXXXXX-X.
WHATSAPP_ACCESS_TOKEN secret env
Meta WhatsApp Business Cloud API token. Enables WhatsApp tools.
WHATSAPP_PHONE_NUMBER_ID env
Meta WhatsApp Business phone-number ID. Required if WHATSAPP_ACCESS_TOKEN is set.

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 ar-agents, 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 Accounting, finance & taxi

More stars than 0% of the other 1722 servers in this category
Published to the registry more recently than 8% of the other 1722 servers in this category
Basic checks equal to or better than 100% of the other 1722 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 Ar Agents 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: MP_ACCESS_TOKEN, AFIP_CERT_PEM, AFIP_KEY_PEM, WHATSAPP_ACCESS_TOKEN

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 (0.4.11) 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: Finance Toolkit, SolidInvoice, Korea Tax Calculator

Alternatives

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

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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.

@ar-agents/mcp

One MCP server that bundles the entire @ar-agents/* toolkit: CUIT validation, AFIP/ARCA padron lookup, identity attestation, MercadoPago Payments + Subscriptions + Cuotas, WhatsApp Business: into any MCP host (Claude Desktop, Cursor, Codeium, Continue, Cline, etc.).

What is this

This package is the MCP server wrapper around the @ar-agents/* packages. If you're building agents in Vercel AI SDK 6 directly, you don't need this: install the individual packages. If you want to use the AR toolkit from Claude Desktop, Cursor, Codeium, or any MCP host, this is your one-stop install.

Governance: the art. 102 gate is ON by default

This server moves real money (Mercado Pago), files real taxes (AFIP/ARCA) and can constitute real companies (IGJ). Argentina's Sociedad Automatizada regime (art. 102) makes a human administrator responsible for those acts and bars delegating that supervision. So, by default, this server enforces a governance gate:

A `READ`-level tool (e.g. validate_cuit, lookup_cuit_afip, search_payments) always runs: no gate.
A money / fiscal / legal / irreversible (or unclassifiable) tool is REFUSED unless you wire a human-approval hook. The refusal is a clear MCP error telling you what to do — no money/fiscal/legal tool ever executes silently.

Classification reuses the same @ar-agents/core risk manifest the local agents use (classifyTool / levelRequiresApproval), fed each tool's name, description and sideEffects. The gate runs before the tool executes, so a denied call never touches the network.

Blast radius: the gate is fail-closed, so some READ tools are gated too

Classification is by name (plus description / sideEffects). The unknown class fails closed — and any tool whose name is not a recognized read verb is treated as `unknown` and is GATED by default-ON. With every registry wired this is roughly 65 of ~145 exposed tools, and it currently includes some genuine read tools whose names don't match the read-verb heuristic:

Category	Read tools currently GATED by default-ON
IGJ registry reads	`igj_get_entity`, `igj_search_entities`, `igj_get_autoridades`, `igj_get_domicilios`, `igj_get_asambleas`
Boletín Oficial reads	`bo_search`, `bo_today`, `bo_get_norma`, `bo_list_subscriptions`
Signature verification reads	`firma_inspect_cert`, `firma_verify_chain`, `firma_verify_cms_signature`, `firma_is_onti_issued`
AFIP catalog reads	`obtener_alicuotas_iva`, `obtener_tipos_comprobante`, `obtener_tipos_documento`, `obtener_tipos_concepto`, `obtener_tipos_moneda`
Shipping reads	`trackear_envio`, `listar_sucursales`
Other	`lookup_credit_situation`, `mp_health_check`

This is intentional fail-safe behavior (better to gate a read than let an unknown tool move money silently), not a per-tool allowlist of "these are dangerous". To see the exact resolved risk level for every tool in your configuration, run:

ar-agents-mcp doctor

Its GOVERNANCE section lists each exposed tool, its resolved risk level, and whether it is GATED under your current env — so you see the precise blast radius before and after upgrading. To let the gated reads (and any approval-level tool) run, either wire an approve hook (below) or set `AR_AGENTS_MCP_ENFORCE=off` (ungated — not recommended for autonomous money/fiscal/legal acts). Reclassifying these names as read so they pass while real acts stay gated is a separate, deliberate change to the cross-package risk manifest, tracked outside this release.

Wiring human approval (HITL)

When you embed the server in your own Node app:

import { createServer } from "@ar-agents/mcp";

const { server } = await createServer({ governance: { // Called before any money/fiscal/legal/irreversible/unknown tool. // Return true to proceed, false (or throw) to refuse. approve: async (toolName, args) => askHumanAdministrator(toolName, args), // Optional kill-switch: when it returns true, EVERY tool refuses. isHalted: async () => isSocietySuspended(), }, });

Opting out (ungated passthrough)

To restore the old behavior where every tool runs without a gate, set:

"env": { "AR_AGENTS_MCP_ENFORCE": "off" }

Resolution order: the explicit createServer({ governance: { enforce } }) option > the AR_AGENTS_MCP_ENFORCE env var > default-ON. The boot summary (printed to stderr) shows the active mode, e.g. governance → enforce=ON (art. 102 gate · NO approve hook → fail-closed DENY).

Kill-switch

Set AR_AGENTS_MCP_HALT=1 (or wire governance.isHalted) to suspend the whole society: every tool, read or not, refuses with a society_suspended error. Default is no halt — behavior is unchanged unless you wire it.

Env var	Default	Effect
`AR_AGENTS_MCP_ENFORCE`	on	`off` disables the art. 102 gate (ungated passthrough).
`AR_AGENTS_MCP_HALT`	unset	`1` suspends every tool (`society_suspended`).

Quick start (Claude Desktop)

Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

"mcpServers": { "ar-agents": { "command": "npx", "args": ["-y", "@ar-agents/mcp"], "env": { // All env vars are optional: set the ones for the integrations you need. // Without any: only validate_cuit (algorithm-only) is available.

// MercadoPago: enables 21 payment / subscription tools "MP_ACCESS_TOKEN": "TEST-...-or-APP_USR-...", "MP_BACK_URL": "https://yourapp.com/done",

// AFIP/ARCA: enables lookup_cuit_afip (real padron data) "AFIP_CUIT_REPRESENTADO": "20XXXXXXXXY", "AFIP_CERT_PEM": "-----BEGIN CERTIFICATE-----\n...", "AFIP_KEY_PEM": "[PopNx MCP ตัดค่าที่หน้าตาเหมือนกุญแจออก]

Ar Agents 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 Accounting, finance & taxi

Common questions

Alternatives

Finance Toolkit

SolidInvoice

Korea Tax Calculator

README from the maker

@ar-agents/mcp

What is this

Governance: the art. 102 gate is ON by default

Blast radius: the gate is fail-closed, so some READ tools are gated too

Wiring human approval (HITL)

Opting out (ungated passthrough)

Kill-switch

Quick start (Claude Desktop)