Countersign

Name: Countersign
Author: countersign-network

by countersign-networkversion 0.2.2i★ –iRuns on your computer

Registry nameio.github.countersign-network/countersign

Install

Overview

Description from the maker (original English)

Kill switch + spend guard for AI agents that spend money, across every wallet vendor at once.

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: COUNTERSIGN_URL, COUNTERSIGN_API_KEY

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: COUNTERSIGN_URL, COUNTERSIGN_API_KEY

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": {
    "countersign": {
      "command": "npx",
      "args": [
        "-y",
        "@countersign/mcp"
      ],
      "env": {
        "COUNTERSIGN_URL": "your-value",
        "COUNTERSIGN_API_KEY": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add countersign --env COUNTERSIGN_URL=your-value --env COUNTERSIGN_API_KEY=your-value -- npx -y @countersign/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": {
    "countersign": {
      "command": "npx",
      "args": [
        "-y",
        "@countersign/mcp"
      ],
      "env": {
        "COUNTERSIGN_URL": "your-value",
        "COUNTERSIGN_API_KEY": "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": {
    "countersign": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@countersign/mcp"
      ],
      "env": {
        "COUNTERSIGN_URL": "your-value",
        "COUNTERSIGN_API_KEY": "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

COUNTERSIGN_URL required env
Base URL of the Countersign Core to govern (hosted or self-hosted).
COUNTERSIGN_API_KEY secret required env
API key for the Core (self-serve one at https://app.countersign.network/start or POST /signup).

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 countersign-network, 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 32380 servers in this category
Published to the registry more recently than 29% of the other 32380 servers in this category
Basic checks equal to or better than 100% of the other 32380 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 Countersign 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: COUNTERSIGN_URL, COUNTERSIGN_API_KEY

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 (0.2.2) 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, Dechonet MCP

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.

@countersign/mcp

The cross-vendor kill switch + spend guard for AI agents — as MCP tools, inside any MCP client.

Countersign is a neutral control plane that holds one policy, one freeze, and one tamper-evident audit ledger across every agent-wallet backend at once. This package exposes it as Model Context Protocol tools, so an agent (or you, from chat in Claude / Cursor) can ask *"may I spend this?"* before acting — and freeze everything in under a second.

Tools

Tool	What it does
`countersign_request_spend`	Pre-flight guard — ask whether a spend is allowed before touching the wallet (allow / deny / needs_approval).
`countersign_freeze`	The kill switch — freeze every agent on every backend at once.
`countersign_apply_policy`	Apply one unified policy (caps, allow/deny lists, approval threshold) across all backends.
`countersign_list_agents` / `countersign_health`	See the governed fleet + control-plane health.
`countersign_list_approvals` / `countersign_approve` / `countersign_deny`	The human-approval queue.
`countersign_ledger`	Read + re-verify the append-only, hash-chained audit ledger.
`countersign_unfreeze`	Lift a freeze (recover).

Setup

It governs a running Countersign Core. The hosted Core at app.countersign.network is paused since 2026-09-18 and answers 503, so point this at a Core you run yourself. Set:

COUNTERSIGN_URL — your Core, e.g. https://app.countersign.network
COUNTERSIGN_API_KEY — required when the Core has auth enabled

Claude Desktop / Claude Code / Cursor

Add to your MCP config (claude_desktop_config.json, or claude mcp add, or Cursor's mcp.json):

"mcpServers": { "countersign": { "command": "npx", "args": ["-y", "@countersign/mcp"], "env": { "COUNTERSIGN_URL": "https://app.countersign.network", "COUNTERSIGN_API_KEY": "csk_…" } } } }

That's it — your agent now has the spend guard and the kill switch.

Show it (the "powered by" badge)

If Countersign guards your agent, say so — it tells users (and other agents) that spending is governed, and points the next operator at the same kill switch. Drop this in your README:

[![Spending governed by Countersign](https://img.shields.io/badge/spending%20governed%20by-Countersign-58e6a8?labelColor=0b1020)](https://countersign.network)

Listing in MCP registries (distribution)

Countersign spreads by being easy to discover wherever agent builders look for tools. The metadata below is ready to submit to the common registries — copy it as-is.

Official MCP registry (registry.modelcontextprotocol.io / the mcp-registry repo) — entry:

"name": "io.github.countersign-network/countersign", "description": "Cross-vendor kill switch + spend guard for AI agents that spend money — one policy, one freeze, one tamper-evident ledger across every wallet/card backend.", "homepage": "https://countersign.network", "repository": "https://github.com/countersign-network/countersign", "packages": [ { "registry": "npm", "name": "@countersign/mcp", "runtime": "npx" } ], "license": "Apache-2.0" }

- **[mcp.so](https://mcp.so)** — submit `@countersign/mcp`; category *Finance / Security / Agents*.

[Smithery](https://smithery.ai) — npx-launched server; env COUNTERSIGN_URL (default https://app.countersign.network) + optional COUNTERSIGN_API_KEY.
awesome-mcp-servers lists — one-liner:

[Countersign](https://github.com/countersign-network/countersign) — cross-vendor spend guard + sub-second kill switch + tamper-evident ledger for AI agents that move money (Coinbase, Turnkey, Openfort, Visa card). Testnet.

Standard listing fields:

Field	Value
Server id	`countersign`
Launch	`npx -y @countersign/mcp`
Tools	`countersign_request_spend`, `countersign_freeze`, `countersign_apply_policy`, `countersign_list_agents`, `countersign_health`, `countersign_list_approvals`, `countersign_approve`, `countersign_deny`, `countersign_ledger`, `countersign_unfreeze`
Tags	`payments` · `security` · `kill-switch` · `spend-guard` · `agent-payments` · `wallet`

Nothing here is auto-submitted — listings are made deliberately by a maintainer.

Apache-2.0. Countersign holds policy/freeze/ledger; it never takes custody of funds. Testnet only.

Countersign

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

Dechonet MCP

README from the maker

@countersign/mcp

Tools

Setup

Claude Desktop / Claude Code / Cursor

Show it (the "powered by" badge)

Listing in MCP registries (distribution)