Countersign

{
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
  "name": "io.github.countersign-network/countersign",
  "description": "Kill switch + spend guard for AI agents that spend money, across every wallet vendor at once.",
  "title": "Countersign",
  "repository": {
    "url": "https://github.com/countersign-network/packages",
    "source": "github",
    "subfolder": "packages/mcp"
  },
  "version": "0.2.2",
  "websiteUrl": "https://countersign.network",
  "packages": [
    {
      "registryType": "npm",
      "registryBaseUrl": "https://registry.npmjs.org",
      "identifier": "@countersign/mcp",
      "version": "0.2.2",
      "runtimeHint": "npx",
      "transport": {
        "type": "stdio"
      },
      "environmentVariables": [
        {
          "description": "Base URL of the Countersign Core to govern (hosted or self-hosted).",
          "isRequired": true,
          "format": "string",
          "default": "https://app.countersign.network",
          "name": "COUNTERSIGN_URL"
        },
        {
          "description": "API key for the Core (self-serve one at https://app.countersign.network/start or POST /signup).",
          "isRequired": true,
          "format": "string",
          "isSecret": true,
          "name": "COUNTERSIGN_API_KEY"
        }
      ]
    }
  ],
  "_meta": {
    "io.modelcontextprotocol.registry/publisher-provided": {
      "categories": [
        "finance",
        "security"
      ],
      "license": "Apache-2.0",
      "summary": "Countersign is a neutral, cross-vendor control plane for AI agents that spend money. It holds one policy, one sub-second freeze (kill switch), and one tamper-evident audit ledger across multiple agent-wallet and card backends at once. Remote mode: set COUNTERSIGN_URL + COUNTERSIGN_API_KEY against a hosted or self-hosted Core. Testnet only; Countersign never takes custody of funds.",
      "tags": [
        "payments",
        "agent-payments",
        "security",
        "kill-switch",
        "spend-guard",
        "wallet",
        "ledger",
        "governance"
      ],
      "tools": [
        "countersign_request_spend",
        "countersign_freeze",
        "countersign_unfreeze",
        "countersign_apply_policy",
        "countersign_list_agents",
        "countersign_health",
        "countersign_list_approvals",
        "countersign_approve",
        "countersign_deny",
        "countersign_ledger",
        "countersign_guard_x402",
        "countersign_guard_ap2"
      ]
    }
  }
}