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mcp/harbor
Claude Desktop

Countersign for Claude Desktop

io.github.countersign-network/countersign

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

client:Claude Desktop transport:stdio runtime:npm

Install Countersign in Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json · windows: %APPDATA%\Claude\claude_desktop_config.json

Held in this page only — never stored, logged, or sent anywhere but back to your screen. 

{
  "mcpServers": {
    "countersign": {
      "command": "npx",
      "args": [
        "-y",
        "@countersign/mcp"
      ],
      "env": {
        "COUNTERSIGN_URL": "<COUNTERSIGN_URL>",
        "COUNTERSIGN_API_KEY": "<COUNTERSIGN_API_KEY>"
      }
    }
  }
}

Settings → Developer → Edit Config opens this file. Restart the app after saving. Claude Desktop docs

Countersign in other clients

Countersign MCP server