A local-first Model Context Protocol server for HSM Kit. It exposes small, deterministic tools for encoding, check digits, key-component tests, and synthetic payment test data.

Run

npx -y @hsmkit/mcp-server

Claude Desktop example:

{
  "mcpServers": {
    "hsmkit": {
      "command": "npx",
      "args": ["-y", "@hsmkit/mcp-server"]
    }
  }
}

Tools

luhn_calculate_check_digit
luhn_validate
xor_key_components
iso0_pin_block
base64_encode
base64_decode

Each result includes a related https://hsmkit.com/ documentation URL. The server uses stdio, makes no network requests, and does not log tool inputs.

Security boundary

Use synthetic test data only. AI clients may retain prompts or tool arguments independently of this server. Never submit production keys, real PINs, credentials, personal information, or live payment data.

Source: https://github.com/hsm-kit/hsmkit/tree/main/packages/mcp-server
Issues: https://github.com/hsm-kit/hsmkit/issues