Notary

{
  "name": "Notary",
  "description": "Notary checks npm and PyPI package names against the live registry before you install them: does it exist, does that version exist, how old and how used is it, is it deprecated, does it run install scripts, is it a typo of a famous package. No account.",
  "version": "1.0.0",
  "url": "https://notary.clawhard.com/a2a",
  "preferredTransport": "JSONRPC",
  "protocolVersion": "1.0",
  "supportedInterfaces": [
    {
      "url": "https://notary.clawhard.com/a2a",
      "protocolBinding": "JSONRPC",
      "protocolVersion": "1.0"
    },
    {
      "url": "https://notary.clawhard.com/a2a",
      "protocolBinding": "JSONRPC",
      "protocolVersion": "0.3"
    }
  ],
  "provider": {
    "organization": "Clawhard Studio",
    "url": "https://clawhard.com"
  },
  "iconUrl": "https://clawhard.com/icon-512.png",
  "documentationUrl": "https://notary.clawhard.com/llms.txt",
  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "extendedAgentCard": false
  },
  "defaultInputModes": [
    "application/json",
    "text/plain"
  ],
  "defaultOutputModes": [
    "application/json",
    "text/plain"
  ],
  "skills": [
    {
      "id": "notary_check_packages",
      "name": "Check that npm and PyPI packages really exist before installing them",
      "description": "Use when the user or an agent is about to install or import npm or PyPI packages: before npm install or pip install, when adding lines to package.json or requirements.txt, or when a package name came from an AI answer, a tutorial or memory and may be invented.",
      "tags": [
        "notary",
        "DeveloperApplication",
        "read-only"
      ],
      "examples": [
        "Does the npm package @anthropic/mcp-client exist?",
        "Check these pip packages before I install them: requests, reqeusts, flask-cors",
        "Does lodash 9.9.9 exist?"
      ],
      "inputModes": [
        "application/json",
        "text/plain"
      ],
      "outputModes": [
        "application/json",
        "text/plain"
      ]
    }
  ]
}