Agent Purchase Guard — A2A paper access test

{
  "name": "Agent Purchase Guard \u2014 A2A paper access test",
  "description": "Deterministic paper-only purchase preflight. Send one JSON purchase intent as an A2A text part. No payment, wallet, signature, credential or live commerce.",
  "version": "a2a-shadow-1.0",
  "documentationUrl": "https://merchant-scout-purchase-guard-a2a.malcolmscott73.workers.dev/capabilities",
  "supportedInterfaces": [
    {
      "url": "https://merchant-scout-purchase-guard-a2a.malcolmscott73.workers.dev/",
      "protocolBinding": "JSONRPC",
      "protocolVersion": "1.0"
    }
  ],
  "capabilities": {
    "streaming": false,
    "pushNotifications": false
  },
  "defaultInputModes": [
    "text/plain",
    "application/json"
  ],
  "defaultOutputModes": [
    "text/plain"
  ],
  "skills": [
    {
      "id": "paper_purchase_preflight",
      "name": "Paper purchase preflight",
      "description": "Submit a JSON object as the entire message text. Required: agent_id, session_id, payment_id, scheme=exact, network=mock or eip155:84532, asset=PAPER_USDC or TEST_USDC, amount_usd, max_amount_usd, pay_to, resource_url, method and operation_id. Include your public HTTPS agent_card_url for separate operator review. price_accepted and accepted_price_usd are non-binding signals. Never send secrets or payment material.",
      "tags": [
        "paper-commerce",
        "purchase-safety",
        "preflight"
      ],
      "examples": [
        "{\"agent_id\":\"example-agent\",\"session_id\":\"example-session\",\"agent_card_url\":\"https://agent.example/.well-known/agent-card.json\",\"payment_id\":\"paper-example-0001\",\"scheme\":\"exact\",\"network\":\"mock\",\"asset\":\"PAPER_USDC\",\"amount_usd\":0.03,\"max_amount_usd\":0.05,\"pay_to\":\"paper:example\",\"resource_url\":\"https://service.example/data\",\"method\":\"POST\",\"operation_id\":\"example-data\",\"price_accepted\":false,\"accepted_price_usd\":0}"
      ],
      "inputModes": [
        "text/plain",
        "application/json"
      ],
      "outputModes": [
        "text/plain"
      ]
    }
  ]
}