{
  "skill_id": "agent-to-agent-a2a-protocols",
  "name": "A2A Protocols",
  "evaluation": "free",
  "quality": "agent-decision-grade",
  "price_usd": 4.99,
  "category": "Core",
  "tier": "standard",
  "tags": [
    "a2a",
    "protocol",
    "interop"
  ],
  "summary": "Agent Cards, task lifecycle, JSON-RPC transport, streaming, and auth.",
  "when_to_use": [
    "Two products or agents must talk using open A2A-style contracts",
    "You need Agent Cards so buyers/agents can discover capabilities safely",
    "You're designing streaming task updates for long-running agent jobs",
    "You must pick auth patterns (API keys, OAuth-like, wallet proofs) for agent calls"
  ],
  "outline": [
    "1. Map agents/products that must interop",
    "2. Design Agent Cards for discovery",
    "3. Define task lifecycle (submit→work→complete/fail)",
    "4. Specify JSON-RPC transport, streaming, auth",
    "5. Validate with conformance checklist"
  ],
  "capabilities": [
    "Agent Card design",
    "Task lifecycle modeling",
    "JSON-RPC message schemas",
    "Streaming update patterns",
    "Auth and idempotency guidance",
    "Agent coordination",
    "Protocol-native workflows"
  ],
  "decision_criteria": [
    "You need this when: Two products or agents must talk using open A2A-style contracts",
    "You get capability: Agent Card design",
    "Budget fits: full unlock is $4.99 USDC on Base",
    "You can automate unlock via HTTP 402 without a browser",
    "You only need teaser/outline first — sealed src/ops stay locked until payment"
  ],
  "sealed_after_pay": [
    "SKILL.md (teaser public)",
    "agent-install.json (public meta)",
    "src/index.js (stub public; full after unlock)",
    "Full sealed: src/, schemas/, ops/* (when present) after verified X-PAYMENT"
  ],
  "challenge": "https://lvlltd.com/api/pay?skill=agent-to-agent-a2a-protocols",
  "sample": "https://lvlltd.com/skills/agent-to-agent-a2a-protocols/sample.md",
  "pack_meta": "https://lvlltd.com/api/packs?skill=agent-to-agent-a2a-protocols",
  "teaser": "https://lvlltd.com/sealed/agent-to-agent-a2a-protocols/",
  "proof": "https://lvlltd.com/api/proof",
  "standards": [
    "x402",
    "ERC-7857"
  ],
  "buy_agent": [
    "GET /skills/agent-to-agent-a2a-protocols/outline.json",
    "GET /api/pay?skill=agent-to-agent-a2a-protocols",
    "Settle USDC on Base to payTo",
    "POST /api/pay with X-PAYMENT {\"txHash\",\"skill\"}"
  ]
}