{
      "name": "agentic-rail",
      "domain": "AI & Agent Governance",
      "title": "Agentic Rail Chain",
      "description": "Agentic payments protocol comparison > AP2 mandate > Visa TAP signature inspection > Mastercard agentic token scope > A2A agent card validation > x402 payload decode > x402 settlement modelling > MCP developer readiness scorecard. The composer page routes the comparator into a card branch and an A2A branch that converge on the readiness scorecard; the chain records that run in the linear order the page renders, because a chain has no branch construct. The sibling chain agentic-rail-standards is the standards-only check over the card-network token specifications and shares no step with this one: this chain runs the protocol end to end, that one checks conformance with the published standards.",
      "composer_url": "https://ainumbers.co/chaingraph/chains/agentic-rail.html",
      "regulatory_basis_status": "not_assessed",
      "regulatory_basis_decided_by": "CHAINS-COMPOSE-MISSING-3-1",
      "regulatory_basis_decided_at": "2026-09-25",
      "steps": [
        {
          "tool_id": "art-22-agentic-payments-protocol-comparator",
          "handoff": "Root — routes to Branch A (AP2/Card) or Branch B (A2A/x402); converges at ART-18"
        },
        {
          "tool_id": "art-16-google-ap2-mandate-builder",
          "handoff": "Branch A A1 — AP2 payment mandate; feeds ART-23 Visa TAP"
        },
        {
          "tool_id": "art-23-visa-trusted-agent-protocol-inspector",
          "handoff": "Branch A A2 — Visa TAP compliance control; feeds ART-24"
        },
        {
          "tool_id": "art-24-mastercard-agentic-token-builder",
          "handoff": "Branch A A3 terminal — Mastercard agentic token scope; then ART-18"
        },
        {
          "tool_id": "art-25-a2a-agent-card-validator",
          "handoff": "Branch B B1 — A2A agent card compliance; feeds ART-26"
        },
        {
          "tool_id": "art-26-x402-payload-decoder-flow-simulator",
          "handoff": "Branch B B2 — x402 payload decode and lint; feeds ART-03"
        },
        {
          "tool_id": "art-03-x402-settlement-modeler",
          "handoff": "Branch B B3 terminal — x402 settlement cost and finality; then ART-18"
        },
        {
          "tool_id": "art-18-mcp-developer-readiness-scorecard",
          "handoff": "Terminal — both branches converge; final agentic-rail compliance mandate"
        }
      ]
    }