{
  "tool_id": "art-43-arc-cpn-model",
  "mcp_name": "model_arc_cpn_economics",
  "policy_parameters": {
    "rail": "swift",
    "notional_usd": 10000,
    "monthly_volume": 200,
    "impl_months": 3
  },
  "_fixture_note": "SWIFT $10k, 200 tx/month, 3-month impl. Per-tx incumbent: $18 + $10 (0.1%) + $150 (150bps FX) = $178. CPN: $0.01. Annual saving $427,176. Break-even ~1 month. Verdict: MIGRATE.",
  "expected_output_payload": {
    "verdict": "MIGRATE",
    "rail": "swift",
    "compliance_flags": [
      "ARC_CPN_MIGRATION_RECOMMENDED",
      "PFMI_P4_FX_COST_HIGH"
    ]
  },
  "expected_execution_hash": "sha256:629628322888a13f0be7f5738aae883d38c10ea5e52df806fef34bef1d121b7f"
}