CBAM Precursor Certificate Liability Check

Price a complex good in CBAM certificates in three independent runs plus a session receipt: roll up precursor emissions for a declared final good and quantity (ART-72), calculate consignment embedded emissions from declared direct data and a declared precursor total (ART-69), then model the certificate liability, holding schedule and surrender deadline from the declared embedded total (ART-71), closing with a session receipt aggregating the run execution hashes (CRY-05). Each run computes from its own declared inputs. This chain is decision support, not a filed CBAM declaration, not a verification, and not a surrender of certificates.

OpenChainGraph · 4 Steps cryptographic mandate Hash-Anchored §4 chain_depth:4 Client-Side · Zero PII

Chain Stages · 4 Steps

1 ROOT node

CBAM Precursor-Emissions Aggregator art-72-cbam-precursor-emissions-aggregator

Rolls up embedded emissions across declared precursors for a declared final good and quantity, with a per-precursor breakdown, a mass-fraction total, and a data quality grade. The 2028 pre-consumer-scrap rule is applied only when a scrap input share is declared, and its credit modelling is a preliminary approximation to verify against final text.

MCP Call · aggregate_cbam_precursor_emissions

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "aggregate_cbam_precursor_emissions",
    "arguments": {}
  },
  "id": 1
}

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2 STAGE 2 node

CBAM Embedded-Emissions Calculator art-69-cbam-embedded-emissions-calculator

Calculates consignment embedded emissions from declared direct and indirect data, a declared good category, country of origin and quantity, plus a declared precursor total cited from the step 1 run. The run states its emissions basis as actual or default in its own record, and its indirect component uses the kernel built-in factor described on the chain page.

MCP Call · calculate_cbam_embedded_emissions

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "calculate_cbam_embedded_emissions",
    "arguments": {}
  },
  "id": 1
}

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3 STAGE 3 node

CBAM Certificate Cost & Free-Allocation Engine art-71-cbam-certificate-cost-engine

Models certificate liability from a declared embedded total, a declared factor year, declared EUA prices and a declared origin carbon price, with a de minimis screen, a quarterly holding schedule, a purchase window and a surrender deadline. The 2026 vintage uses quarterly-average-of-quarter-of-importation pricing; weekly closing-average pricing applies from 2027 onward. Repurchase and cancellation are not modelled by this step.

MCP Call · model_cbam_certificate_cost

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "model_cbam_certificate_cost",
    "arguments": {}
  },
  "id": 1
}

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4 TERMINAL node

Agent-Action Audit-Trail Aggregator cry-05-agent-action-audit-trail-aggregator

Produces session_receipt_root, the Merkle root over the run execution hashes (final stage)

MCP Call · aggregate_execution_receipts

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "aggregate_execution_receipts",
    "arguments": {}
  },
  "id": 1
}

Question: What does this complex good cost in CBAM certificates, on declared inputs? Run the AINumbers MCP tool `run_chain` with {"chain":"cbam-precursor-certificate-liability-check"} and read `art-71-cbam-certificate-cost-engine.certificates_required`. Re-run with `inputs` for `art-71-cbam-certificate-cost-engine`, reusing the values that result echoed, with `eua_reference_price` changed so the EUA reference price is higher. Compare the same field. Verify: call `verify_execution_hash` (https://mcp.ainumbers.co/mcp) with `claimed_hash` set to `composite_execution_hash` and the full `composite_artifact`. Ledger, for a human re-check: https://ledger.ainumbers.co/ PII rule: send synthetic or anonymised inputs only. The MCP server runs these kernels and logs no payloads. Chain page: https://ainumbers.co/chaingraph/chains/cbam-precursor-certificate-liability-check.html

CBAM Precursor Certificate Liability Check

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