{
      "name": "cbam-precursor",
      "domain": "CBAM",
      "title": "CBAM Precursor Emissions Roll-Up",
      "description": "Precursor embedded-emissions aggregation incl. the 2028 scrap rule (ART-72) -> consignment embedded-emissions calculation (ART-69) -> Merkle integrity over the supplier data set (cry-04). Lets a complex-goods producer supply verifiable embedded emissions to its importer; pre-positions the downstream-180 scope extension.",
      "composer_url": "https://ainumbers.co/chaingraph/chains/cbam-precursor.html",
      "steps": [
        {
          "tool_id": "art-72-cbam-precursor-emissions-aggregator",
          "handoff": "cumulative precursor SEE (H1) feeds the emissions calculator"
        },
        {
          "tool_id": "art-69-cbam-embedded-emissions-calculator",
          "handoff": "consignment embedded emissions (H2) feed the verifier"
        },
        {
          "tool_id": "cry-04-merkle-batch-verifier",
          "handoff": "Exports composite precursor artifact with Merkle-root execution_hash (H3) -- final stage"
        }
      ]
    }