{
      "tool_id": "art-324-tvm-npv",
      "tool_version": "1.0.0",
      "display_name": "Net Present Value (NPV)",
      "mcp_name": "compute_npv",
      "mandate_type": "analytics_mandate",
      "wave": 57,
      "gpu": false,
      "url": "https://ainumbers.co/chaingraph/art-324-tvm-npv.html",
      "description": "Net present value of a cash flow series, discounted at a declared periodic rate. Accepts either caller-supplied period offsets or dated cash flows converted to years under a declared day-count convention (30/360, ACT/360, ACT/365, or a simplified ACT/ACT). Deterministic pow via Taylor-series exp/ln, no engine transcendentals. Foundation primitive for downstream valuation and lease/loan analytics.",
      "input_schema_ref": "chaingraph/art-324-tvm-npv.html#manifest",
      "consumes": [],
      "feeds": [],
      "status": "live",
      "conformance_fixtures": true,
      "compute_capability": "server",
      "compute_images": [{"system":"sha256-source","image_id":"sha256:73ed269fd294aec7d9ff692c40383f59d38689eac424726d8c135c52ff8c78a2","valid_from":"2026-07-10"},{"system":"risc0","image_id":"sha256:a1a0bc89b5b1febaeda3519f6dbade0fa5ac16beeb143c4e1b01689573567bc6","valid_from":"2026-07-16"}],
      "export_capability": [
        "json"
      ],
      "compute_proof_ready": "ready",
      "compute_proof": {
        "type": "ZkVmReceipt",
        "system": "risc0",
        "receiptFormat": "groth16-bn254",
        "imageId": "sha256:a1a0bc89b5b1febaeda3519f6dbade0fa5ac16beeb143c4e1b01689573567bc6",
        "seal": "JcZ/mqytJtBb7GWrfCV+nmpzM63UscAIEkKTVh68pIEO55N7C9WyE3x2pIEitOLWeo9Y4UbxaiPI/QXYeWPIyi+tEh02bTnLOCHLin3kp8diTNmUxzzcdfm9A1+nvzD2FWCFL9fCv/T/PWUF5eL2RTsE0IvOqO+/UCH1u6yBbVssm5YP0/bRHC4Ztf8Un/nomKFiSykk4e0j+wr+sQ54ESaZs0Vz4bZlHTs+8pKdlS8a6IdUsqdUnmhHCfMPq/r4IIeA+vfJB/Wi6o52MAhuMCCGFk0+5185ZYuyzFqrojQLeHoZnB6lwlCM7PJXfUesCUJ3jNcUv1xa6Vm6fQ47gw==",
        "journal": {
          "chaingraph_version": "0.4.0",
          "kernel_digest": "sha256:73ed269fd294aec7d9ff692c40383f59d38689eac424726d8c135c52ff8c78a2",
          "output": {
            "day_count_convention": "n/a (periods mode — t supplied directly)",
            "discount_rate_pct": 10,
            "mode": "periods",
            "note": "NPV = sum(CF_t / (1+r)^t). Periods mode: t is a caller-supplied period offset in the rate's own unit. Dates mode: t derived via declared day_count_convention (30/360, ACT/360, ACT/365, ACT/ACT-simplified) from valuation_date. Deterministic pow via Taylor-series exp/ln, no engine transcendentals.",
            "npv": -5.26,
            "num_cash_flows": 4,
            "regulatory_basis": "Standard discounted cash flow NPV, textbook definition (Brealey/Myers Ch.2)",
            "total_undiscounted": 200
          }
        }
      }
    }