{
      "tool_id": "art-326-tvm-xirr",
      "tool_version": "1.0.0",
      "display_name": "XIRR (Irregular Dated Cash Flows)",
      "mcp_name": "compute_xirr",
      "mandate_type": "analytics_mandate",
      "wave": 57,
      "gpu": false,
      "url": "https://ainumbers.co/chaingraph/art-326-tvm-xirr.html",
      "description": "Annualized rate of return for irregular-interval dated cash flows, matching Excel XIRR semantics exactly: fixed actual/365 day count, anchored to the first cash flow date, solved by deterministic bisection over a declared rate bracket. Companion to compute_irr for cash flows that do not fall on equal periods.",
      "input_schema_ref": "chaingraph/art-326-tvm-xirr.html#manifest",
      "consumes": [],
      "feeds": [],
      "status": "live",
      "conformance_fixtures": true,
      "compute_capability": "server",
      "compute_images": [{"system":"sha256-source","image_id":"sha256:3248ec11b6d575a1795556fc220cc80b0f59b917cf7753117589a66df18b53a6","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": "JMmDe3iKBFmO5M1Skj2OV8lfsWU1OKb6BGE8y3aEY10WR0WBBlBCwt5aCdcLRid+v81N2wsmv8rnm2Jk7fLhQiNdI7u+WOVEcOFwBY3aSUMMaWlrA7CGkgMy2BI14TVKH1Vx4ACsH81Fw2/8x5IGjzG7bSrEWphxtRcKsbyKpa8FD3ge9zcI3IRfB5ylLgx+chdpzmIq/nXUZS8TTCWL0hbc0KuFHENQvqT3T2nCB6OijMqQvbLbRN1/8pImbocFH4XfFspXvPh3twNvotFAywkkyWb/91tI9glNuwwayFwMCtrZ2XC2iWDdip59X+iBs7fVHyOey8Bp9ysD/K7v/w==",
        "journal": {
          "chaingraph_version": "0.4.0",
          "kernel_digest": "sha256:3248ec11b6d575a1795556fc220cc80b0f59b917cf7753117589a66df18b53a6",
          "output": {
            "anchor_date": "2008-01-01",
            "bracket_hi_pct": 1000,
            "bracket_lo_pct": -99.99,
            "converged": true,
            "day_count_convention": "ACT/365",
            "iterations": 34,
            "method": "bisection",
            "note": "XIRR solved by deterministic bisection over the declared [bracket_lo, bracket_hi] rate bracket. Day count is fixed at actual/365 per Excel/1004 semantics (not caller-configurable, matching the published XIRR definition exactly). Requires a sign change in NPV(bracket_lo)..NPV(bracket_hi) across the dated flows; widen the bracket if bracket_valid is false.",
            "num_cash_flows": 5,
            "regulatory_basis": "Excel XIRR semantics: actual/365 day-count, anchored to the first cash flow date, annualized rate solved from irregular-interval dated cash flows",
            "tolerance": 1e-09,
            "xirr_pct": 37.336253
          }
        }
      }
    }