{
  "capability_id": "electrical.swg_to_mm",
  "tool_id": "swg-to-mm",
  "engine": "swg",
  "calculation_version": "1.3.1",
  "generated_at": "2026-09-16T22:03:43.710Z",
  "engine_build": "2026-09-10",
  "test_count": 76,
  "passed": 76,
  "failed": 0,
  "tests_summary": {
    "golden": {
      "total": 63,
      "passed": 63
    },
    "boundary": {
      "total": 8,
      "passed": 8
    },
    "property": {
      "total": 5,
      "passed": 5
    }
  },
  "engine_tested": true,
  "expert_reviewed": false,
  "internally_reviewed": false,
  "review_kind": null,
  "source_checked": true,
  "reviewed_by": null,
  "reviewer_role": null,
  "last_reviewed": null,
  "expert_review": {
    "status": "optional_not_performed",
    "reviewer": null,
    "scope": [
      "formula",
      "input semantics",
      "assumptions",
      "limitations",
      "sources",
      "tests"
    ],
    "note": "Domain expert review is optional under CVP (CVP-EXP-01). Absence does not block CVP Verified. See Review policy for supplemental domain assurance."
  },
  "internal_review": {
    "status": "not_applicable",
    "reviewer": null
  },
  "page": "https://www.calculatorx.com/calc/wire/swg-to-mm",
  "api": "https://www.calculatorx.com/api/v1/calc/swg-to-mm",
  "schema_input": "https://www.calculatorx.com/schemas/electrical.swg_to_mm.input.json",
  "schema_output": "https://www.calculatorx.com/schemas/electrical.swg_to_mm.output.json",
  "assumptions": [
    "Canonical size is the Imperial SWG inch table (7/0–50). millimetre = inch × 25.4 (exact).",
    "Area uses that millimetre, not a rounded display value.",
    "Area assumes a solid circular cross-section of that diameter.",
    "For tube/sheet use-cases, interpret d as wall/sheet thickness.",
    "SWG 0 and 1/0 share the tabulated 0.324 in size used here; some catalogues list 1/0 separately."
  ],
  "limitations": [
    "Lookup table only for integer SWG 7/0 (−6) through 50",
    "Out-of-range → SWG_OUT_OF_RANGE (not 0 mm)",
    "Non-integer → SWG_NOT_INTEGER (not Math.round)",
    "Canonical diameter is inch; mm = inch × 25.4 (exact); area uses that mm",
    "SWG ≠ AWG; same number different diameter"
  ],
  "boundary_conditions": [
    "Missing/empty swg → MISSING_REQUIRED_INPUT (not 0 mm)",
    "Unparseable swg → INVALID_NUMBER",
    "Non-integer SWG → SWG_NOT_INTEGER (not Math.round)",
    "SWG outside 7/0 (−6)…50 → SWG_OUT_OF_RANGE (not 0 mm)",
    "field not mm|mm2 → INVALID_MODE",
    "Lower SWG number → thicker diameter (within table)",
    "field=mm → diameter; field=mm2 → πd²/4 from exact mm",
    "UI/share mode=swg-mm|swg-mm2 maps to field; query a aliases swg"
  ],
  "sources": [
    {
      "title": "British Standards Institution — BS 3737:1964",
      "section": "Guide to series of basic sizes for metal sheet, strip and wire — Status: Withdrawn. Public catalogue confirms identity/status. Exact PDF table/clause/page is not asserted. The 57-row inch dataset was independently checked 2026-09-10 against Wikipedia, Engineering Toolbox, and Trojan SF (57/57 inch identity); 0.324 in is canonical SWG 0, with 1/0 as alias.",
      "url": "https://knowledge.bsigroup.com/products/guide-to-series-of-basic-sizes-for-metal-sheet-strip-and-wire",
      "supports": "Historical definition/reference for Imperial SWG diameter series (inch). Used as historical identity, not a current BSI product standard, and not a row-by-row BSI PDF transcription.",
      "kind": "standard"
    },
    {
      "title": "NIST Guide to the SI (SP 811)",
      "section": "Millimetre as the SI unit for length; 1 in = 25.4 mm exactly",
      "url": "https://www.nist.gov/pml/special-publication-811",
      "supports": "d_mm = d_in × 25.4; diameter output in mm and area in mm²",
      "kind": "reference"
    }
  ],
  "methods": [],
  "fingerprint": "sha256:6681584e7bcf14adc599b12fb4de1ab3655d15c60d532bfe5b5a75e7060b4209",
  "tests": [
    {
      "id": "swg-14-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 14,
        "field": "mm"
      },
      "expect": 2.032,
      "expectWarning": null,
      "actual": 2.032,
      "tol": 1e-12
    },
    {
      "id": "swg-14-mm2",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 14,
        "field": "mm2"
      },
      "expect": 3.2429278662239858,
      "expectWarning": null,
      "actual": 3.2429278662239853,
      "tol": 1e-12
    },
    {
      "id": "swg-22-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 22,
        "field": "mm"
      },
      "expect": 0.7112,
      "expectWarning": null,
      "actual": 0.7111999999999999,
      "tol": 1e-12
    },
    {
      "id": "swg-22-mm2",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 22,
        "field": "mm2"
      },
      "expect": 0.39725866361243817,
      "expectWarning": null,
      "actual": 0.39725866361243817,
      "tol": 1e-12
    },
    {
      "id": "swg-50-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 50,
        "field": "mm"
      },
      "expect": 0.0254,
      "expectWarning": null,
      "actual": 0.0254,
      "tol": 1e-12
    },
    {
      "id": "swg-50-mm2",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 50,
        "field": "mm2"
      },
      "expect": 0.0005067074790974977,
      "expectWarning": null,
      "actual": 0.0005067074790974977,
      "tol": 1e-12
    },
    {
      "id": "swg-neg6-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": -6,
        "field": "mm"
      },
      "expect": 12.7,
      "expectWarning": null,
      "actual": 12.7,
      "tol": 1e-12
    },
    {
      "id": "swg-0-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 0,
        "field": "mm"
      },
      "expect": 8.2296,
      "expectWarning": null,
      "actual": 8.2296,
      "tol": 1e-12
    },
    {
      "id": "swg-16-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 16,
        "field": "mm"
      },
      "expect": 1.6256,
      "expectWarning": null,
      "actual": 1.6256,
      "tol": 1e-12
    },
    {
      "id": "table-swg-6_0-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": -5,
        "field": "mm"
      },
      "expect": 11.7856,
      "expectWarning": null,
      "actual": 11.7856,
      "tol": 1e-12
    },
    {
      "id": "table-swg-5_0-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": -4,
        "field": "mm"
      },
      "expect": 10.9728,
      "expectWarning": null,
      "actual": 10.9728,
      "tol": 1e-12
    },
    {
      "id": "table-swg-4_0-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": -3,
        "field": "mm"
      },
      "expect": 10.16,
      "expectWarning": null,
      "actual": 10.16,
      "tol": 1e-12
    },
    {
      "id": "table-swg-3_0-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": -2,
        "field": "mm"
      },
      "expect": 9.448799999999999,
      "expectWarning": null,
      "actual": 9.448799999999999,
      "tol": 1e-12
    },
    {
      "id": "table-swg-2_0-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": -1,
        "field": "mm"
      },
      "expect": 8.839199999999998,
      "expectWarning": null,
      "actual": 8.839199999999998,
      "tol": 1e-12
    },
    {
      "id": "table-swg-1-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 1,
        "field": "mm"
      },
      "expect": 7.619999999999999,
      "expectWarning": null,
      "actual": 7.619999999999999,
      "tol": 1e-12
    },
    {
      "id": "table-swg-2-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 2,
        "field": "mm"
      },
      "expect": 7.010400000000001,
      "expectWarning": null,
      "actual": 7.010400000000001,
      "tol": 1e-12
    },
    {
      "id": "table-swg-3-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 3,
        "field": "mm"
      },
      "expect": 6.400799999999999,
      "expectWarning": null,
      "actual": 6.400799999999999,
      "tol": 1e-12
    },
    {
      "id": "table-swg-4-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 4,
        "field": "mm"
      },
      "expect": 5.8928,
      "expectWarning": null,
      "actual": 5.8928,
      "tol": 1e-12
    },
    {
      "id": "table-swg-5-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 5,
        "field": "mm"
      },
      "expect": 5.384799999999999,
      "expectWarning": null,
      "actual": 5.384799999999999,
      "tol": 1e-12
    },
    {
      "id": "table-swg-6-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 6,
        "field": "mm"
      },
      "expect": 4.8768,
      "expectWarning": null,
      "actual": 4.8768,
      "tol": 1e-12
    },
    {
      "id": "table-swg-7-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 7,
        "field": "mm"
      },
      "expect": 4.4704,
      "expectWarning": null,
      "actual": 4.4704,
      "tol": 1e-12
    },
    {
      "id": "table-swg-8-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 8,
        "field": "mm"
      },
      "expect": 4.064,
      "expectWarning": null,
      "actual": 4.064,
      "tol": 1e-12
    },
    {
      "id": "table-swg-9-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 9,
        "field": "mm"
      },
      "expect": 3.6575999999999995,
      "expectWarning": null,
      "actual": 3.6575999999999995,
      "tol": 1e-12
    },
    {
      "id": "table-swg-10-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 10,
        "field": "mm"
      },
      "expect": 3.2512,
      "expectWarning": null,
      "actual": 3.2512,
      "tol": 1e-12
    },
    {
      "id": "table-swg-11-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 11,
        "field": "mm"
      },
      "expect": 2.9464,
      "expectWarning": null,
      "actual": 2.9464,
      "tol": 1e-12
    },
    {
      "id": "table-swg-12-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 12,
        "field": "mm"
      },
      "expect": 2.6416,
      "expectWarning": null,
      "actual": 2.6416,
      "tol": 1e-12
    },
    {
      "id": "table-swg-13-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 13,
        "field": "mm"
      },
      "expect": 2.3367999999999998,
      "expectWarning": null,
      "actual": 2.3367999999999998,
      "tol": 1e-12
    },
    {
      "id": "table-swg-15-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 15,
        "field": "mm"
      },
      "expect": 1.8287999999999998,
      "expectWarning": null,
      "actual": 1.8287999999999998,
      "tol": 1e-12
    },
    {
      "id": "table-swg-17-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 17,
        "field": "mm"
      },
      "expect": 1.4223999999999999,
      "expectWarning": null,
      "actual": 1.4223999999999999,
      "tol": 1e-12
    },
    {
      "id": "table-swg-18-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 18,
        "field": "mm"
      },
      "expect": 1.2192,
      "expectWarning": null,
      "actual": 1.2192,
      "tol": 1e-12
    },
    {
      "id": "table-swg-19-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 19,
        "field": "mm"
      },
      "expect": 1.016,
      "expectWarning": null,
      "actual": 1.016,
      "tol": 1e-12
    },
    {
      "id": "table-swg-20-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 20,
        "field": "mm"
      },
      "expect": 0.9143999999999999,
      "expectWarning": null,
      "actual": 0.9143999999999999,
      "tol": 1e-12
    },
    {
      "id": "table-swg-21-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 21,
        "field": "mm"
      },
      "expect": 0.8128,
      "expectWarning": null,
      "actual": 0.8128,
      "tol": 1e-12
    },
    {
      "id": "table-swg-22-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 22,
        "field": "mm"
      },
      "expect": 0.7111999999999999,
      "expectWarning": null,
      "actual": 0.7111999999999999,
      "tol": 1e-12
    },
    {
      "id": "table-swg-23-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 23,
        "field": "mm"
      },
      "expect": 0.6096,
      "expectWarning": null,
      "actual": 0.6096,
      "tol": 1e-12
    },
    {
      "id": "table-swg-24-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 24,
        "field": "mm"
      },
      "expect": 0.5588,
      "expectWarning": null,
      "actual": 0.5588,
      "tol": 1e-12
    },
    {
      "id": "table-swg-25-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 25,
        "field": "mm"
      },
      "expect": 0.508,
      "expectWarning": null,
      "actual": 0.508,
      "tol": 1e-12
    },
    {
      "id": "table-swg-26-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 26,
        "field": "mm"
      },
      "expect": 0.45719999999999994,
      "expectWarning": null,
      "actual": 0.45719999999999994,
      "tol": 1e-12
    },
    {
      "id": "table-swg-27-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 27,
        "field": "mm"
      },
      "expect": 0.41656,
      "expectWarning": null,
      "actual": 0.41656,
      "tol": 1e-12
    },
    {
      "id": "table-swg-28-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 28,
        "field": "mm"
      },
      "expect": 0.37592,
      "expectWarning": null,
      "actual": 0.37592,
      "tol": 1e-12
    },
    {
      "id": "table-swg-29-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 29,
        "field": "mm"
      },
      "expect": 0.34543999999999997,
      "expectWarning": null,
      "actual": 0.34543999999999997,
      "tol": 1e-12
    },
    {
      "id": "table-swg-30-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 30,
        "field": "mm"
      },
      "expect": 0.31495999999999996,
      "expectWarning": null,
      "actual": 0.31495999999999996,
      "tol": 1e-12
    },
    {
      "id": "table-swg-31-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 31,
        "field": "mm"
      },
      "expect": 0.29463999999999996,
      "expectWarning": null,
      "actual": 0.29463999999999996,
      "tol": 1e-12
    },
    {
      "id": "table-swg-32-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 32,
        "field": "mm"
      },
      "expect": 0.27432,
      "expectWarning": null,
      "actual": 0.27432,
      "tol": 1e-12
    },
    {
      "id": "table-swg-33-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 33,
        "field": "mm"
      },
      "expect": 0.254,
      "expectWarning": null,
      "actual": 0.254,
      "tol": 1e-12
    },
    {
      "id": "table-swg-34-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 34,
        "field": "mm"
      },
      "expect": 0.23367999999999997,
      "expectWarning": null,
      "actual": 0.23367999999999997,
      "tol": 1e-12
    },
    {
      "id": "table-swg-35-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 35,
        "field": "mm"
      },
      "expect": 0.21335999999999997,
      "expectWarning": null,
      "actual": 0.21335999999999997,
      "tol": 1e-12
    },
    {
      "id": "table-swg-36-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 36,
        "field": "mm"
      },
      "expect": 0.19304,
      "expectWarning": null,
      "actual": 0.19304,
      "tol": 1e-12
    },
    {
      "id": "table-swg-37-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 37,
        "field": "mm"
      },
      "expect": 0.17271999999999998,
      "expectWarning": null,
      "actual": 0.17271999999999998,
      "tol": 1e-12
    },
    {
      "id": "table-swg-38-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 38,
        "field": "mm"
      },
      "expect": 0.1524,
      "expectWarning": null,
      "actual": 0.1524,
      "tol": 1e-12
    },
    {
      "id": "table-swg-39-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 39,
        "field": "mm"
      },
      "expect": 0.13207999999999998,
      "expectWarning": null,
      "actual": 0.13207999999999998,
      "tol": 1e-12
    },
    {
      "id": "table-swg-40-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 40,
        "field": "mm"
      },
      "expect": 0.12191999999999999,
      "expectWarning": null,
      "actual": 0.12191999999999999,
      "tol": 1e-12
    },
    {
      "id": "table-swg-41-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 41,
        "field": "mm"
      },
      "expect": 0.11176,
      "expectWarning": null,
      "actual": 0.11176,
      "tol": 1e-12
    },
    {
      "id": "table-swg-42-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 42,
        "field": "mm"
      },
      "expect": 0.1016,
      "expectWarning": null,
      "actual": 0.1016,
      "tol": 1e-12
    },
    {
      "id": "table-swg-43-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 43,
        "field": "mm"
      },
      "expect": 0.09144,
      "expectWarning": null,
      "actual": 0.09144,
      "tol": 1e-12
    },
    {
      "id": "table-swg-44-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 44,
        "field": "mm"
      },
      "expect": 0.08128,
      "expectWarning": null,
      "actual": 0.08128,
      "tol": 1e-12
    },
    {
      "id": "table-swg-45-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 45,
        "field": "mm"
      },
      "expect": 0.07111999999999999,
      "expectWarning": null,
      "actual": 0.07111999999999999,
      "tol": 1e-12
    },
    {
      "id": "table-swg-46-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 46,
        "field": "mm"
      },
      "expect": 0.06095999999999999,
      "expectWarning": null,
      "actual": 0.06095999999999999,
      "tol": 1e-12
    },
    {
      "id": "table-swg-47-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 47,
        "field": "mm"
      },
      "expect": 0.0508,
      "expectWarning": null,
      "actual": 0.0508,
      "tol": 1e-12
    },
    {
      "id": "table-swg-48-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 48,
        "field": "mm"
      },
      "expect": 0.04064,
      "expectWarning": null,
      "actual": 0.04064,
      "tol": 1e-12
    },
    {
      "id": "table-swg-49-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": 49,
        "field": "mm"
      },
      "expect": 0.030479999999999997,
      "expectWarning": null,
      "actual": 0.030479999999999997,
      "tol": 1e-12
    },
    {
      "id": "table-swg-7-0-token-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": "7/0",
        "field": "mm"
      },
      "expect": 12.7,
      "expectWarning": null,
      "actual": 12.7,
      "tol": 1e-12
    },
    {
      "id": "table-swg-1-0-token-mm",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "swg": "1/0",
        "field": "mm"
      },
      "expect": 8.2296,
      "expectWarning": null,
      "actual": 8.2296,
      "tol": 1e-12
    },
    {
      "id": "boundary-swg-out-of-table",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "swg": 60,
        "field": "mm"
      },
      "expectError": "SWG_OUT_OF_RANGE",
      "code": "SWG_OUT_OF_RANGE",
      "error": "Supported SWG range is 7/0 (−6) through 50"
    },
    {
      "id": "boundary-swg-below",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "swg": -7,
        "field": "mm"
      },
      "expectError": "SWG_OUT_OF_RANGE",
      "code": "SWG_OUT_OF_RANGE",
      "error": "Supported SWG range is 7/0 (−6) through 50"
    },
    {
      "id": "boundary-swg-not-integer",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "swg": 14.4,
        "field": "mm"
      },
      "expectError": "SWG_NOT_INTEGER",
      "code": "SWG_NOT_INTEGER",
      "error": "SWG must be an integer standard gauge"
    },
    {
      "id": "boundary-swg-half",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "swg": 14.5,
        "field": "mm"
      },
      "expectError": "SWG_NOT_INTEGER",
      "code": "SWG_NOT_INTEGER",
      "error": "SWG must be an integer standard gauge"
    },
    {
      "id": "boundary-swg-unparseable",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "swg": "abc",
        "field": "mm"
      },
      "expectError": "INVALID_NUMBER",
      "code": "INVALID_NUMBER",
      "error": "swg must be an integer gauge or token such as 14, 7/0, 2/0"
    },
    {
      "id": "boundary-swg-empty",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "swg": "",
        "field": "mm"
      },
      "expectError": "MISSING_REQUIRED_INPUT",
      "code": "MISSING_REQUIRED_INPUT",
      "error": "swg is required"
    },
    {
      "id": "boundary-swg-missing",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "field": "mm"
      },
      "expectError": "MISSING_REQUIRED_INPUT",
      "code": "MISSING_REQUIRED_INPUT",
      "error": "swg is required"
    },
    {
      "id": "boundary-swg-invalid-field",
      "ok": true,
      "kind": "boundary",
      "inputs": {
        "swg": 14,
        "field": "inch"
      },
      "expectError": "INVALID_MODE",
      "code": "INVALID_MODE",
      "error": "field must be \"mm\" or \"mm2\""
    },
    {
      "id": "property-deterministic",
      "ok": true,
      "kind": "property",
      "detail": "same SWG → same mm",
      "expect": 1.6256,
      "actual": 1.6256
    },
    {
      "id": "property-thicker-lower-swg",
      "ok": true,
      "kind": "property",
      "detail": "SWG10 > SWG16 diameter",
      "expect": true,
      "actual": true
    },
    {
      "id": "property-area-from-diameter",
      "ok": true,
      "kind": "property",
      "detail": "mm² = πd²/4 from exact mm",
      "expect": 3.2429278662239853,
      "actual": 3.2429278662239853
    },
    {
      "id": "property-7-0-token",
      "ok": true,
      "kind": "property",
      "detail": "7/0 equals −6",
      "expect": 12.7,
      "actual": 12.7
    },
    {
      "id": "property-monotonic-table",
      "ok": true,
      "kind": "property",
      "detail": "diameter decreases as SWG increases (−6…50)",
      "expect": true,
      "actual": true
    }
  ],
  "tier": "engine_tested",
  "verification": {
    "tests": {
      "passed": 76,
      "total": 76,
      "golden": 63,
      "boundary": 8,
      "property": 5
    },
    "contract_checks": {
      "passed": 4,
      "total": 4
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  },
  "evidence_core_generated_at": "2026-09-10T22:48:17.762Z",
  "rendered_at": "2026-09-16T22:03:43.710Z",
  "release_integrity": {
    "status": "verified",
    "scope": "workspace",
    "production_attestation_required": true,
    "calculation_version": "1.3.1",
    "artifacts": {
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      "page": "1.3.1",
      "capability": "1.3.1",
      "evidence": "1.3.1",
      "input_schema": "1.3.1",
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    "contract_checks": {
      "total": 4,
      "passed": 4,
      "failed": 0,
      "items": [
        {
          "id": "release-artifacts-aligned",
          "status": "pass",
          "detail": "1.3.1"
        },
        {
          "id": "schema-valid-input-executes",
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        },
        {
          "id": "engine-success-output-validates-schema",
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        },
        {
          "id": "schema-rejects-incomplete-input",
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      ]
    },
    "report": "https://www.calculatorx.com/.well-known/calculatorx-release-integrity.json"
  }
}