{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://www.calculatorx.com/schemas/math.percentage.output.json",
  "title": "Percentage — success output",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "status",
    "capability_id",
    "engine",
    "inputs",
    "result",
    "result_detail",
    "calculation_version",
    "verification",
    "review"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "Requested tool id"
    },
    "status": {
      "const": "success"
    },
    "capability_id": {
      "const": "math.percentage"
    },
    "tool": {
      "type": "string",
      "description": "Requested tool id"
    },
    "engine": {
      "type": "string"
    },
    "inputs": {
      "description": "Normalized calculation inputs (aliases resolved to canonical form)",
      "oneOf": [
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "mode": {
              "const": "of"
            },
            "p": {
              "type": "number",
              "x-unit": "%",
              "x-unit-id": "cx:percent",
              "x-quantity-kind": "ratio",
              "x-role": "scalar",
              "x-dimension": [
                0,
                0,
                0,
                0,
                0,
                0,
                0
              ],
              "x-uuce-unit": {
                "unit_id": "cx:percent",
                "revision": "1.0.0",
                "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                "quantity_kind": "ratio",
                "dimension": [
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0
                ],
                "registry_version": "0.3.0-preview.3",
                "digest_contract": "calculatorx-unit-definition-digests-v2",
                "registry_status": "preview",
                "definition_lifecycle": "candidate",
                "role": "scalar"
              }
            },
            "x": {
              "type": "number"
            }
          },
          "required": [
            "mode",
            "p",
            "x"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "mode": {
              "const": "is-what"
            },
            "x": {
              "type": "number"
            },
            "y": {
              "type": "number"
            }
          },
          "required": [
            "mode",
            "x",
            "y"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "mode": {
              "const": "of-what"
            },
            "x": {
              "type": "number"
            },
            "p": {
              "type": "number",
              "x-unit": "%",
              "x-unit-id": "cx:percent",
              "x-quantity-kind": "ratio",
              "x-role": "scalar",
              "x-dimension": [
                0,
                0,
                0,
                0,
                0,
                0,
                0
              ],
              "x-uuce-unit": {
                "unit_id": "cx:percent",
                "revision": "1.0.0",
                "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                "quantity_kind": "ratio",
                "dimension": [
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0
                ],
                "registry_version": "0.3.0-preview.3",
                "digest_contract": "calculatorx-unit-definition-digests-v2",
                "registry_status": "preview",
                "definition_lifecycle": "candidate",
                "role": "scalar"
              }
            }
          },
          "required": [
            "mode",
            "x",
            "p"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "mode": {
              "const": "change"
            },
            "oldV": {
              "type": "number"
            },
            "newV": {
              "type": "number"
            }
          },
          "required": [
            "mode",
            "oldV",
            "newV"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "mode": {
              "const": "adjust-up"
            },
            "x": {
              "type": "number"
            },
            "p": {
              "type": "number",
              "x-unit": "%",
              "x-unit-id": "cx:percent",
              "x-quantity-kind": "ratio",
              "x-role": "scalar",
              "x-dimension": [
                0,
                0,
                0,
                0,
                0,
                0,
                0
              ],
              "x-uuce-unit": {
                "unit_id": "cx:percent",
                "revision": "1.0.0",
                "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                "quantity_kind": "ratio",
                "dimension": [
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0
                ],
                "registry_version": "0.3.0-preview.3",
                "digest_contract": "calculatorx-unit-definition-digests-v2",
                "registry_status": "preview",
                "definition_lifecycle": "candidate",
                "role": "scalar"
              }
            }
          },
          "required": [
            "mode",
            "x",
            "p"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "mode": {
              "const": "adjust-down"
            },
            "x": {
              "type": "number"
            },
            "p": {
              "type": "number",
              "x-unit": "%",
              "x-unit-id": "cx:percent",
              "x-quantity-kind": "ratio",
              "x-role": "scalar",
              "x-dimension": [
                0,
                0,
                0,
                0,
                0,
                0,
                0
              ],
              "x-uuce-unit": {
                "unit_id": "cx:percent",
                "revision": "1.0.0",
                "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                "quantity_kind": "ratio",
                "dimension": [
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0
                ],
                "registry_version": "0.3.0-preview.3",
                "digest_contract": "calculatorx-unit-definition-digests-v2",
                "registry_status": "preview",
                "definition_lifecycle": "candidate",
                "role": "scalar"
              }
            }
          },
          "required": [
            "mode",
            "x",
            "p"
          ]
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "mode": {
              "const": "difference"
            },
            "a": {
              "type": "number"
            },
            "b": {
              "type": "number"
            }
          },
          "required": [
            "mode",
            "a",
            "b"
          ]
        }
      ]
    },
    "result": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "mode",
        "mode_label",
        "heading",
        "value",
        "unit",
        "display",
        "explainer",
        "inputs_summary",
        "formula",
        "steps",
        "status",
        "calculation_version"
      ],
      "properties": {
        "mode": {
          "type": "string"
        },
        "mode_label": {
          "type": "string"
        },
        "heading": {
          "type": "string"
        },
        "explainer": {
          "type": "string"
        },
        "inputs_summary": {
          "type": "string"
        },
        "formula": {
          "type": "string"
        },
        "status": {
          "const": "success"
        },
        "calculation_version": {
          "const": "1.2.0"
        },
        "dir": {
          "type": "string"
        },
        "value": {
          "type": "number"
        },
        "P": {
          "type": "number",
          "x-unit": "%",
          "x-unit-id": "cx:percent",
          "x-quantity-kind": "ratio",
          "x-role": "scalar",
          "x-dimension": [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "x-uuce-unit": {
            "unit_id": "cx:percent",
            "revision": "1.0.0",
            "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
            "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
            "quantity_kind": "ratio",
            "dimension": [
              0,
              0,
              0,
              0,
              0,
              0,
              0
            ],
            "registry_version": "0.3.0-preview.3",
            "digest_contract": "calculatorx-unit-definition-digests-v2",
            "registry_status": "preview",
            "definition_lifecycle": "candidate",
            "role": "scalar"
          }
        },
        "X": {
          "type": "number"
        },
        "Y": {
          "type": "number"
        },
        "oldV": {
          "type": "number"
        },
        "newV": {
          "type": "number"
        },
        "delta": {
          "type": "number"
        },
        "percent_change": {
          "type": "number",
          "x-unit": "%",
          "x-unit-id": "cx:percent",
          "x-quantity-kind": "ratio",
          "x-role": "scalar",
          "x-dimension": [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "x-uuce-unit": {
            "unit_id": "cx:percent",
            "revision": "1.0.0",
            "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
            "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
            "quantity_kind": "ratio",
            "dimension": [
              0,
              0,
              0,
              0,
              0,
              0,
              0
            ],
            "registry_version": "0.3.0-preview.3",
            "digest_contract": "calculatorx-unit-definition-digests-v2",
            "registry_status": "preview",
            "definition_lifecycle": "candidate",
            "role": "scalar"
          }
        },
        "A": {
          "type": "number"
        },
        "B": {
          "type": "number"
        },
        "average": {
          "type": "number"
        },
        "percent_difference": {
          "type": "number",
          "x-unit": "%",
          "x-unit-id": "cx:percent",
          "x-quantity-kind": "ratio",
          "x-role": "scalar",
          "x-dimension": [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "x-uuce-unit": {
            "unit_id": "cx:percent",
            "revision": "1.0.0",
            "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
            "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
            "quantity_kind": "ratio",
            "dimension": [
              0,
              0,
              0,
              0,
              0,
              0,
              0
            ],
            "registry_version": "0.3.0-preview.3",
            "digest_contract": "calculatorx-unit-definition-digests-v2",
            "registry_status": "preview",
            "definition_lifecycle": "candidate",
            "role": "scalar"
          }
        },
        "unit": {
          "enum": [
            null,
            "%"
          ]
        },
        "display": {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "value": {
              "type": "string"
            }
          },
          "required": [
            "value"
          ]
        },
        "steps": {
          "type": "array",
          "minItems": 3,
          "items": {
            "type": "string"
          }
        }
      },
      "oneOf": [
        {
          "properties": {
            "mode": {
              "const": "of"
            }
          },
          "required": [
            "P",
            "X",
            "Y"
          ]
        },
        {
          "properties": {
            "mode": {
              "const": "is-what"
            }
          },
          "required": [
            "P",
            "X",
            "Y"
          ]
        },
        {
          "properties": {
            "mode": {
              "const": "of-what"
            }
          },
          "required": [
            "P",
            "X",
            "Y"
          ]
        },
        {
          "properties": {
            "mode": {
              "const": "change"
            }
          },
          "required": [
            "oldV",
            "newV",
            "delta",
            "percent_change"
          ]
        },
        {
          "properties": {
            "mode": {
              "const": "adjust-up"
            }
          },
          "required": [
            "P",
            "X",
            "Y",
            "dir"
          ]
        },
        {
          "properties": {
            "mode": {
              "const": "adjust-down"
            }
          },
          "required": [
            "P",
            "X",
            "Y",
            "dir"
          ]
        },
        {
          "properties": {
            "mode": {
              "const": "difference"
            }
          },
          "required": [
            "A",
            "B",
            "average",
            "percent_difference"
          ]
        }
      ]
    },
    "result_detail": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "value",
        "unit",
        "formatted"
      ],
      "properties": {
        "unit_contract": {
          "type": "object",
          "const": {
            "protocol": "calculatorx-field-unit-contract-v1",
            "capability_id": "math.percentage",
            "registry_version": "0.3.0-preview.3",
            "declaration_scope": "Field/branch declarations only; inactive fields are not asserted to exist. No conversion-engine migration or new numerical certification.",
            "path_format": "Paths relative to inputs or result_detail.value; dot separates properties, * denotes array items, $ denotes a scalar result.",
            "inputs": {
              "p": {
                "unit": "%",
                "reference": {
                  "unit_id": "cx:percent",
                  "revision": "1.0.0",
                  "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                  "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                  "quantity_kind": "ratio",
                  "dimension": [
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0
                  ],
                  "registry_version": "0.3.0-preview.3",
                  "digest_contract": "calculatorx-unit-definition-digests-v2",
                  "registry_status": "preview",
                  "definition_lifecycle": "candidate",
                  "role": "scalar"
                }
              },
              "pInput": {
                "unit": "%",
                "reference": {
                  "unit_id": "cx:percent",
                  "revision": "1.0.0",
                  "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                  "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                  "quantity_kind": "ratio",
                  "dimension": [
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0
                  ],
                  "registry_version": "0.3.0-preview.3",
                  "digest_contract": "calculatorx-unit-definition-digests-v2",
                  "registry_status": "preview",
                  "definition_lifecycle": "candidate",
                  "role": "scalar"
                }
              },
              "P": {
                "unit": "%",
                "reference": {
                  "unit_id": "cx:percent",
                  "revision": "1.0.0",
                  "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                  "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                  "quantity_kind": "ratio",
                  "dimension": [
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0
                  ],
                  "registry_version": "0.3.0-preview.3",
                  "digest_contract": "calculatorx-unit-definition-digests-v2",
                  "registry_status": "preview",
                  "definition_lifecycle": "candidate",
                  "role": "scalar"
                }
              },
              "percent": {
                "unit": "%",
                "reference": {
                  "unit_id": "cx:percent",
                  "revision": "1.0.0",
                  "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                  "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                  "quantity_kind": "ratio",
                  "dimension": [
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0
                  ],
                  "registry_version": "0.3.0-preview.3",
                  "digest_contract": "calculatorx-unit-definition-digests-v2",
                  "registry_status": "preview",
                  "definition_lifecycle": "candidate",
                  "role": "scalar"
                }
              }
            },
            "outputs": {
              "P": {
                "unit": "%",
                "reference": {
                  "unit_id": "cx:percent",
                  "revision": "1.0.0",
                  "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                  "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                  "quantity_kind": "ratio",
                  "dimension": [
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0
                  ],
                  "registry_version": "0.3.0-preview.3",
                  "digest_contract": "calculatorx-unit-definition-digests-v2",
                  "registry_status": "preview",
                  "definition_lifecycle": "candidate",
                  "role": "scalar"
                }
              },
              "percent_change": {
                "unit": "%",
                "reference": {
                  "unit_id": "cx:percent",
                  "revision": "1.0.0",
                  "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                  "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                  "quantity_kind": "ratio",
                  "dimension": [
                    0,
                    0,
                    0,
                    0,
                    0,
                    0,
                    0
                  ],
                  "registry_version": "0.3.0-preview.3",
                  "digest_contract": "calculatorx-unit-definition-digests-v2",
                  "registry_status": "preview",
                  "definition_lifecycle": "candidate",
                  "role": "scalar"
                }
              },
              "percent_difference": {
                "unit": "%",
                "reference": {
                  "unit_id": "cx:percent",
                  "revision": "1.0.0",
                  "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                  "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                  "quantity_kind": "ratio",
                  "dimension": [
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                    0,
                    0,
                    0,
                    0,
                    0,
                    0
                  ],
                  "registry_version": "0.3.0-preview.3",
                  "digest_contract": "calculatorx-unit-definition-digests-v2",
                  "registry_status": "preview",
                  "definition_lifecycle": "candidate",
                  "role": "scalar"
                }
              }
            },
            "scalar_result_policy": "result.value is percent only in percentage-solving modes; in amount-solving modes it inherits the amount unit. Follow the selected mode and result.unit."
          }
        },
        "value": {
          "type": "object",
          "additionalProperties": false,
          "required": [
            "mode",
            "mode_label",
            "heading",
            "value",
            "unit",
            "display",
            "explainer",
            "inputs_summary",
            "formula",
            "steps",
            "status",
            "calculation_version"
          ],
          "properties": {
            "mode": {
              "type": "string"
            },
            "mode_label": {
              "type": "string"
            },
            "heading": {
              "type": "string"
            },
            "explainer": {
              "type": "string"
            },
            "inputs_summary": {
              "type": "string"
            },
            "formula": {
              "type": "string"
            },
            "status": {
              "const": "success"
            },
            "calculation_version": {
              "const": "1.2.0"
            },
            "dir": {
              "type": "string"
            },
            "value": {
              "type": "number"
            },
            "P": {
              "type": "number",
              "x-unit": "%",
              "x-unit-id": "cx:percent",
              "x-quantity-kind": "ratio",
              "x-role": "scalar",
              "x-dimension": [
                0,
                0,
                0,
                0,
                0,
                0,
                0
              ],
              "x-uuce-unit": {
                "unit_id": "cx:percent",
                "revision": "1.0.0",
                "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                "quantity_kind": "ratio",
                "dimension": [
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                  0,
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                  0,
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                ],
                "registry_version": "0.3.0-preview.3",
                "digest_contract": "calculatorx-unit-definition-digests-v2",
                "registry_status": "preview",
                "definition_lifecycle": "candidate",
                "role": "scalar"
              }
            },
            "X": {
              "type": "number"
            },
            "Y": {
              "type": "number"
            },
            "oldV": {
              "type": "number"
            },
            "newV": {
              "type": "number"
            },
            "delta": {
              "type": "number"
            },
            "percent_change": {
              "type": "number",
              "x-unit": "%",
              "x-unit-id": "cx:percent",
              "x-quantity-kind": "ratio",
              "x-role": "scalar",
              "x-dimension": [
                0,
                0,
                0,
                0,
                0,
                0,
                0
              ],
              "x-uuce-unit": {
                "unit_id": "cx:percent",
                "revision": "1.0.0",
                "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                "quantity_kind": "ratio",
                "dimension": [
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0
                ],
                "registry_version": "0.3.0-preview.3",
                "digest_contract": "calculatorx-unit-definition-digests-v2",
                "registry_status": "preview",
                "definition_lifecycle": "candidate",
                "role": "scalar"
              }
            },
            "A": {
              "type": "number"
            },
            "B": {
              "type": "number"
            },
            "average": {
              "type": "number"
            },
            "percent_difference": {
              "type": "number",
              "x-unit": "%",
              "x-unit-id": "cx:percent",
              "x-quantity-kind": "ratio",
              "x-role": "scalar",
              "x-dimension": [
                0,
                0,
                0,
                0,
                0,
                0,
                0
              ],
              "x-uuce-unit": {
                "unit_id": "cx:percent",
                "revision": "1.0.0",
                "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
                "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
                "quantity_kind": "ratio",
                "dimension": [
                  0,
                  0,
                  0,
                  0,
                  0,
                  0,
                  0
                ],
                "registry_version": "0.3.0-preview.3",
                "digest_contract": "calculatorx-unit-definition-digests-v2",
                "registry_status": "preview",
                "definition_lifecycle": "candidate",
                "role": "scalar"
              }
            },
            "unit": {
              "enum": [
                null,
                "%"
              ]
            },
            "display": {
              "type": "object",
              "additionalProperties": false,
              "properties": {
                "value": {
                  "type": "string"
                }
              },
              "required": [
                "value"
              ]
            },
            "steps": {
              "type": "array",
              "minItems": 3,
              "items": {
                "type": "string"
              }
            }
          },
          "oneOf": [
            {
              "properties": {
                "mode": {
                  "const": "of"
                }
              },
              "required": [
                "P",
                "X",
                "Y"
              ]
            },
            {
              "properties": {
                "mode": {
                  "const": "is-what"
                }
              },
              "required": [
                "P",
                "X",
                "Y"
              ]
            },
            {
              "properties": {
                "mode": {
                  "const": "of-what"
                }
              },
              "required": [
                "P",
                "X",
                "Y"
              ]
            },
            {
              "properties": {
                "mode": {
                  "const": "change"
                }
              },
              "required": [
                "oldV",
                "newV",
                "delta",
                "percent_change"
              ]
            },
            {
              "properties": {
                "mode": {
                  "const": "adjust-up"
                }
              },
              "required": [
                "P",
                "X",
                "Y",
                "dir"
              ]
            },
            {
              "properties": {
                "mode": {
                  "const": "adjust-down"
                }
              },
              "required": [
                "P",
                "X",
                "Y",
                "dir"
              ]
            },
            {
              "properties": {
                "mode": {
                  "const": "difference"
                }
              },
              "required": [
                "A",
                "B",
                "average",
                "percent_difference"
              ]
            }
          ]
        },
        "unit": {
          "type": [
            "string",
            "null"
          ]
        },
        "formatted": {
          "type": [
            "string",
            "null"
          ]
        }
      }
    },
    "formula": {
      "anyOf": [
        {
          "type": "null"
        },
        {
          "type": "string"
        },
        {
          "type": "object",
          "additionalProperties": false,
          "properties": {
            "id": {
              "type": "string"
            },
            "expression": {
              "type": "string"
            },
            "label": {
              "type": "string"
            }
          }
        }
      ]
    },
    "assumptions": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "warnings": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "code"
        ],
        "properties": {
          "code": {
            "type": "string"
          },
          "severity": {
            "type": "string"
          },
          "detail": {
            "type": "string"
          },
          "suggestion": {
            "type": "string"
          }
        }
      }
    },
    "verification": {
      "type": "object",
      "additionalProperties": false,
      "description": "Computational verification under CVP. Review-policy tiers live on `review`, not here.",
      "required": [
        "cvp"
      ],
      "properties": {
        "cvp": {
          "type": "object",
          "additionalProperties": false,
          "required": [
            "status",
            "protocol",
            "profile",
            "verified_scope",
            "verification_revision",
            "evidence_digest"
          ],
          "properties": {
            "status": {
              "type": "string",
              "description": "CVP verification status (e.g. VERIFIED)"
            },
            "protocol": {
              "type": "string",
              "description": "CVP protocol id, e.g. 1.0.0-proposed"
            },
            "profile": {
              "type": "string"
            },
            "verified_scope": {
              "type": "string"
            },
            "verification_revision": {
              "type": [
                "string",
                "null"
              ]
            },
            "evidence_digest": {
              "type": [
                "string",
                "null"
              ]
            },
            "production": {
              "type": [
                "string",
                "null"
              ],
              "description": "Production freshness, e.g. CURRENT"
            },
            "evidence": {
              "type": "string",
              "format": "uri"
            }
          }
        }
      }
    },
    "review": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "tier",
        "engine_tested",
        "expert_reviewed",
        "source_checked",
        "reviewed_by",
        "reviewer_role",
        "last_reviewed"
      ],
      "properties": {
        "tier": {
          "type": "string",
          "enum": [
            "candidate",
            "engine_tested",
            "internally_reviewed",
            "expert_verified"
          ]
        },
        "engine_tested": {
          "type": "boolean"
        },
        "expert_reviewed": {
          "type": "boolean"
        },
        "internally_reviewed": {
          "type": "boolean"
        },
        "review_kind": {
          "type": [
            "string",
            "null"
          ]
        },
        "source_checked": {
          "type": "boolean"
        },
        "reviewed_by": {
          "type": [
            "string",
            "null"
          ]
        },
        "reviewer_role": {
          "type": [
            "string",
            "null"
          ]
        },
        "last_reviewed": {
          "type": [
            "string",
            "null"
          ]
        }
      },
      "allOf": [
        {
          "if": {
            "properties": {
              "tier": {
                "const": "expert_verified"
              }
            },
            "required": [
              "tier"
            ]
          },
          "then": {
            "properties": {
              "engine_tested": {
                "const": true
              },
              "expert_reviewed": {
                "const": true
              },
              "source_checked": {
                "const": true
              },
              "reviewed_by": {
                "type": "string",
                "minLength": 1
              },
              "reviewer_role": {
                "type": "string",
                "minLength": 1
              },
              "last_reviewed": {
                "type": "string",
                "minLength": 1
              }
            }
          }
        },
        {
          "if": {
            "properties": {
              "tier": {
                "const": "internally_reviewed"
              }
            },
            "required": [
              "tier"
            ]
          },
          "then": {
            "properties": {
              "engine_tested": {
                "const": true
              },
              "internally_reviewed": {
                "const": true
              },
              "source_checked": {
                "const": true
              }
            }
          }
        },
        {
          "if": {
            "properties": {
              "tier": {
                "const": "engine_tested"
              }
            },
            "required": [
              "tier"
            ]
          },
          "then": {
            "properties": {
              "engine_tested": {
                "const": true
              }
            }
          }
        }
      ]
    },
    "calculation_version": {
      "type": "string",
      "const": "1.2.0"
    },
    "api_version": {
      "type": "string"
    },
    "api_contract_version": {
      "type": "string"
    },
    "spec_version": {
      "type": "string"
    },
    "page": {
      "type": [
        "string",
        "null"
      ],
      "description": "Canonical calculator page URL"
    },
    "links": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "schema_input": {
          "type": "string",
          "format": "uri"
        },
        "schema_output": {
          "type": "string",
          "format": "uri"
        },
        "evidence": {
          "type": "string",
          "format": "uri"
        },
        "openapi": {
          "type": "string",
          "format": "uri"
        },
        "capabilities": {
          "type": "string",
          "format": "uri"
        },
        "mcp": {
          "type": "string",
          "format": "uri"
        }
      }
    }
  },
  "x-unit-contract": {
    "protocol": "calculatorx-field-unit-contract-v1",
    "capability_id": "math.percentage",
    "registry_version": "0.3.0-preview.3",
    "declaration_scope": "Field/branch declarations only; inactive fields are not asserted to exist. No conversion-engine migration or new numerical certification.",
    "path_format": "Paths relative to inputs or result_detail.value; dot separates properties, * denotes array items, $ denotes a scalar result.",
    "inputs": {
      "p": {
        "unit": "%",
        "reference": {
          "unit_id": "cx:percent",
          "revision": "1.0.0",
          "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
          "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
          "quantity_kind": "ratio",
          "dimension": [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "registry_version": "0.3.0-preview.3",
          "digest_contract": "calculatorx-unit-definition-digests-v2",
          "registry_status": "preview",
          "definition_lifecycle": "candidate",
          "role": "scalar"
        }
      },
      "pInput": {
        "unit": "%",
        "reference": {
          "unit_id": "cx:percent",
          "revision": "1.0.0",
          "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
          "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
          "quantity_kind": "ratio",
          "dimension": [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "registry_version": "0.3.0-preview.3",
          "digest_contract": "calculatorx-unit-definition-digests-v2",
          "registry_status": "preview",
          "definition_lifecycle": "candidate",
          "role": "scalar"
        }
      },
      "P": {
        "unit": "%",
        "reference": {
          "unit_id": "cx:percent",
          "revision": "1.0.0",
          "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
          "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
          "quantity_kind": "ratio",
          "dimension": [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "registry_version": "0.3.0-preview.3",
          "digest_contract": "calculatorx-unit-definition-digests-v2",
          "registry_status": "preview",
          "definition_lifecycle": "candidate",
          "role": "scalar"
        }
      },
      "percent": {
        "unit": "%",
        "reference": {
          "unit_id": "cx:percent",
          "revision": "1.0.0",
          "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
          "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
          "quantity_kind": "ratio",
          "dimension": [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "registry_version": "0.3.0-preview.3",
          "digest_contract": "calculatorx-unit-definition-digests-v2",
          "registry_status": "preview",
          "definition_lifecycle": "candidate",
          "role": "scalar"
        }
      }
    },
    "outputs": {
      "P": {
        "unit": "%",
        "reference": {
          "unit_id": "cx:percent",
          "revision": "1.0.0",
          "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
          "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
          "quantity_kind": "ratio",
          "dimension": [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "registry_version": "0.3.0-preview.3",
          "digest_contract": "calculatorx-unit-definition-digests-v2",
          "registry_status": "preview",
          "definition_lifecycle": "candidate",
          "role": "scalar"
        }
      },
      "percent_change": {
        "unit": "%",
        "reference": {
          "unit_id": "cx:percent",
          "revision": "1.0.0",
          "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
          "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
          "quantity_kind": "ratio",
          "dimension": [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "registry_version": "0.3.0-preview.3",
          "digest_contract": "calculatorx-unit-definition-digests-v2",
          "registry_status": "preview",
          "definition_lifecycle": "candidate",
          "role": "scalar"
        }
      },
      "percent_difference": {
        "unit": "%",
        "reference": {
          "unit_id": "cx:percent",
          "revision": "1.0.0",
          "content_digest": "f73c887f011a6f997b183701a1b03417b3c89a863747910a54ae79c6a6b9f963",
          "dependency_digest": "58d9bc109880e0c8ea6d45264fbba933f64a17cf17586d2a8dbbf7cbea14566d",
          "quantity_kind": "ratio",
          "dimension": [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          "registry_version": "0.3.0-preview.3",
          "digest_contract": "calculatorx-unit-definition-digests-v2",
          "registry_status": "preview",
          "definition_lifecycle": "candidate",
          "role": "scalar"
        }
      }
    },
    "scalar_result_policy": "result.value is percent only in percentage-solving modes; in amount-solving modes it inherits the amount unit. Follow the selected mode and result.unit."
  }
}