{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "required": ["experiment-id", "subject", "arm-id", "model-id", "request-sha256", "first-result-only", "revision-count-at-capture", "output-ref", "output-sha256", "screenshots", "evaluator-blinded", "metrics"],
  "properties": {
    "experiment-id": {"type": "string", "minLength": 1},
    "subject": {"type": "string", "minLength": 1},
    "arm-id": {"enum": ["A", "B"]},
    "model-id": {"type": "string", "minLength": 1},
    "request-sha256": {"type": "string", "pattern": "^[0-9a-f]{64}$"},
    "first-result-only": {"const": true},
    "revision-count-at-capture": {"const": 0},
    "output-ref": {"type": "string", "minLength": 1},
    "output-sha256": {"type": "string", "pattern": "^[0-9a-f]{64}$"},
    "screenshots": {
      "type": "object",
      "required": ["desktop", "mobile"],
      "properties": {
        "desktop": {"$ref": "#/definitions/fileEvidence"},
        "mobile": {"$ref": "#/definitions/fileEvidence"}
      }
    },
    "evaluator-blinded": {"const": true},
    "metrics": {
      "type": "object",
      "required": ["product-purpose-understood-in-5s", "primary-action-found", "information-hierarchy", "category-quality-parity", "visual-craft", "mobile-clarity", "design-system-consistency", "human-preference", "revision-count-to-acceptance", "tokens-to-acceptance"],
      "properties": {
        "product-purpose-understood-in-5s": {"type": "integer", "minimum": 1, "maximum": 5},
        "primary-action-found": {"type": "integer", "minimum": 1, "maximum": 5},
        "information-hierarchy": {"type": "integer", "minimum": 1, "maximum": 5},
        "category-quality-parity": {"type": "integer", "minimum": 1, "maximum": 5},
        "visual-craft": {"type": "integer", "minimum": 1, "maximum": 5},
        "mobile-clarity": {"type": "integer", "minimum": 1, "maximum": 5},
        "design-system-consistency": {"type": "integer", "minimum": 1, "maximum": 5},
        "human-preference": {"type": "integer", "minimum": 1, "maximum": 5},
        "revision-count-to-acceptance": {"type": "integer", "minimum": 0},
        "tokens-to-acceptance": {"type": "integer", "minimum": 0}
      },
      "additionalProperties": false
    }
  },
  "definitions": {
    "fileEvidence": {
      "type": "object",
      "required": ["path", "sha256"],
      "properties": {
        "path": {"type": "string", "minLength": 1},
        "sha256": {"type": "string", "pattern": "^[0-9a-f]{64}$"}
      }
    }
  },
  "additionalProperties": true
}