{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://cis2042.github.io/ux3-product-design-harness/schemas/evidence.schema.json",
  "title": "Product Design Harness Evidence Receipt",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "evidence_id",
    "source_id",
    "source_type",
    "raw_artifact_uri",
    "signal_type",
    "signal",
    "interpretation",
    "decision_impact",
    "evidence_tier",
    "confidence_level",
    "counter_signal",
    "collected_at",
    "source_last_verified_at",
    "max_staleness_days"
  ],
  "properties": {
    "evidence_id": {
      "type": "string",
      "minLength": 1
    },
    "source_id": {
      "type": "string",
      "minLength": 1
    },
    "source_type": {
      "type": "string",
      "enum": [
        "internal",
        "external",
        "workflow",
        "risk",
        "direct_learning"
      ]
    },
    "raw_artifact_uri": {
      "type": "string",
      "minLength": 1
    },
    "signal_type": {
      "type": "string",
      "enum": [
        "stated_opinion",
        "quote",
        "observed_behavior",
        "workflow_trace",
        "product_log",
        "transaction",
        "market_signal",
        "policy",
        "derived"
      ]
    },
    "signal": {
      "type": "string",
      "minLength": 1
    },
    "interpretation": {
      "type": "string",
      "minLength": 1
    },
    "decision_impact": {
      "type": "string",
      "minLength": 1
    },
    "evidence_tier": {
      "type": "string",
      "enum": [
        "t0",
        "t1",
        "t2",
        "t3",
        "t4"
      ]
    },
    "confidence_level": {
      "type": "string",
      "enum": [
        "very_low",
        "low",
        "medium",
        "high",
        "very_high"
      ]
    },
    "counter_signal": {
      "type": "string",
      "minLength": 1
    },
    "collected_at": {
      "type": "string",
      "format": "date-time"
    },
    "source_last_verified_at": {
      "type": "string",
      "format": "date-time"
    },
    "max_staleness_days": {
      "type": "integer",
      "minimum": 0
    }
  }
}