{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://github.com/KryptosAI/mcp-observatory/schemas/diff-artifact.schema.json",
  "title": "MCP Observatory Diff Artifact",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "artifactType",
    "schemaVersion",
    "gate",
    "baseRunId",
    "headRunId",
    "createdAt",
    "summary",
    "regressions",
    "recoveries",
    "unchanged",
    "added",
    "removed"
  ],
  "properties": {
    "artifactType": {
      "const": "diff"
    },
    "schemaVersion": {
      "const": "1.0.0"
    },
    "gate": {
      "$ref": "#/definitions/gate"
    },
    "baseRunId": {
      "type": "string"
    },
    "headRunId": {
      "type": "string"
    },
    "createdAt": {
      "type": "string"
    },
    "summary": {
      "$ref": "#/definitions/diffSummary"
    },
    "regressions": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/diffEntry"
      }
    },
    "recoveries": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/diffEntry"
      }
    },
    "unchanged": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/diffEntry"
      }
    },
    "added": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/diffEntry"
      }
    },
    "removed": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/diffEntry"
      }
    }
  },
  "definitions": {
    "gate": {
      "type": "string",
      "enum": ["pass", "fail"]
    },
    "checkStatus": {
      "type": "string",
      "enum": ["pass", "fail", "partial", "unsupported", "flaky", "skipped"]
    },
    "checkId": {
      "type": "string",
      "enum": ["tools", "prompts", "resources"]
    },
    "diffEntry": {
      "type": "object",
      "additionalProperties": false,
      "required": ["id", "capability", "message"],
      "properties": {
        "id": {
          "$ref": "#/definitions/checkId"
        },
        "capability": {
          "$ref": "#/definitions/checkId"
        },
        "fromStatus": {
          "$ref": "#/definitions/checkStatus"
        },
        "toStatus": {
          "$ref": "#/definitions/checkStatus"
        },
        "message": {
          "type": "string"
        }
      }
    },
    "diffSummary": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "regressions",
        "recoveries",
        "unchanged",
        "added",
        "removed",
        "gate"
      ],
      "properties": {
        "regressions": { "type": "integer", "minimum": 0 },
        "recoveries": { "type": "integer", "minimum": 0 },
        "unchanged": { "type": "integer", "minimum": 0 },
        "added": { "type": "integer", "minimum": 0 },
        "removed": { "type": "integer", "minimum": 0 },
        "gate": {
          "$ref": "#/definitions/gate"
        }
      }
    }
  }
}