{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://hermes.bstein.dev/contracts/hux/v1/artifact.schema.json",
  "title": "HUX artifact",
  "description": "Typed, versioned output (HUX-04). Content lives behind content_ref; versions are immutable and diffable; lineage records what an artifact was derived from; promotion copies a version into a project.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema",
    "id",
    "owner",
    "type",
    "title",
    "current_version",
    "versions",
    "sensitivity",
    "created_at",
    "updated_at",
    "revision",
    "access"
  ],
  "properties": {
    "schema": {
      "const": "hux.artifact.v1"
    },
    "id": {
      "$ref": "common.schema.json#/$defs/id"
    },
    "owner": {
      "$ref": "common.schema.json#/$defs/user_ref"
    },
    "conversation_id": {
      "$ref": "common.schema.json#/$defs/id"
    },
    "project_id": {
      "$ref": "common.schema.json#/$defs/id"
    },
    "type": {
      "type": "string",
      "enum": [
        "markdown",
        "code",
        "html",
        "svg",
        "image",
        "json",
        "csv",
        "document",
        "audio"
      ]
    },
    "language": {
      "type": "string",
      "maxLength": 40
    },
    "title": {
      "type": "string",
      "minLength": 1,
      "maxLength": 200
    },
    "current_version": {
      "type": "integer",
      "minimum": 1
    },
    "versions": {
      "type": "array",
      "minItems": 1,
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "version",
          "created_at",
          "created_by",
          "content_ref"
        ],
        "properties": {
          "version": {
            "type": "integer",
            "minimum": 1
          },
          "created_at": {
            "$ref": "common.schema.json#/$defs/timestamp"
          },
          "created_by": {
            "$ref": "common.schema.json#/$defs/actor"
          },
          "message_id": {
            "type": "string",
            "maxLength": 120
          },
          "content_ref": {
            "type": "object",
            "additionalProperties": false,
            "required": [
              "hash",
              "bytes",
              "mime"
            ],
            "properties": {
              "hash": {
                "$ref": "common.schema.json#/$defs/sha256"
              },
              "bytes": {
                "type": "integer",
                "minimum": 0
              },
              "mime": {
                "type": "string",
                "maxLength": 120
              }
            }
          },
          "diff_from": {
            "type": "integer",
            "minimum": 1
          },
          "lineage": {
            "type": "object",
            "additionalProperties": false,
            "required": [
              "artifact_id",
              "version"
            ],
            "properties": {
              "artifact_id": {
                "$ref": "common.schema.json#/$defs/id"
              },
              "version": {
                "type": "integer",
                "minimum": 1
              }
            }
          },
          "note": {
            "type": "string",
            "maxLength": 200
          }
        }
      }
    },
    "promotion": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "project_id",
        "version",
        "at"
      ],
      "properties": {
        "project_id": {
          "$ref": "common.schema.json#/$defs/id"
        },
        "version": {
          "type": "integer",
          "minimum": 1
        },
        "at": {
          "$ref": "common.schema.json#/$defs/timestamp"
        }
      }
    },
    "sensitivity": {
      "$ref": "common.schema.json#/$defs/sensitivity"
    },
    "created_at": {
      "$ref": "common.schema.json#/$defs/timestamp"
    },
    "updated_at": {
      "$ref": "common.schema.json#/$defs/timestamp"
    },
    "revision": {
      "$ref": "common.schema.json#/$defs/revision"
    },
    "access": {
      "type": "object",
      "description": "Owner-only unless a share token is minted; shares are read-only and expire.",
      "additionalProperties": false,
      "required": [
        "mode"
      ],
      "properties": {
        "mode": {
          "type": "string",
          "enum": [
            "owner",
            "shared_readonly"
          ]
        },
        "share_expires_at": {
          "$ref": "common.schema.json#/$defs/timestamp"
        }
      }
    }
  }
}