{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://serkan.ai/standards/ai-usage/schema.json",
  "title": "AI Usage Standard (AIUS) v1.0 — frontmatter",
  "description": "Schema for the `ai` frontmatter object declared on every artifact published under AIUS.",
  "type": "object",
  "additionalProperties": false,
  "required": ["ideation", "research", "drafting", "editing", "code", "visuals"],
  "properties": {
    "ideation": { "$ref": "#/$defs/level" },
    "research": { "$ref": "#/$defs/level" },
    "drafting": { "$ref": "#/$defs/level" },
    "editing":  { "$ref": "#/$defs/level" },
    "code":     { "$ref": "#/$defs/level" },
    "visuals":  { "$ref": "#/$defs/level" },
    "models": {
      "type": "array",
      "items": { "type": "string", "minLength": 1 }
    },
    "aius_version": {
      "type": "string",
      "default": "1.0"
    }
  },
  "$defs": {
    "level": {
      "type": "string",
      "enum": ["none", "assist", "collab", "lead"]
    }
  },
  "allOf": [
    {
      "comment": "AIUS Article 5 — models[] non-empty when max(dims) >= 1",
      "if": {
        "anyOf": [
          { "properties": { "ideation": { "not": { "const": "none" } } } },
          { "properties": { "research": { "not": { "const": "none" } } } },
          { "properties": { "drafting": { "not": { "const": "none" } } } },
          { "properties": { "editing": { "not": { "const": "none" } } } },
          { "properties": { "code": { "not": { "const": "none" } } } },
          { "properties": { "visuals": { "not": { "const": "none" } } } }
        ]
      },
      "then": {
        "required": ["models"],
        "properties": {
          "models": { "type": "array", "minItems": 1 }
        }
      }
    }
  ]
}