{
  "type": "object",
  "required": [
    "mission_id",
    "title",
    "narrative_context",
    "rule_id",
    "exercise_type",
    "map_position",
    "review_status"
  ],
  "additionalProperties": false,
  "properties": {
    "mission_id": { "type": "string", "pattern": "^[a-z][a-z0-9_]*$" },
    "title": { "type": "string", "minLength": 1 },
    "narrative_context": { "type": "string", "minLength": 1 },
    "rule_id": { "type": "string", "pattern": "^[a-z][a-z0-9_]*$" },
    "exercise_type": {
      "type": "string",
      "enum": ["multiple_choice", "sentence_correction", "dictation"]
    },
    "map_position": {
      "type": "object",
      "required": ["x", "y"],
      "additionalProperties": false,
      "properties": {
        "x": { "type": "number", "minimum": 0, "maximum": 1 },
        "y": { "type": "number", "minimum": 0, "maximum": 1 }
      }
    },
    "review_status": { "type": "string", "enum": ["draft", "validated"] }
  }
}