{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Skill frontmatter",
  "type": "object",
  "properties": {
    "name": {
      "description": "Display name of the skill. Must match the skill's directory name.",
      "type": [
        "string",
        "null"
      ]
    },
    "description": {
      "description": "Short summary of what the skill does. Required.",
      "type": "string"
    },
    "license": {
      "description": "License identifier for the skill.",
      "type": [
        "string",
        "null"
      ]
    },
    "compatibility": {
      "description": "Compatibility information for the skill.",
      "type": [
        "string",
        "null"
      ]
    },
    "metadata": {
      "description": "Free-form metadata as key-value pairs.",
      "type": [
        "object",
        "null"
      ],
      "additionalProperties": {
        "type": "string"
      }
    },
    "polytoken": {
      "anyOf": [
        {
          "const": true
        },
        {
          "$ref": "#/$defs/SkillPolytokenFrontMatter"
        }
      ]
    }
  },
  "required": [
    "description"
  ],
  "$defs": {
    "SkillPolytokenFrontMatter": {
      "description": "Polytoken-specific skill controls.",
      "type": "object",
      "properties": {
        "disable_model_invocation": {
          "description": "When true, the model cannot invoke this skill on its own; only explicit\nreferences load it.",
          "type": [
            "boolean",
            "null"
          ]
        },
        "tags": {
          "description": "Tags that group this skill for `tag!` references.",
          "type": [
            "array",
            "null"
          ],
          "items": {
            "type": "string"
          }
        }
      }
    }
  }
}