{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://promptkit-core.ochotzas.com/schemas/prompt.schema.json",
  "title": "PromptKit prompt file",
  "type": "object",
  "required": ["name", "description"],
  "anyOf": [
    { "required": ["template"] },
    { "required": ["messages"] }
  ],
  "properties": {
    "name": {
      "type": "string",
      "minLength": 1,
      "description": "Unique identifier for the prompt."
    },
    "description": {
      "type": "string",
      "description": "Human-readable description of what the prompt does."
    },
    "version": {
      "type": "string",
      "default": "0.1.0",
      "description": "Advisory version for humans. Identity is the fingerprint, not this."
    },
    "template": {
      "type": "string",
      "description": "Single Jinja2 template, loaded as one user message. Legacy form; prefer 'messages'."
    },
    "messages": {
      "type": "array",
      "minItems": 1,
      "description": "Ordered message templates.",
      "items": {
        "oneOf": [
          { "type": "string" },
          {
            "type": "object",
            "required": ["template"],
            "properties": {
              "role": {
                "type": "string",
                "enum": ["system", "user", "assistant"],
                "default": "user"
              },
              "template": { "type": "string" }
            },
            "additionalProperties": false
          },
          {
            "type": "object",
            "maxProperties": 1,
            "properties": {
              "system": { "type": "string" },
              "user": { "type": "string" },
              "assistant": { "type": "string" }
            },
            "additionalProperties": false
          }
        ]
      }
    },
    "input_schema": {
      "type": "object",
      "description": "Either a mapping of field name to type string (str, int, float, bool, list, dict, optionally suffixed with ' | None'), or a JSON Schema object.",
      "additionalProperties": true
    },
    "output_schema": {
      "type": "object",
      "description": "JSON Schema describing the expected model output. Must be an object schema.",
      "additionalProperties": true
    },
    "metadata": {
      "type": "object",
      "description": "Non-executable context. Never changes rendering behaviour.",
      "properties": {
        "tags": { "type": "array", "items": { "type": "string" } },
        "author": { "type": "string" },
        "model": { "type": "string" },
        "temperature": { "type": "number", "minimum": 0 }
      },
      "additionalProperties": true
    }
  },
  "additionalProperties": false
}