{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://kitn.ai/schemas/card/card-envelope.schema.json",
  "title": "CardEnvelope",
  "description": "A card the agent/server asks the chat to render. `data` validates against the per-type schema.",
  "type": "object",
  "required": ["type", "id", "data"],
  "properties": {
    "type": { "type": "string", "minLength": 1 },
    "id": { "type": "string", "minLength": 1 },
    "data": {},
    "title": { "type": "string" }
  }
}