{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "ForkBranchRequest",
  "description": "Requests a new playable branch rooted at an already committed story node.\n\nThe caller identifies the branch head it observed so the trusted runtime can\nreject a rewind racing with a newer turn. The new branch id is generated by\nthe runtime from these trusted inputs and is never supplied by the UI or the\nmodel.",
  "type": "object",
  "properties": {
    "actionId": {
      "type": "string"
    },
    "currentBranchId": {
      "type": "string"
    },
    "expectedCurrentNodeId": {
      "type": "string"
    },
    "sourceNodeId": {
      "type": "string"
    },
    "storyId": {
      "type": "string"
    }
  },
  "required": [
    "storyId",
    "currentBranchId",
    "expectedCurrentNodeId",
    "sourceNodeId",
    "actionId"
  ]
}