StreamEvent

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/StreamEvent",
  "title": "StreamEvent",
  "type": "object",
  "description": "A server-sent event emitted during streaming chat generation. Event types include stream-start, content-delta, citation-start, citation-end, tool-call-start, tool-call-delta, tool-call-end, and stream-end.",
  "properties": {
    "event_type": {
      "type": "string",
      "enum": [
        "stream-start",
        "content-delta",
        "citation-start",
        "citation-end",
        "tool-call-start",
        "tool-call-delta",
        "tool-call-end",
        "stream-end"
      ],
      "description": "The type of streaming event."
    },
    "delta": {
      "type": "object",
      "description": "The incremental content payload for delta events.",
      "properties": {
        "message": {
          "type": "object",
          "properties": {
            "content": {
              "type": "object",
              "properties": {
                "text": {
                  "type": "string",
                  "description": "The incremental text content."
                }
              }
            }
          }
        }
      }
    }
  }
}