{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/waxell/main/json-schema/waxell-span-schema.json",
  "title": "Waxell Span",
  "description": "An OpenTelemetry-compatible span recorded inside an agent run (tool call, retrieval, decision, llm).",
  "type": "object",
  "properties": {
    "span_id": { "type": "string" },
    "parent_span_id": { "type": "string" },
    "run_id": { "type": "string", "format": "uuid" },
    "name": { "type": "string" },
    "kind": {
      "type": "string",
      "enum": ["tool", "retrieval", "decision", "llm", "custom"]
    },
    "attributes": { "type": "object", "additionalProperties": true },
    "start_time": { "type": "string", "format": "date-time" },
    "end_time": { "type": "string", "format": "date-time" }
  },
  "required": ["name", "kind"],
  "additionalProperties": false
}