{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://nexus-agent-runs.netlify.app/schemas/step.schema.json",
  "title": "Open Agent Run: step journal line (oar/0.1, oar/0.2)",
  "type": "object",
  "required": ["runId", "seq", "type", "detail", "at"],
  "properties": {
    "runId": { "type": "string", "pattern": "^[A-Za-z0-9_-]+$" },
    "seq": { "type": "integer", "minimum": 1 },
    "type": {
      "enum": [
        "run_created", "llm_call", "llm_response", "tool_execution",
        "approval_requested", "approval_decision", "run_finished"
      ]
    },
    "detail": { "type": "object" },
    "at": { "type": "string" }
  }
}