{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://bare-os.dev/schemas/boot-trace-line.schema.json",
  "title": "Bare OS kernel boot trace JSON line (stderr, BARE_OS_BOOT_TRACE=json)",
  "type": "object",
  "required": ["phase"],
  "additionalProperties": true,
  "properties": {
    "phase": { "type": "string" },
    "ok": { "type": "boolean" },
    "ms": { "type": "number" },
    "error": { "type": "string" },
    "subphaseDetail": {
      "type": "string",
      "maxLength": 512,
      "description": "Optional capped detail string for kernel.d / init.d traces"
    },
    "extensionGraphCycleClass": {
      "type": "string",
      "description": "When extension dependency graph has a cycle (operator-facing class)"
    },
    "extensionListDiffHash8": {
      "type": "string",
      "maxLength": 16,
      "description": "Truncated non-crypto hash of extension list after hot reload"
    },
    "offlineLkgStaleSubreason": {
      "type": "string",
      "description": "Stale manifest sub-reason for offline LKG boot traces"
    }
  }
}