{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "ajaxRunCanaryStep",
  "description": "Adaptive canary ladder step request from view_updater_canary_ladder.js to Ajax_CanaryLadder.php (Bruno timeout cause matrix, coverage req. 7).",
  "type": "object",
  "required": ["nonce", "canaryStep", "requestId"],
  "additionalProperties": false,
  "properties": {
    "nonce": { "type": "string", "minLength": 1 },
    "canaryStep": {
      "type": "string",
      "enum": ["concurrent_control", "baseline_control", "auth_only", "post_limiter", "summary", "size_target", "size_probe", "inert", "compress_on", "compress_off", "stream", "interpret"]
    },
    "requestId": { "type": "string", "minLength": 1 },
    "retryParentId": { "type": "string" },
    "sessionId": { "type": "string" },
    "subpage": { "type": "string" },
    "payloadBytes": { "type": "string" },
    "payloadVariant": { "type": "string", "enum": ["compressible", "incompressible"] },
    "payloadRungPercent": { "type": "string", "pattern": "^([1-9]|[1-9][0-9]|100)$" },
    "targetBytesSource": { "type": "string", "enum": ["session_json_encode", "browser_response", "default_unavailable"] },
    "baselineOrdinal": { "type": "string" },
    "controlForRequestId": { "type": "string" },
    "observations": { "type": "string" },
    "realRequestFailed": { "type": "string" },
    "canaryStepReceipts": {
      "type": "string",
      "description": "JSON array of the browser's receipt confirmations for ladder steps that finished before this request, riding forward until the server has demonstrably received them (gap-hunt iteration 2 gap GE). Each record includes step/request identity, outcome/timing, Content-Encoding, transferred/encoded/decoded body sizes, resource-timing state, and size-probe variant/rung/target provenance. Absent on the first request of a run."
    }
  }
}