{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/Rul1an/assay/main/docs/experiments/runner-vs-otel-overhead-2026-05/schema/runner-phase-timing-v0.schema.json",
  "title": "Runner phase timing diagnostics v0",
  "description": "Experiment-scoped phase timing side-log emitted by assay runner-spike run --phase-timing-log. This is not a Runner archive contract.",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema",
    "run_id",
    "agent_shim",
    "phases_ms",
    "exit_code",
    "signal",
    "error"
  ],
  "properties": {
    "schema": {
      "const": "assay.experiment.runner_phase_timing.v0"
    },
    "run_id": {
      "type": "string",
      "minLength": 1
    },
    "agent_shim": {
      "type": "string",
      "minLength": 1
    },
    "phases_ms": {
      "$ref": "#/$defs/phase_timings"
    },
    "exit_code": {
      "type": [
        "integer",
        "null"
      ],
      "minimum": 0
    },
    "signal": {
      "type": [
        "integer",
        "null"
      ],
      "minimum": 0
    },
    "error": {
      "type": [
        "string",
        "null"
      ]
    }
  },
  "$defs": {
    "phase_ms": {
      "type": "number",
      "minimum": 0
    },
    "phase_timings": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "preflight_ms": {
          "$ref": "#/$defs/phase_ms"
        },
        "cgroup_prepare_ms": {
          "$ref": "#/$defs/phase_ms"
        },
        "monitor_attach_ms": {
          "$ref": "#/$defs/phase_ms"
        },
        "child_spawn_ms": {
          "$ref": "#/$defs/phase_ms"
        },
        "child_runtime_ms": {
          "$ref": "#/$defs/phase_ms"
        },
        "event_flush_ms": {
          "$ref": "#/$defs/phase_ms"
        },
        "archive_write_ms": {
          "$ref": "#/$defs/phase_ms"
        }
      }
    }
  }
}