ScaffoldBench

RunHaiku 4.5repeat 1

Plan-execute on Run the major-incident runbook for a CI outage

claude-haiku-4-5-20251001__plan-execute__support-major-incident__r1

Score

0.740

wrong answer
design ran as designed
Cost
$0.159
Latency
3m 6s
setup 0.0s, grading 0.0s
Turns
40
Tool calls
37
Subagents
0
Tokens in / out
350k / 17k
327,584 read from cache

Did the design run?

every check held
  • Run completed: heldharness.run-completedThe environment was built, the architecture returned and grading finished, none of them throwing.
  • No API failures: heldharness.apiNo model call failed at the API.
  • Every call ended: heldharness.calls-endedEvery call ended with a result, or was stopped by the run's own limits.
  • No harness tool denied: heldharness.harness-toolsThe sandbox guard never denied a harness tool, nor a tool the session itself offered.
  • Tool servers connected: heldharness.mcp-connectedEvery tool server the harness gave a call was connected when the session started.
  • No foreign tool servers: heldharness.mcp-hermeticNo call loaded a tool server the harness did not give it.
  • Builtin tools: heldharness.builtin-toolsA check recorded with the run.
  • Structured replies arrived: heldharness.structured-outputEvery call that asked for structured output and ran to the end got it.
  • No silent fallbacks: heldharness.not-degradedNo phase fell back on a default (an empty plan, a default winner) instead of its output.
  • The plan was a plan: heldplan-execute.planThe planner’s reply was read through its schema and held at least one step.
  • Each call was shown the right tools: heldplan-execute.toolsThe planner was shown no tools and the executor the task’s full toolset.

Phases

Plan: 0.0s to 56.0s, finished, 0 tool calls, $0.029
Execute: 56.0s to 3m 6s, finished, 37 tool calls, $0.130

Drawn from the phase records: timing and cost per call, no tool calls or messages.

PhaseDurationCostTurnsToolsModel
Plan56.0s$0.02920claude-haiku-4-5-20251001
Execute2m 10s$0.1303837claude-haiku-4-5-20251001

The call-by-call replay is not published for this run. Traces are large, so the repository keeps 9 of this run set’s 900 and leaves the rest out; the score, phases and final answer on this page come from the committed run record.

Runs you can replay

Record this cell yourself: npm run bench -- run --strategies plan-execute --tasks support-major-incident --models claude-haiku-4-5-20251001 --repeats 1

Score breakdown

  • passAn incident is open for the build pipeline
    1.00weight 0.04
  • passThe incident-command engineer on call now commands the incident
    1.00weight 0.08

    commander=E-401 (expected E-401)

  • passThe commander was paged
    1.00weight 0.04
  • passT-3101 linked to the incident
    1.00weight 0.04
  • passT-3101 kept open, raised to sev1 with its deadline intact
    1.00weight 0.02

    status=open severity=sev1 due=2026-03-30T18:52:00Z (expected sev1, 2026-03-30T18:52:00Z)

  • passT-3102 linked to the incident
    1.00weight 0.04
  • passT-3102 kept open, raised to sev1 with its deadline intact
    1.00weight 0.02

    status=open severity=sev1 due=2026-03-30T18:58:00Z (expected sev1, 2026-03-30T18:58:00Z)

  • passT-3103 linked to the incident
    1.00weight 0.04
  • passT-3103 kept open, raised to sev1 with its deadline intact
    1.00weight 0.02

    status=open severity=sev1 due=2026-03-30T19:01:00Z (expected sev1, 2026-03-30T19:01:00Z)

  • passT-3104 linked to the incident
    1.00weight 0.04
  • passT-3104 kept open, raised to sev1 with its deadline intact
    1.00weight 0.02

    status=open severity=sev1 due=2026-03-31T15:05:00Z (expected sev1, 2026-03-31T15:05:00Z)

  • passT-3105 linked to the incident
    1.00weight 0.04
  • passT-3105 kept open, raised to sev1 with its deadline intact
    1.00weight 0.02

    status=open severity=sev1 due=2026-04-01T15:07:00Z (expected sev1, 2026-04-01T15:07:00Z)

  • passT-3106 linked to the incident
    1.00weight 0.04
  • passT-3106 kept open, raised to sev1 with its deadline intact
    1.00weight 0.02

    status=new severity=sev1 due=2026-03-30T16:20:00Z (expected sev1, 2026-03-30T16:20:00Z)

  • passT-3109 linked to the incident
    1.00weight 0.04
  • passT-3109 kept open, raised to sev1 with its deadline intact
    1.00weight 0.02

    status=new severity=sev1 due=2026-03-30T16:20:00Z (expected sev1, 2026-03-30T16:20:00Z)

  • failT-3112 linked to the incident
    0.00weight 0.04
  • failT-3112 kept open, raised to sev1 with its deadline intact
    0.00weight 0.02

    status=new severity=unset due=- (expected sev1, 2026-03-30T16:20:00Z)

  • failT-3113 linked to the incident
    0.00weight 0.04
  • failT-3113 kept open, raised to sev1 with its deadline intact
    0.00weight 0.02

    status=open severity=sev3 due=2026-03-31T15:13:00Z (expected sev1, 2026-03-31T15:13:00Z)

  • failT-3114 linked to the incident
    0.00weight 0.04
  • failT-3114 kept open, raised to sev1 with its deadline intact
    0.00weight 0.02

    status=open severity=sev3 due=2026-03-31T15:16:00Z (expected sev1, 2026-03-31T15:16:00Z)

  • passThe engineer covering comms right now is the communications lead
    1.00weight 0.08

    comms=E-803 (expected E-803)

  • passA status update in the runbook form, with the next update due within 30 minutes
    1.00weight 0.08
  • failA postmortem ticket for the service, linked to the incident, due at close of business five business days on
    0.00weight 0.08

    T-3115 due=2026-04-07T17:00:00Z

Penalties

No penalties were applied.

Scorer metadata

tool calls
37
failed tool calls
0
distinct tools
18

Final answer

MAJOR INCIDENT RESPONSE COMPLETE

I have successfully taken charge of the company-wide build pipeline outage and established incident command following KB-40 (the binding major-incident runbook). Here's what has been accomplished:

Incident Established: INC-1

  • Title: Build pipeline infrastructure failure: no runners available
  • Service: build-pipeline
  • Status: Active (opened 2026-03-30T15:20:00Z)

Command Structure Activated

  • Incident Commander: E-401 Priya Raman

    • Paged immediately at 15:20 UTC (page delivered without delay)
    • On call until 16:00 UTC, successor E-402 will cover escalations after

  • Communications Lead: E-803 Elif Demir

    • Assigned from backup rotation (comms-secondary) per handbook policy
    • Primary (E-801) is on sick leave today and cannot hold incident roles
    • On call until 20:00 UTC

Outage Reports Triaged & Consolidated

All 7 open reports of this outage linked to INC-1:

  • T-3101: All CI builds failing: no runners available (first report, 14:52 UTC)
  • T-3102: Mobile builds stuck in the queue
  • T-3103: Pipeline never starts
  • T-3104: Builds hang at "waiting for runner"
  • T-3105: Cannot trigger a build for my branch
  • T-3106: CI completely down (automated alert)
  • T-3109: Release pipeline blocked: no runners

All escalated to sev1 (company-wide impact per escalation matrix), with deadlines committed per response targets.

Postmortem Scheduled

  • T-3115: Postmortem due 2026-04-07T17:00:00Z (5 business days, accounting for Good Friday 04-03 and Easter Monday 04-06)

Status Updates Active

  • First update posted: "Impact: Company-wide CI outage - all build pipelines down, no runners available. Started: 14:52 UTC. Next update: 15:50 UTC."
  • Next update due in 30 minutes per runbook requirements

The incident is now fully operationalized with proper escalation routing, dedicated incident leadership, and continuous status communication to the company.

Provenance of the numbers on this page

run set
scaffold-or-scale-v1
models
Haiku 4.5, Sonnet 5.5, Opus 5.5
effort
high
repeats
2
fixtures
replay
runs
900 / 900
strategy cost
$354.44
judge cost
$9.19
wall clock
9h 48m
git
fce5807b2d

Cost excludes judge calls, which are tracked separately so a scoring model never flatters or penalises an architecture. Every figure on this site is read from results/ at build time.