ScaffoldBench

RunOpus 5.5repeat 1

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

claude-opus-5-5__plan-execute-verify__support-major-incident__r1

Score

0.460

wrong answer
design ran as designed
Cost
$0.786
Latency
3m 4s
setup 0.0s, grading 0.0s
Turns
111
Tool calls
103
Subagents
0
Tokens in / out
584k / 16k
531,801 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-verify.planThe planner’s reply was read through its schema and held at least one step.
  • Every verdict was read: heldplan-execute-verify.verdictsEvery review round ended with a verdict read from the schema reply, not a default.
  • The loop did what its verdicts said: heldplan-execute-verify.loopEvery verdict that called for a revision got one, and nothing was revised without such a verdict.
  • Each call was shown the right tools: heldplan-execute-verify.toolsThe planner was shown no tools, the verifier the read-only ones, and the executor and reviser the full toolset.

Phases

Plan: 0.0s to 23.9s, finished, 0 tool calls, $0.046
Execute: 23.9s to 1m 58s, finished, 50 tool calls, $0.402
Verify: 1m 58s to 2m 21s, finished, 20 tool calls, $0.124
Revise (round 1): 2m 21s to 2m 34s, finished, 4 tool calls, $0.059
Verify revision 1: 2m 34s to 3m 4s, finished, 29 tool calls, $0.155

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

PhaseDurationCostTurnsToolsModel
Plan23.9s$0.04620claude-opus-5-5
Execute1m 34s$0.4025150claude-opus-5-5
Verify23.0s$0.1242220claude-opus-5-5
Revise (round 1)13.1s$0.05954claude-opus-5-5
Verify revision 129.7s$0.1553129claude-opus-5-5

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-verify --tasks support-major-incident --models claude-opus-5-5 --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)

  • failT-3102 linked to the incident
    0.00weight 0.04
  • failT-3102 kept open, raised to sev1 with its deadline intact
    0.00weight 0.02

    status=merged severity=sev2 due=2026-03-30T18:58:00Z (expected sev1, 2026-03-30T18:58:00Z)

  • failT-3103 linked to the incident
    0.00weight 0.04
  • failT-3103 kept open, raised to sev1 with its deadline intact
    0.00weight 0.02

    status=merged severity=sev2 due=2026-03-30T19:01:00Z (expected sev1, 2026-03-30T19:01:00Z)

  • failT-3104 linked to the incident
    0.00weight 0.04
  • failT-3104 kept open, raised to sev1 with its deadline intact
    0.00weight 0.02

    status=merged severity=sev3 due=2026-03-31T15:05:00Z (expected sev1, 2026-03-31T15:05:00Z)

  • failT-3105 linked to the incident
    0.00weight 0.04
  • failT-3105 kept open, raised to sev1 with its deadline intact
    0.00weight 0.02

    status=merged severity=sev4 due=2026-04-01T15:07:00Z (expected sev1, 2026-04-01T15:07:00Z)

  • failT-3106 linked to the incident
    0.00weight 0.04
  • failT-3106 kept open, raised to sev1 with its deadline intact
    0.00weight 0.02

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

  • failT-3109 linked to the incident
    0.00weight 0.04
  • failT-3109 kept open, raised to sev1 with its deadline intact
    0.00weight 0.02

    status=merged severity=unset due=- (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=merged 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=merged 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=merged 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
  • passA postmortem ticket for the service, linked to the incident, due at close of business five business days on
    1.00weight 0.08

    T-3115 due=2026-04-08T17:00:00Z

Penalties

No penalties were applied.

Scorer metadata

tool calls
103
failed tool calls
4
distinct tools
19

Final answer

I've fixed the issue the verifier found: T-3112 is now merged into T-3101, so INC-1 covers it.

Why it belonged in the outage: T-3112 ("Deploy jobs failing everywhere") is an automated build-pipeline alert with company-wide impact, opened at 15:20. It reports that every deploy job is waiting for a runner, which is the same runner outage as T-3101. It had been left as a new ticket with no severity, deadline, assignee or incident link, and my earlier summary missed it.

What I changed:

  • Merged T-3112 into T-3101, which stays the survivor because it is the earliest report. Through the merge, T-3112 is now covered by INC-1 and handled at sev1 under T-3101, which meets steps 3 and 4 of the KB-40 runbook.
  • Kept T-3101's deadline at 2026-03-30 18:52 UTC. T-3112 had no deadline, so 18:52 is still the earliest one promised on any ticket in the set.
  • Added a comment on T-3101 recording the merge and why the deadline didn't change.

Nothing else from the earlier work changed.

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.