RunSonnet 5.5repeat 1

Propose-select on Run the major-incident runbook for a CI outage

claude-sonnet-5-5__propose-select__support-major-incident__r1

Score

0.820

wrong answer

design ran as designed

Cost: $0.363
Latency: 1m 6s; setup 0.0s, grading 0.0s
Turns: 111
Tool calls: 105
Subagents: 3
Tokens in / out: 274k / 15k; 225,426 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.
All three proposers ran: heldpropose-select.proposalsThree proposers ran in parallel, each from its own angle, and none was starved while another ran.
The selector chose: heldpropose-select.selectionThe selector picked a proposal by a valid number, read from its schema reply and not a default.
Each call was shown the right tools: heldpropose-select.toolsEach proposer was shown the read-only tools, the selector none, and the executor the full toolset.

Phases

Spend$0.363

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

Phase	Duration	Cost	Turns	Tools	Model
Proposal 1 (policy-first)	26.9s	$0.081	29	28	claude-sonnet-5-5
Proposal 2 (state-first)	22.0s	$0.067	25	24	claude-sonnet-5-5
Proposal 3 (outcome-first)	27.2s	$0.071	25	24	claude-sonnet-5-5
Select	13.8s	$0.042	2	0	claude-sonnet-5-5
Execute	24.5s	$0.102	30	29	claude-sonnet-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

A gate that blocked the right moveGated-execute · Haiku 4.5
Three proposals beat one agentPropose-select · Haiku 4.5
A verifier that earned its keepPlan-execute-verify · Sonnet 5.5
A revision that did not helpPlan-execute-verify · Haiku 4.5
The control, missing a stepSingle · Haiku 4.5

Record this cell yourself: npm run bench -- run --strategies propose-select --tasks support-major-incident --models claude-sonnet-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)
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
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: 105
failed tool calls: 0
distinct tools: 20

Final answer

I ran the KB-40 major-incident runbook for the build-pipeline outage as INC-1. The state matched the plan, so I made no changes to it.

Runbook: KB-40 is current and KB-39 is superseded. I used none of the KB-39 steps.
Incident: I opened INC-1 before contacting anyone.
Commander: I paged E-401 Priya Raman, who is on call for incident-command now, and only her. She is now incident commander.
Linked reports: T-3101, T-3102, T-3103, T-3104, T-3105, T-3106 and T-3109 are linked to INC-1. I did not merge them.
Left alone: T-3107 (a flaky test that passes on retry), T-3108 (a local Xcode link failure) and the closed T-3090.
Severity: all seven linked reports are now sev1, per the matrix (build-pipeline, company-wide). T-3105 is a single-user report, but its job never gets a runner, so I included it.
Deadlines: the five existing deadlines are unchanged. T-3106 and T-3109 had none, so each got 16:20Z, which is triage at 15:20Z plus the 60-minute sev1 target.
Comms lead: E-801 Mia Laurent is on sick leave on 30–31 March, so cover goes to the backup rotation, comms-secondary. I named E-803 Elif Demir, who is on call there now. This was a role assignment, not a page.
Status update: posted at 15:20Z: "Impact: all engineering teams company-wide; CI builds failing, no healthy runners. Started: 14:52 UTC. Next update: 15:50 UTC." The start time is the earliest report, T-3101, and the next update is due within 30 minutes of posting.
Postmortem: T-3115 is linked to INC-1 and due 2026-04-08 17:00Z, the close of the fifth business day after 30 March. Good Friday (3 April) and Easter Monday (6 April) are company holidays and don't count.

Two things for you to do:

Next update: it is due at 15:50Z.
Postmortem severity: T-3115 shows severity "unset". The runbook doesn't ask for a severity on it, so I left it.

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.