ScaffoldBench

RunOpus 5.5repeat 2

Propose-select on Add checked bags and collect the right fee

claude-opus-5-5__propose-select__airline-easy__r2

Score

1.000

passed
design ran as designed
Cost
$0.342
Latency
46.0s
setup 0.0s, grading 0.0s
Turns
31
Tool calls
25
Subagents
3
Tokens in / out
93k / 6.4k
59,854 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

Proposal 1 (policy-first): 0.0s to 18.0s, finished, 6 tool calls, $0.075
Proposal 2 (state-first): 0.0s to 17.7s, finished, 7 tool calls, $0.075
Proposal 3 (outcome-first): 0.0s to 18.4s, finished, 6 tool calls, $0.075
Select: 18.4s to 29.6s, finished, 0 tool calls, $0.059
Execute: 29.6s to 46.0s, finished, 6 tool calls, $0.058

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

PhaseDurationCostTurnsToolsModel
Proposal 1 (policy-first)18.0s$0.07576claude-opus-5-5
Proposal 2 (state-first)17.7s$0.07587claude-opus-5-5
Proposal 3 (outcome-first)18.4s$0.07576claude-opus-5-5
Select11.2s$0.05920claude-opus-5-5
Execute16.4s$0.05876claude-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 propose-select --tasks airline-easy --models claude-opus-5-5 --repeats 1

Score breakdown

  • passReservation holds three checked bags and is otherwise untouched
    1.00weight 0.43

    checked_bags=3, status=confirmed

  • passExactly one baggage fee, for the bags beyond the free allowance
    1.00weight 0.57

    expected 4500 cents for 1 chargeable bag(s), charged 4500

Penalties

No penalties were applied.

Scorer metadata

tool calls
25
failed tool calls
0
distinct tools
9

Final answer

I added the two bags to R1042 and charged Rosa $45.00 for them.

What I changed:

  • R1042 now has 3 checked bags instead of 1. That's the most one booking can hold, so she can't add any more.
  • I charged one baggage fee of $45.00 (4500 cents) to R1042. It's the only charge on that booking.

Why it's $45 and not $120: Economy comes with 1 free bag and her Silver status adds 1 more, so 2 of her 3 bags are free. Only the third bag costs money, and the first bag over the allowance is $45. The $75 rate is for each bag after that, so it doesn't apply here.

Before changing anything, I re-checked the booking (confirmed, economy, 1 bag, flight AS420 from San Francisco to Seattle on 2026-08-11, still scheduled), her Silver tier, the baggage rules, and that no fees had been charged on R1042 yet. Everything matched the plan. Today's date here (2026-10-06) is after the flight date, but the airline system's own date is 2026-07-28 and still shows the flight as scheduled, so I went by the system date. I didn't touch the fare, cabin, flight, her passenger record or any other booking.

Message for Rosa: "You now have 3 checked bags on R1042, which is the most one booking can hold. Economy includes one free bag and your Silver status adds another, so you only pay for the third bag: $45.00."

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.