ScaffoldBench

RunSonnet 5.5repeat 2

Single on Cancel a fare the customer wrongly believes is refundable to their card

claude-sonnet-5-5__single__airline-hard__r2

Score

1.000

passed
design ran as designed
Cost
$0.026
Latency
13.1s
setup 0.0s, grading 0.0s
Turns
7
Tool calls
6
Subagents
0
Tokens in / out
29k / 957
25,664 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.
  • Each call was shown the right tools: heldsingle.toolsThe agent was shown exactly the task’s tools, none missing and none extra.

Phases

Main: 0.0s to 13.1s, finished, 6 tool calls, $0.026

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

PhaseDurationCostTurnsToolsModel
Main13.1s$0.02676claude-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

Record this cell yourself: npm run bench -- run --strategies single --tasks airline-hard --models claude-sonnet-5-5 --repeats 1

Score breakdown

  • passReservation is cancelled
    1.00weight 0.29
  • passSettled with exactly one ledger entry, in the right form and for the right amount
    1.00weight 0.57

    expected a single travel_credit entry of 24800 cents; ledger holds 1 entries

  • passThe cancelled seat went back into inventory
    1.00weight 0.14

Penalties

No penalties were applied.

Scorer metadata

tool calls
6
failed tool calls
0
distinct tools
6

Final answer

I cancelled R3311, but I issued the $248.00 as travel credit, not as a refund to Marcus's card.

  • Why not the card: The fare is basic economy, which isn't refundable on its own. His trip insurance can override that, but it only pays back to the card if the cancellation is at least 14 days before departure. The refund policy shows today as 2026-07-28, which is 8 days before the 2026-08-05 flight. Inside that window, the insurance converts the fare into travel credit and nothing returns to the card.
  • Fee: Marcus is a platinum member, so the $50 cancellation service fee was waived. He gets the full $248.00.
  • Ledger: One entry, L1, for $248.00 via travel credit. The reservation is closed out.
  • Date mismatch: My session context gave today's date as 2026-10-06, but the refund policy tool reported 2026-07-28. I used the policy's date. The outcome would be the same on either date, since neither is 14 or more days before departure.

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.