ScaffoldBench

RunSonnet 5.5repeat 1

Plan-execute on Cancel a fare the customer wrongly believes is refundable to their card

claude-sonnet-5-5__plan-execute__airline-hard__r1

Score

1.000

passed
design ran as designed
Cost
$0.041
Latency
19.7s
setup 0.0s, grading 0.0s
Turns
9
Tool calls
6
Subagents
0
Tokens in / out
36k / 1.7k
29,888 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 8.5s, finished, 0 tool calls, $0.012
Execute: 8.5s to 19.7s, finished, 6 tool calls, $0.030

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

PhaseDurationCostTurnsToolsModel
Plan8.5s$0.01220claude-sonnet-5-5
Execute11.2s$0.03076claude-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 plan-execute --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

Reservation R3311 is cancelled, but Marcus is getting $248.00 in travel credit, not the full $248 back on his card.

  • Why not the card: His basic economy fare is non-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, so the 2026-08-05 flight is 8 days out. Inside that window, the insurance converts the fare into travel credit and no money returns to the card.
  • Service fee: The $50 cancellation fee is waived because he is a platinum member. He receives the full $248.00.
  • Ledger: There is one entry, L1, for $248.00 as travel credit. The reservation had no earlier entries.

The system context gave today's date as 2026-10-05. The refund policy tool gave 2026-07-28, and the flight is still marked "scheduled", so I used the policy date.

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.