ScaffoldBench

RunSonnet 5.5repeat 2

Plan-execute-verify on Add checked bags and collect the right fee

claude-sonnet-5-5__plan-execute-verify__airline-easy__r2

Score

1.000

passed
design ran as designed
Cost
$0.068
Latency
24.7s
setup 0.0s, grading 0.0s
Turns
16
Tool calls
11
Subagents
0
Tokens in / out
51k / 2.2k
38,019 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 7.3s, finished, 0 tool calls, $0.012
Execute: 7.3s to 17.9s, finished, 7 tool calls, $0.031
Verify: 17.9s to 24.7s, finished, 4 tool calls, $0.026

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

PhaseDurationCostTurnsToolsModel
Plan7.3s$0.01220claude-sonnet-5-5
Execute10.6s$0.03187claude-sonnet-5-5
Verify6.7s$0.02664claude-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-verify --tasks airline-easy --models claude-sonnet-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
11
failed tool calls
0
distinct tools
7

Final answer

I added two checked bags to R1042, so Rosa now has 3, and charged her $45.00 for them.

  • Free allowance: She flies economy, which includes 1 free bag. Her Silver status adds 1 more, so she gets 2 free bags.
  • Bags and charge: She had 1 bag, and the reservation now holds 3, which is the maximum. Only the third bag is beyond her allowance. It is the first chargeable bag, at $45.00.
  • Ledger: I recorded one baggage_fee entry of $45.00 (ledger entry L1). The ledger was empty before, so nothing was double-charged.
  • Not re-read: I did not re-read the reservation afterward. The tools reported the bag count change (1 to 3) and the charge directly.
  • Flight date: The flight, AS420 SFO→SEA, is dated 2026-08-11, which is before today's date (2026-10-06). The system still lists it as scheduled, so I went ahead, but the date may be worth checking.

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.