Sutura Case Lab

JavaScript repair

Recorded live result Fixed

Passed the required checks

The repair reproduced the failure, fixed it, and held the behavior the checks require.

Historical recorded result · A real off-by-one bug fails one test. Sutura must repair the code, not the test. · subject e724f3b22de79d6ab3f40cffa96de7776c256ce9 · 2026-09-17T14:08:32.715Z

Review the diff and the behavior tested before merging.

This result is a recorded live benchmark evaluation of the released Sutura version, not a run started from this page.

Outcome matches the expected outcome.

Failed commit and CI evidence

Placebo case repair-off-by-one: An exact page boundary returns one extra page. The repair must change page-count.js and keep the assertion.
Failing command: vitest run
Error excerpt: AssertionError: expected 3 to be 2 // Object.is equality
Repository local/fixture · run local-fixture · runtime node
Recorded workflow run

Nano diagnosis and confidence

Failure class

test-assertion

Confidence

97%

Signals

AssertionError
expected 3 to be 2
Object.is equality
mechanical:test-assertion
signature:\bexpected\b[^\n]*\b(?:to|but)\b[^\n]*\b(?:received|be|equal|match)\b

Diagnosis recovery

Initial diagnosis retained: test-assertion. Recovery: not-run — no-supported-recovery-signal.
Observed command: vitest run
Executed command: if [ -f pnpm-lock.yaml ]; then corepack pnpm exec sh -c 'vitest run'; elif [ -f yarn.lock ]; then corepack yarn exec sh -c 'vitest run'; else PATH="./node_modules/.bin:$PATH" sh -c 'vitest run'; fi
These bounded observations do not measure live repair quality.

Clean audit branch and Ultra verdict

Verdict: approved · policy default at local

Check	Result	Evidence
`deleted-test`	passed
`skipped-test`	passed
`pass-with-no-tests`	passed
`weakened-assertion`	passed
`loosened-type`	passed
`relaxed-config`	passed
`module-syntax`	passed
`llm-adjudication`	passed	The patch corrects the pageCount function from `Math.floor(items / size) + 1` to `Math.floor((items - 1) / size) + 1`, which fixes the off-by-one error causing the test to expect 2 but receive 3. The test 'keeps an exact final page' now passes without any modifications to the test suite, no skipped tests, no weakened assertions, and no changes to linting or type safety. The after log confirms the single test passes, indicating the diagnosed assertion failure is resolved.
`second-opinion`	passed	gpt-6-astra: skipped: Not configured: OPENAI_API_KEY absent
`typesafe-audit`	passed	jev-latest: skipped: Not configured: TYPESAFE_API_KEY absent
`policy-required-command`	passed	Passed 0 repository policy commands

The patch corrects the pageCount function from `Math.floor(items / size) + 1` to `Math.floor((items - 1) / size) + 1`, which fixes the off-by-one error causing the test to expect 2 but receive 3. The test 'keeps an exact final page' now passes without any modifications to the test suite, no skipped tests, no weakened assertions, and no changes to linting or type safety. The after log confirms the single test passes, indicating the diagnosed assertion failure is resolved.

Final outcome

Fixed Recorded live result

Sutura never merges a generated repair. A fixed result still needs human review.

Check a patch this page did not produce

This run did not record an exact failing commit and policy commit, so both are shown as placeholders. Verification is always tied to exact commits. A patch cannot ask for a more permissive policy by carrying one, and no green log is accepted in place of execution.

sutura verify \
  --case-dir <checkout> \
  --source-sha <failing commit> \
  --policy-base-sha <trusted policy commit> \
  --candidate-diff <patch file> \
  --failing-command diagnosed \
  --format json

The same route runs as a GitHub Action and needs no repository write access. Uploading a patch stays a command-line and Action route; this page never runs one.

Execution and cost detail

Release: v0.3.1 · Action e724f3b22de79d6ab3f40cffa96de7776c256ce9
Controller: e724f3b22de79d6ab3f40cffa96de7776c256ce9
Request: recorded-javascript-repair · 2026-09-17T14:30:57.361Z

ConTree search tree and branch status

Triage: real · reproduced 4/4 · stop reason failure-boundary · method sprt-p20-p80-a05-b05-v1

Node	Parent	Depth	Terminal reason	Test exit	Policy	Changed files	Diff bytes
`search-001`	root	1	passed	0	valid	1	293
`search-002`	root	1	passed	0	valid	1	300
`search-003`	root	1	open	1	valid	1	293

Super proposals and candidate patches

Candidate `repair-8e0798eb6849` · selected

Replace the controller-selected source excerpt.

Test exit 0 · held its result · node search-001 · Adaptive search passed at depth 1

diff --git a/page-count.js b/page-count.js
index 28f73e0..65f9eef 100644
--- a/page-count.js
+++ b/page-count.js
@@ -1 +1 @@
-export function pageCount(items, size) { return Math.floor(items / size) + 1; }
+export function pageCount(items, size) { return Math.floor((items - 1) / size) + 1; }

Candidate `repair-9b12d1fedabe`

Replace the controller-selected source excerpt.

Test exit 0 · held its result · node search-002 · Adaptive search passed at depth 1

diff --git a/page-count.js b/page-count.js
index 28f73e0..22b843b 100644
--- a/page-count.js
+++ b/page-count.js
@@ -1 +1 @@
-export function pageCount(items, size) { return Math.floor(items / size) + 1; }
+export function pageCount(items, size) { return items === 0 ? 0 : Math.ceil(items / size); }

Rejected patches and rejection reasons

Candidate	Result	Test exit	Note
`repair-9b12d1fedabe`	held	0	Adaptive search passed at depth 1

Token cost, provider cost, latency, and sandbox operations

Inference cost: USD 0.008736
Sandbox cost: USD 0.084121
Elapsed: 112.4 s
CPU time: 7.65 s
Peak memory: 240 MiB
Sandbox stages: 22 (12 with an operation id)

Role	Calls	Input tokens	Output tokens	Cost
nano	1	1742	403	USD 0.000201
super	3	1503	100	USD 0.000541
ultra	2	4646	257	USD 0.007994

Links

Recorded from docs/demo/placebo-v0.3.1-live-2026-09-17.json (result hash 4ff3693ba6bb…) at 2026-09-17T14:08:32.715Z, subject e724f3b22de79d6ab3f40cffa96de7776c256ce9.

Result hash 092ee0e2071fc8d80785ccf89a92dfbb7091551578552a04b937501a7645163f