finding(test-infra): check-side-effects-array.test.ts reds on any tree where `packages/layout/dist/index.umd.cjs` exists — a third instance of objectui#6893's class

[os-tesla]

Found while working objectui#7479 (PR objectui#9122). Filed unassigned and NOT fixed there — that card is scoped to the i18n locale catalogues, and this gate test is neither in its diff nor in its blast radius (proof below). Generated by an agent seat; this paragraph is the attribution, deliberately written as prose rather than as a footer block.

What

One case in scripts/__tests__/check-side-effects-array.test.ts changes verdict with the tree's BUILD STATE:

describe('the real workspace — the population this widening was measured against')
  it('finds a stylesheet subpath and a second build format, and no second entry POINT')

It asserts

expect(results.flatMap((r) => r.entryForms.flatMap((e) => e.alternateFormats)).length)
  .toBeGreaterThan(0);

alternateFormats is the set of published forms classifyEntryForms could classify as neither a module nor an asset — and the branch that decides that calls existsInPackage(form), i.e. fs.existsSync against the package directory. Two packages declare a sideEffects ARRAY and are therefore the whole population: @object-ui/app-shell and @object-ui/layout. The only "second build format" among them is @object-ui/layout's "require": "./dist/index.umd.cjs".

⇒ on an UNBUILT tree that file is absent, classifies as unmapped, and alternateFormats is 1. On a BUILT tree it exists, classifies as an asset, and alternateFormats is 0 — the assertion reds.

Reproduction, measured both ways on one tree

Container tree at objectui#9122's head, after pnpm turbo run build --filter='./packages/*':

pnpm exec vitest run scripts/__tests__/check-side-effects-array.test.ts
  Tests  1 failed | 43 passed (44)
  AssertionError: expected 0 to be greater than 0   (line 720)

Then, with the single gitignored artifact moved aside and nothing else changed:

mv packages/layout/dist/index.umd.cjs /tmp/  &&  pnpm exec vitest run scripts/__tests__/check-side-effects-array.test.ts
  Tests  44 passed (44)

git check-ignore -v packages/layout/dist/index.umd.cjs answers .gitignore:6:dist, so the input this assertion turns on is not in the tree at all. One file, both directions, exit codes captured before any pipe.

Why it is filed rather than fixed in objectui#9122

That PR touches packages/i18n, packages/app-shell sources, apps/console, and four scripts/ files. It touches no package manifest that declares a sideEffects array, and it touches packages/layout not at all — so it cannot move alternateFormats. Lit control for that claim: the same command on the same tree passes with the one artifact absent, which it could not do if the diff were the cause.

Why it is worth a card

This is the third measured instance of the class objectui#6893 named (check-sdui-registration-pins.test.ts fails wherever packages/app-shell/dist EXISTS) and objectui#7460 named from the other side (check-readme-exports.test.ts reds on a HALF-built tree). objectui#7671 filed the conjunction of those two and is closed; this one is a different file and is not covered by any of the three.

The harm is the one objectui#7671 stated: a contributor who builds the workspace and then runs scripts/__tests__/ gets a red that their own diff cannot clear, the assertion message (expected 0 to be greater than 0) names nothing searchable, and a red that cannot be cleared is a red that gets ignored. CI does not see it, because the job that runs this gate installs without building the packages — which is also why the assertion was written this way and stayed true for as long as it has.

Not proposed here

Whether the fix is to make the case branch on build state the way check-readme-exports.test.ts tries to, to assert against a fixture rather than the live workspace, or to have classifyEntryForms read the manifest rather than the filesystem for this one question — that is a design call for whoever owns the gate, and each has a different failure mode. What this card carries is the measurement.

Refs: objectui#6893 · objectui#7460 · objectui#7671 · objectui#7479 / PR objectui#9122 (where it was hit).

[baozhoutao]

Claim: session_01FhBNJcLRZLe8M87VcUgpKr · branch claude/issue-9124-side-effects-build-state

Clause-②: no

domain:devx @ objectui PM seat, 2026-09-12T07:1xZ. ⭐ PM dispatch: this seat sets the assignee and posts this claim for its dev; the dev inherits both, ⛔ posts no second claim and ⛔ never writes the assignee. pm:queue → pm:dispatched.

Dispatched on triage's ruling of 2026-09-12T03:16Z (#issuecomment-5643099890), which is unusually complete: it picks the route, rejects one with evidence, names a falsifiable premise, and gives a hard fork instruction. All of it travels verbatim.

The direction — ⭐ ruled, ⛔ not the dev's to re-choose

Route 3: decide this one classification question from TRACKED INPUT — the manifest's own declaration — ⛔ not from fs.existsSync.

⭐ Triage's own measurement is what makes this rulable rather than a design debate: existsInPackage has exactly two call sites in all of scripts/, both inside classifyEntryForms:

scripts/check-side-effects-array.mjs:1028:  if (existsInPackage(form) && MODULE_FILE_RE.test(form) && !/\.d\.ts$/.test(form)) {
scripts/check-side-effects-array.mjs:1031:  if (existsInPackage(form)) return { form, kind: 'asset' };

⇒ the filesystem dependency is not scattered through the gate — it is shut inside one function's two branches. And MODULE_FILE_RE.test(form) already separates module from asset by extension; existsInPackage only decides whether to classify at all. ⇒ ⭐ the gate is asking the filesystem a question the manifest has already answered — exports declares the form and the sideEffects array lists it. The right input is present and simply unused.

⛔ Route 1 (branch on build state) is REJECTED, with evidence — it makes 「the verdict depends on the environment」 explicit rather than fixing it, and this repo already has the failure on record: objectui#7460 documents that check-readme-exports.test.ts tried exactly that and still reds on a half-built tree. ⛔ Do not copy a shape known to collapse.

⚠️ Route 2 (assert against a fixture) is not wrong — it is a DOWNGRADE here. The case is named 「the real workspace — the population this widening was measured against」; its entire value is asserting against the real workspace population. Swapping in a fixture replaces the thing it exists to prove.

⛔ The premise you must falsify FIRST — named and cheap

「existsInPackage 的存在性检查,对本门禁的其他断言不承重」

i.e. no other case relies on it to catch a DANGLING declaration — a form the manifest declares that will never exist on disk. The two call sites above narrow this to something falsifiable in minutes. ⇒ measure it before you change anything, and report it either way.

⛔⛔ HARD FORK — if the premise is FALSE

If existsInPackage is load-bearing elsewhere (some case depends on it to catch a dangling declaration):

• ⛔ Do NOT delete it globally.
• ⛔ Do NOT fall back to route 1 — see the rejection above.
• ⭐ STOP AND REPORT. Only then does 「fixture for this one case, live workspace for the rest」 (a localised route 2) become a data-backed option, and it is the PM's and triage's to take, ⛔ not yours.

Acceptance — triage's four, ⛔ none optional

1. Redo the two-way reproduction in the card's own shape: after pnpm turbo run build --filter='./packages/*' → red; then move only packages/layout/dist/index.umd.cjs aside, change nothing else → 44 passed (44). Both directions at delivery, exit codes captured before any pipe.
2. ⭐ After the fix, that same pair of operations must yield the SAME verdict. Built and unbuilt must agree. This is the card's only success criterion.
3. Report whether packages/app-shell — the other member of the population — also wavers across build states. ⛔ If the answer is zero, say what the probe looked for, so the zero is a reading rather than silence.
4. ⛔ Do NOT "fix" this by relaxing or deleting the assertion. What it asserts — that a second build format really exists in the real workspace — is true. What is broken is how it decides.

⚠️ Context worth having

This is the third measured instance of a named class and the three prior cards do not cover it: objectui#6893 (check-sdui-registration-pins.test.ts reds where packages/app-shell/dist exists), objectui#7460 (check-readme-exports.test.ts reds on a half-built tree), objectui#7671 (the conjunction of those two, closed).

⭐ The harm triage ranked p2 on is corrosion of the red itself: a contributor who builds the workspace and then runs scripts/__tests__/ gets a red their own diff can never clear, whose message (expected 0 to be greater than 0) contains nothing searchable — and a red that cannot be cleared is a red that gets ignored. ⇒ the cost is not this one case; it is that it trains everyone to ignore reds in that directory. ⛔ Not p1: CI cannot see it (the job that runs this gate installs without building), so nothing ships because of it.

⛔ Fences: no other gate touched · ⛔ no threshold lowered, ratchet raised, floor lowered or test skipped · ⛔ governed surface off limits (.claude/**, docs/adr/**, skills/**, AGENTS.md, CLAUDE.md) · ⛔ never edit content/docs/releases/ · ⛔ do not flip ready, enqueue or merge — I arm.

---

Generated by Claude Code

[claude]

os-dev-report

STOP AND REPORT — the triage premise is FALSE, so the hard fork of #issuecomment-5643099890 / #issuecomment-5644399211 fires. No code was changed.

Tip measured: 3bc1bb4903bc7d84d6095b3be000fa06eb4b97c1 (origin/main, fetched 2026-09-12), worktree claude/issue-9124-side-effects-build-state cut --no-track from it. git diff HEAD is empty — the branch carries the routing-probe push only.

---

1. Two-way reproduction REDONE, before any change

Both directions on one tree, exit code captured before any pipe (cmd > log 2>&1; EXIT=$?).

Direction A — after pnpm turbo run build --filter='./packages/*' (39/39 tasks successful):

VITEST_EXIT=1
 × finds a stylesheet subpath and a second build format, and no second entry POINT 795ms
AssertionError: expected 0 to be greater than 0
 Test Files  1 failed (1)
      Tests  1 failed | 43 passed (44)

Direction B — the SAME built tree, with only packages/layout/dist/index.umd.cjs moved aside:

target present, blob=782bc790a31b9c45098d5a36c7b713f619ac307f
moved aside; target absent confirmed
git check-ignore -v:
.gitignore:6:dist	packages/layout/dist/index.umd.cjs
VITEST_EXIT=0
 Test Files  1 passed (1)
      Tests  44 passed (44)
restore proven by STATE: blob=782bc790a31b9c45098d5a36c7b713f619ac307f equals pre-move 782bc790a31b9c45098d5a36c7b713f619ac307f; file exists: yes

⇒ card confirmed verbatim, on this tip.

---

2. ⛔ THE PREMISE IS FALSE — existsInPackage IS load-bearing elsewhere

Premise under test: "no other case relies on it to catch a DANGLING declaration — a form the manifest declares that will never exist on disk."

Measured by two-way ablation of the single line the two call sites share, re-located by content, not by line number:

scripts/check-side-effects-array.mjs:1013 (pre-ablation)
    return fs.existsSync(abs) && fs.statSync(abs).isFile();

Both legs: occurrence counts of the removed text and the injected text taken both directions before the run; restore proven by STATE (git hash-object equal to the HEAD blob, git diff HEAD naming nothing), never by an exit code; git checkout HEAD -- ABSPATH under trap ... EXIT INT TERM.

Ablation A — force return true (never detect an absent form)

occurrences of OLD after : 0
occurrences of NEW after : 1
matched line on disk now:
1013:    return true; /* ABLATION-MARKER */
VITEST_EXIT=1
      Tests  4 failed | 40 passed (44)
     × reads a second build FORMAT of one subpath as no new root
     × refuses a form it cannot classify rather than skipping it
     × refuses a subpath PATTERN, which names no single file
     × finds a stylesheet subpath and a second build format, and no second entry POINT
restore proven by STATE: blob=403ed6f5631604a67d04f7cf522c90da9597b9ad == HEAD blob; git diff HEAD names: []

Two of those four are exactly the dangling-declaration cases the premise says do not exist, and they do not merely go quiet — the gate CRASHES, because the dangling form is promoted to a graph root and then read:

 FAIL  ... > refuses a form it cannot classify rather than skipping it
Error: ENOENT: no such file or directory, open '/tmp/objectui-6683-P2HpGI/packages/pkg/dist/ghost.js'
 ❯ scanModule scripts/check-side-effects-array.mjs:687:8
 ❯ walkEntryGraph scripts/check-side-effects-array.mjs:771:18

 FAIL  ... > refuses a subpath PATTERN, which names no single file
Error: ENOENT: no such file or directory, open '/tmp/objectui-6683-Lp9Hk9/packages/pkg/dist/*.js'
 ❯ scanModule scripts/check-side-effects-array.mjs:687:8

The enforcing line, quoted inline — existsInPackage returning FALSE is the ONLY thing that keeps dist/ghost.js and dist/*.js out of the module branch, because MODULE_FILE_RE matches .js on both:

// scripts/check-side-effects-array.mjs, inside classifyEntryForms
if (existsInPackage(form) && MODULE_FILE_RE.test(form) && !/\.d\.ts$/.test(form)) {
  return { form, kind: 'module', sourceRel: form };
}
if (existsInPackage(form)) return { form, kind: 'asset' };
return { form, kind: 'unmapped' };

Ablation B — force return false (control: the probe can move the other way too)

matched line on disk now:
1013:    return false; /* ABLATION-MARKER */
VITEST_EXIT=1
      Tests  5 failed | 39 passed (44)
     × agrees with every array this repo actually declares
     × would go RED if one of those controls left the array
     × reads a published non-module ASSET as no new root
     × classifies every form every array-declaring package publishes
     × finds a stylesheet subpath and a second build format, and no second entry POINT

Leg B is the control that HITS in the same probe: the instrument moves in both directions, so leg A's four reds are a reading and not an artefact of a mutation that did nothing.

⇒ Premise FALSIFIED. Per the fork instruction — ⛔ not deleting it globally, ⛔ not falling back to route 1 — I stopped here and did not touch the gate.

---

3. ⭐ The PM steer's hypothesis — MEASURED, and it does NOT hold for this gate

The steer's concern: "in an unbuilt tree the roots point into dist/, nothing exists, every root drops, the graph is empty and the gate passes having measured NOTHING."

Measured false. Full probe of both array-declaring packages, run on the BUILT tree and again with all 39 packages/*/dist directories moved aside (control printed in-run: dist dirs still present under packages/: 0 (expect 0)). This is the ENTIRE difference between the two states:

4c6
<   subpath . · form dist/index.js · existsInPackage=true
---
>   subpath . · form dist/index.js · existsInPackage=false
11,13c13,15
<   subpath . · form dist/index.js · existsInPackage=true
<   subpath . · form dist/index.umd.cjs · existsInPackage=true
<   ENTRY subpath=. kind=entry-point sources=["src/index.ts"] forms=["dist/index.js","dist/index.umd.cjs"] alternateFormats=[]
---
>   subpath . · form dist/index.js · existsInPackage=false
>   subpath . · form dist/index.umd.cjs · existsInPackage=false
>   ENTRY subpath=. kind=entry-point sources=["src/index.ts"] forms=["dist/index.js","dist/index.umd.cjs"] alternateFormats=["dist/index.umd.cjs"]

Everything the gate actually MEASURES is byte-identical across the two states:

-- evaluate(): @object-ui/app-shell --   (BUILT and UNBUILT, identical)
   ok=true gauge=false modulesWalked=449 entryPoints=["src/index.ts"]
   registrars(14)=[... 14 source modules ...]
   missing=[] stale=[] problems=[]

-- evaluate(): @object-ui/layout --      (BUILT and UNBUILT, identical)
   ok=true gauge=false modulesWalked=8 entryPoints=["src/index.ts"]
   registrars(1)=["src/index.ts"]
   missing=[] stale=[] problems=[]

Why, with the enforcing lines quoted inline — the roots are already resolved to SOURCE, never to dist/:

// evaluatePackage
const entryPoints = [...new Set([map.sourceBarrel, ...classification.roots])].sort();

map.sourceBarrel is found by probing src/index.* on disk (tracked); classification.roots are the sourceRel values map.toSource(form) produces, and toSource returns a candidate only when src/STEM.EXT exists (tracked). dist/index.js never reaches existsInPackage at all — it short-circuits on the first branch, const inverted = map.toSource(form); if (inverted) return { form, kind: 'module', sourceRel: inverted };.

And an edge that fails to resolve is LOUD, not silently dropped:

for (const u of graph.unresolved) {
  problems.push(
    `${pkg.name}: unresolved relative specifier ${u} — an unwalked edge silently SHRINKS the enumeration, ` +
      `so it is reported rather than skipped`,
  );
}

pinned by the existing case refuses an unresolved relative specifier rather than shrinking the walk.

parseSource's if (!fs.existsSync(absFile) || !MODULE_FILE_RE.test(absFile)) return undefined; (the steer's :399) is reached only for files already pushed onto the walk stack by resolveRelative, which itself resolved them on disk — it is a cache-miss guard on the source tree, not a drop path for a declared root.

⇒ the steer's failure mode 2 ("make the built tree skip analysis as well") is not what this card is near. The gate measures 449 and 8 modules in BOTH states. The single wavering output in the whole gate is layout's alternateFormats.

---

4. Acceptance 3 — does packages/app-shell also waver? NO, and here is what the probe looked for

Probe, stated so the zero is a reading: for every form every array-declaring package publishes (the population is 4 forms across 2 packages — manifestEntrySubpaths output, printed above), compare across the BUILT and fully-UNBUILT tree: (a) the raw existsInPackage(form) reading, (b) the classifyEntryForms verdict line for the owning subpath, (c) the evaluate() line.

app-shell's reading:

• . → dist/index.js — input (a) DOES flip, true to false. Verdict (b) does not move: kind=entry-point sources=["src/index.ts"] alternateFormats=[] in both states, because the form inverts through the spelling map before existsInPackage is consulted.
• ./styles.css → src/styles.css — input (a) is true in both states: it is tracked source, not a build artefact. Verdict (b) kind=asset in both.
• (c) identical in both states.

⇒ app-shell is stable, and the zero is not silence: its dist/ input did move under the probe and the classification still did not. The control that HITS in the same run is layout's dist/index.umd.cjs — same probe, same population, positive detection. So the probe demonstrably can see a waver.

Root cause of the asymmetry, stated mechanically: .cjs is not in MODULE_FILE_RE (/\.(ts|tsx|mts|js|jsx|mjs)$/), so layout's require half can never take the inverting branch and falls through to the two existsInPackage branches — the only forms in this workspace that do.

---

5. What I refused, and what I need decided

⛔ Refused: implementing route 3 as specified (decide the classification from the manifest and drop the filesystem question), because the measurement above shows that shape deletes two live dangling-declaration detections and crashes the gate on both.
⛔ Refused: route 1 (rejected with evidence upstream).
⛔ Refused: relaxing, skipping or deleting the assertion — what it asserts is true.

⭐ The decision now on the PM's and triage's desk. The fork text offers "fixture for this one case, live workspace for the rest" as the data-backed option. I want to put a second, narrower option beside it before that is taken, because the measurement suggests the premise was very nearly right and failed only on a separable half:

• Option A — localised route 2 (the fork's own suggestion): fixture for finds a stylesheet subpath and a second build format..., live workspace everywhere else. Cost: the case's name and stated value are "the real workspace — the population this widening was measured against"; a fixture replaces the thing it exists to prove. Triage already called this a downgrade.

• Option B — structural alternate-format, existsInPackage untouched (recommended). Decide alternate-format from the manifest's own subpath STRUCTURE before asking the filesystem: a form that neither inverts nor is itself a source-tree module, sitting under a subpath where another form IS a module, is an alternate build format — no existence question, because the doc comment already defines it structurally ("the form did not invert, but a form under the SAME subpath did"). Every other path, including both existsInPackage call sites, stays exactly as it is. This is still route 3 — the decision moves to tracked input — and it deletes nothing.

  • ⚠️ UNMEASURED — I did not change code, per the fork. Predicted per case: refuses a form it cannot classify (./ghost, no module sibling) → unchanged, still loud; refuses a subpath PATTERN (./*, no module sibling) → unchanged, still loud; reads a published non-module ASSET (./styles.css, no module sibling) → unchanged, still asset; reads a second build FORMAT and the real-workspace case → build-state independent, fixed.
  • What it gives up, stated plainly: a dangling form under a subpath that already has a real module sibling stops being detected. That detection today fires only on UNBUILT trees — it is the very environment-dependence being removed — and such a form adds no root either way, since the sibling is the root.

• Option C — refuse rather than agree (the steer's own acceptable answer): make an unclassifiable form a non-zero refusal in both states. ⚠️ Measured obstacle: today's tree would then refuse on every UNBUILT checkout, because layout's dist/index.umd.cjs is legitimately absent there. That makes it a behaviour change to the gate's contract, not a repair.

⭐ If the answer is Option B, I can deliver it plus the build-state-invariance pin and its ablation in one round: the harnesses (two-way ablation with hash-proven restore, and the built/unbuilt probe) are written and exercised, and the worktree is built and warm.

Control that must survive whichever option is taken, as the steer requires: a package that genuinely violates the rule must still FAIL in BOTH tree states. The existing case would go RED if one of those controls left the array is that control against the real workspace; ablation B above shows it is live (it reds when the instrument is broken). I will run it in both tree states as a delivered measurement once the route is chosen.

MCP GitHub calls this run: 3.

---

Generated by Claude Code

[baozhoutao]

Round outcome: REFUSED, no edit, no PR — and the refusal was right. Route B approved; re-dispatched.

domain:devx @ objectui PM seat (session_01FhBNJcLRZLe8M87VcUgpKr), 2026-09-12T14:4xZ. Dev returned status: needs_decision, premise_still_valid: false, pr: null, git diff HEAD empty. ⭐ A refusal is the deliverable here, not a failed round — the stop-and-report fork fired exactly as dispatched and the round cost one measurement instead of one wrong design.

1. ⛔ CORRECTION — my own steer was wrong, and the dev falsified it

Before it wrote anything I steered the dev that this card's success criterion (「built and unbuilt trees yield the same verdict」) was satisfiable vacuously: that parseSource dropping a missing file silently —

// scripts/check-side-effects-array.mjs:399
if (!fs.existsSync(absFile) || !MODULE_FILE_RE.test(absFile)) return undefined;

— meant an unbuilt tree's dist/-rooted graph would be empty and the gate would pass having measured nothing. ⛔ That is false, and it is false about this gate specifically.

Measured, with all 39 packages/*/dist moved aside (in-run control printed dist dirs still present under packages/: 0 (expect 0)): evaluate() is byte-identical to the built tree — app-shell modulesWalked 449 with 14 registrars, layout 8 with 1, missing/stale/problems empty in both. Because roots are already resolved to SOURCE —

const entryPoints = [...new Set([map.sourceBarrel, ...classification.roots])].sort();

— dist/index.js short-circuits on map.toSource(form) before existsInPackage is consulted, and an unresolvable edge is loud, not dropped (「an unwalked edge silently SHRINKS the enumeration, so it is reported rather than skipped」).

⇒ I quoted a line that READS and never checked whether the path reaches it. ⭐ A quoted line proves the code CAN do a thing; it proves nothing about whether that branch is entered. The vacuity hazard I raised does not exist in this gate, and I have withdrawn it explicitly so it cannot bend the design.

⭐ The dev treated the steer as a hypothesis and measured it rather than designing around it. That is the correct response to a PM steer and it is what protected this round.

2. The premise in the dispatch is falsified — route 3 as specified is off the table

Route 3 as written (drop the filesystem question) would delete two live dangling-declaration detections. Two-way ablation of the single shared line return fs.existsSync(abs) && fs.statSync(abs).isFile();, with occurrence counts taken both directions and the injected line printed:

• Leg A (force true) — Tests 4 failed | 40 passed (44). Two do not merely go quiet, the gate crashes: Error: ENOENT: no such file or directory, open .../packages/pkg/dist/ghost.js at scanModule scripts/check-side-effects-array.mjs:687:8, on 「refuses a form it cannot classify rather than skipping it」 and on 「refuses a subpath PATTERN, which names no single file」. MODULE_FILE_RE matches .js on both, so the FALSE return is the only thing keeping them out of the module branch.
• Leg B (force false) — Tests 5 failed | 39 passed (44). ⇒ the control that HITS in the same probe: the instrument moves both ways, so leg A's reds are a reading and not a no-op mutation.

3. Ruling: route B, and ⛔ this is not a route change needing triage

The card's own 「Not proposed here」 section enumerates three designs, the third being 「have classifyEntryForms read the manifest rather than the filesystem for this one question」. B is that option, done narrowly: alternate-format is decided from the manifest's subpath STRUCTURE — a form that neither inverts nor is itself a source-tree module, under a subpath where ANOTHER form IS a module — which is how the gate's own doc comment already defines it (「the form did not invert, but a form under the SAME subpath did」). ⭐ Both existsInPackage call sites stay exactly as they are, so both dangling-declaration detections and the ENOENT path are untouched. ⇒ the decision moves to tracked input and nothing is deleted. The card left this design call to 「whoever owns the gate」; this seat is taking it.

⛔ A refused — asserting against a fixture replaces 「the real workspace — the population this widening was measured against」, which is the case's entire value. ⛔ C refused — refusing on every unbuilt checkout is a contract change to the gate, not a repair.

4. ⛔ Conditions on the re-dispatch

1. ⭐ The three 「predicted unchanged」 cases must be MEASURED, not predicted — the dev flagged them UNMEASURED itself: ./ghost still loud, ./* still loud, ./styles.css still asset. A prediction in a report is prose, and prose is not evidence of behaviour.
2. ⭐ A build-state invariance pin plus its ablation — the pin must FAIL when the invariance is removed, shown failing.
3. ⭐ A control with a known direction, run in BOTH tree states in the same round — 「would go RED if one of those controls left the array」, which leg B proved live. ⛔ Agreement between the two states is not by itself evidence of a working gate.
4. ⭐ What B gives up must be DECLARED in the instrument's own header, not only in the report. Named honestly by the dev: a dangling form under a subpath that already has a real module sibling stops being detected. ⇒ it must not become a silent gap — a declared gap is this repo's accepted state; a SILENT one is the defect. With the reason: that detection fires today only on unbuilt trees, i.e. precisely the environment-dependence being removed, and such a form adds no root either way.

Changeset required; draft PR on claude/issue-9124-side-effects-build-state. The worktree is kept warm (installed, 39/39 turbo tasks built) for the follow-up round — approved, and worth the ~5 minutes it saves.

⚠️ Not re-verified by this seat: the build/unbuilt reproduction and the ablation legs above are the dev's runs. The restores are proven by STATE rather than by exit code (blob=782bc790a31b9c45098d5a36c7b713f619ac307f for the moved artifact; blob=403ed6f5631604a67d04f7cf522c90da9597b9ad == HEAD blob, git diff HEAD names: [] for the ablation), which is the right proof shape. ⭐ I will review the round against the diff, including specifically whether condition 4 landed in the file.

---

Generated by Claude Code

[claude]

os-dev-report

Route B implemented. Draft PR objectui#9292. Base measured 3bc1bb4903; all figures below from head 5b95531028 unless stated. This supersedes the needs_decision report above, which stands as the record of the premise falsification.

Route B — what changed, and what deliberately did not

classifyEntryForms now runs two passes. The first asks one question of each form — is it a module this gate can walk? — exactly as before, existsInPackage included. The second decides what the NON-module forms are, and does it per subpath:

• a non-module form under a subpath that already resolves to a module is an alternate-format, decided from the manifest's structure, with no filesystem call;
• a non-module form under a subpath with no module form must still earn asset from existsInPackage, unchanged, and is still refused loudly otherwise.

⛔ existsInPackage is untouched and keeps both call sites. Nothing was deleted, no assertion relaxed, no test skipped.

Acceptance 1 + 2 — the two-way reproduction, redone before AND after

Exit codes captured before any pipe (cmd > log 2>&1; EXIT=$?).

tree state	BEFORE 3bc1bb4903	AFTER 5b95531028
built (39/39 turbo tasks)	VITEST_EXIT=1 · Tests 1 failed | 43 passed (44) · AssertionError: expected 0 to be greater than 0	VITEST_EXIT=0 · Tests 46 passed (46)
built, only packages/layout/dist/index.umd.cjs aside	VITEST_EXIT=0 · Tests 44 passed (44)	VITEST_EXIT=0 · Tests 46 passed (46)
fully unbuilt (all 39 packages/*/dist aside)	VITEST_EXIT=0 · Tests 44 passed (44)	VITEST_EXIT=0 · Tests 46 passed (46)

⇒ the card's only success criterion is met: built and unbuilt now agree. Every move-aside restored and proven by STATE — blob=782bc790a31b9c45098d5a36c7b713f619ac307f equals pre-move ...; file exists: yes, git diff HEAD empty — never by an exit code.

⛔ The agreement is not a dead gate — and the input still moves

Real-workspace probe over every published form, run in both states. After the fix, the ONLY remaining difference is the raw existsInPackage reading; every classification line and every evaluate() line is identical:

=== AFTER FIX: diff BUILT vs UNBUILT ===
3c3
<   subpath . · form dist/index.js · existsInPackage=true
---
>   subpath . · form dist/index.js · existsInPackage=false
10,11c10,11
<   subpath . · form dist/index.umd.cjs · existsInPackage=true
---
>   subpath . · form dist/index.umd.cjs · existsInPackage=false
INPUT_DIFF_EXIT=1 (1 = the input did move)

Before the fix that same diff also carried the verdict, which is now gone:

<   ENTRY subpath=. kind=entry-point ... alternateFormats=[]
---
>   ENTRY subpath=. kind=entry-point ... alternateFormats=["dist/index.umd.cjs"]

Requirement 3 — control with a known direction, BOTH tree states, same round

A genuinely violating package must still FAIL. @object-ui/app-shell with one entry removed from its real array:

######## CONTROL WITH A KNOWN DIRECTION [BUILT] ########
VIOLATING @object-ui/app-shell (removed src/console/connect/ConnectAgentWidget.tsx from the array):
   ok=false            <- MUST be false
   missing=["src/console/connect/ConnectAgentWidget.tsx"]   <- MUST name the removed module
   modulesWalked=449 registrars=14
   VERDICT: HIT (gate detects the violation)
CLEAN @object-ui/app-shell: ok=true missing=[] stale=[] problems=[] modulesWalked=449 registrars=14
CLEAN @object-ui/layout: ok=true missing=[] stale=[] problems=[] modulesWalked=8 registrars=1
main([], root) = 0   <- MUST be EXIT_OK (0)

######## CONTROL WITH A KNOWN DIRECTION [UNBUILT] ########
   ok=false
   missing=["src/console/connect/ConnectAgentWidget.tsx"]
   modulesWalked=449 registrars=14
   VERDICT: HIT (gate detects the violation)
CLEAN @object-ui/app-shell: ok=true missing=[] stale=[] problems=[] modulesWalked=449 registrars=14
CLEAN @object-ui/layout: ok=true missing=[] stale=[] problems=[] modulesWalked=8 registrars=1
main([], root) = 0

Violation HIT in both; clean workspace passes in both; modulesWalked 449 / 8 and 14 / 1 registrars in both.

Requirement 1 — the three cases I had only PREDICTED, now MEASURED

Gate's own output, each fixture run in both states (I ran both rather than the one asked for, because the point is invariance):

======== CASE 1 — ./ghost (dangling .js, NO module sibling) must stay LOUD ========
 -- UNBUILT --  gauge=true ok=false
    problems=["... cannot CLASSIFY \"./dist/ghost.js\". It is not a form the published/source
               spelling map inverts to a module that exists, it is not a file present in the
               package exactly as published, and no other form under the same subpath is an
               entry point it could be a second build format of. ..."]
 -- BUILT --    gauge=true ok=false   (same problem text)

======== CASE 2 — ./* subpath PATTERN (names no single file) must stay LOUD ========
 -- UNBUILT --  gauge=true ok=false  problems=["... cannot CLASSIFY \"./dist/*.js\". ..."]
 -- BUILT --    gauge=true ok=false  (same problem text)

======== CASE 3 — ./styles.css (real file, NO module sibling) must stay `asset` ========
 -- UNBUILT --  gauge=false ok=true  entryForms=[[".","entry-point",[]],["./styles.css","asset",[]]]
 -- BUILT --    gauge=false ok=true  entryForms=[[".","entry-point",[]],["./styles.css","asset",[]]]

All three unchanged, in both states. Also confirmed as green ticks in the unbuilt suite run, alongside reads a second build FORMAT of one subpath as no new root.

Requirement 2 — the pin, and its ablation

Two new cases (44 to 46), both against one manifest run twice, with and without build output on disk. The pin asserts the alternate format is actually found in both states before asserting the two agree — two empty sets agree with each other, so without that it would survive a gate that stopped classifying.

Ablation: revert ONLY the structural decision (restore the fs.existsSync-decided single pass), keep the tests.

pre-mutation blob=71166ee2333697f9d4e4fba76226f4dca78a2ae1  HEAD blob=71166ee2333697f9d4e4fba76226f4dca78a2ae1
occurrences of FIXED text before: 1        occurrences of ABLATED text before: 0
occurrences of FIXED text after : 0        occurrences of ABLATED text after: 1
matched lines on disk now:
1066:      return { form, kind: 'unmapped' };
post-mutation blob=a5d437af724ce593b47b6250778a67bd352e213d (differs from 71166ee2333697f9d4e4fba76226f4dca78a2ae1)
VITEST_EXIT=1
      Tests  2 failed | 44 passed (46)
     × classifies a second build FORMAT the same way built and unbuilt
     × finds a stylesheet subpath and a second build format, and no second entry POINT

AssertionError: expected [] to deeply equal [ 'dist/index.umd.cjs' ]
 ❯ scripts/__tests__/check-side-effects-array.test.ts:740:65

restore proven by STATE: blob=71166ee2333697f9d4e4fba76226f4dca78a2ae1 == HEAD blob; git diff HEAD names: []

Both legs: occurrence counts of removed and injected text taken both directions before the run, post-mutation blob proven different from pre-mutation, restore by STATE under trap on EXIT/INT/TERM with git checkout HEAD -- ABSPATH and an absolute path from git rev-parse --show-toplevel.

Requirement 4 — the declared gap, IN THE INSTRUMENT

New section in the gate's own header, ### ⛔ What this classification DECLINES to detect, and why (objectui#9124), in the file's existing voice, stating: a dangling form under a subpath that already has a real module form is no longer detected; the detection it replaces fired only on an unbuilt checkout (on a built tree the same form existed as a build artefact and passed as an asset, silently), so the choice was never "detect it or not" but "let the verdict depend on whether dist/ happens to be present, or not"; the cost is bounded because such a form adds no graph root either way; and ⛔ the gap is not widened to subpaths with no module form, where removing the check was measured to promote a dangling form to a root and crash the walk on ENOENT. The classifyEntryForms doc comment and the header's one-line summary were updated to match what the code now decides.

Gates run locally

gate	result
vitest run scripts/__tests__/check-side-effects-array.test.ts	Tests 46 passed (46) — built, half-built, fully unbuilt
node scripts/check-side-effects-array.mjs	EXIT=0, both packages ✅
side-effects-declaration-consistency.test.ts (sibling gate)	Tests 32 passed (32)
check-sdui-registration-pins.test.ts	Tests 15 passed (15)
pnpm run type-check:scripts	EXIT=0
eslint on both changed files	EXIT=0, 0 errors 0 warnings
check-changeset-presence	EXIT=0 — 1 changeset(s) added
check-changeset-no-major · check-control-bytes · check-new-cross-file-line-citations	all EXIT=0

Consumer scan: classifyEntryForms has no importer outside this gate and its own test (check-sdui-registration-pins.mjs imports only deriveSpellingMap and readArrayPackages, both untouched). Repo-wide pnpm lint and the rest of the farm are declared to CI.

⛔ No skip-changeset label applied — this repo declares with an empty-frontmatter changeset, and the gate's own verdict line above is the authority.

⚠️ Two things to flag, neither hidden

1. I clobbered an existing changeset and fixed it forward. The first commit wrote this card's changeset to .changeset/olive-donkeys-smile.md, which already existed on main carrying a live @object-ui/plugin-charts: minor note — that bump and its CHANGELOG entry would have been dropped silently. Caught on the M (not A) in git status. Second commit restores it byte-identical to the base and moves mine to an issue-derived filename. Net effect on .changeset/ is one file added, none modified. ⛔ Not amended away, per the no-amend rule and because the accident should stay auditable.
2. My earlier report said 3 MCP GitHub calls; the true figure is 2. I counted a ToolSearch schema fetch as one. Corrected below.

On the steer

Recorded as the PM asked: the vacuity trap does not exist in this gate, and it did not constrain the design. Dropped.

MCP GitHub calls this run: 2 (both issue_read). Everything else went over git, the local tree, and REST.

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Generated by Claude Code

[claude]

os-dev-report

Send-back addressed. Prose only, new commit 9fcd786c77, no amend. Draft PR objectui#9292 still draft, head 9fcd786c77.

⭐ I ran your measurement before acting on it. It reproduces exactly.

You asked me not to correct the header to match your numbers if my own run disagreed. It does not disagree. Independent run — base copy extracted from 3bc1bb4903 (blob verified equal to 403ed6f563...), both versions imported side by side, classifyEntryForms with an injected root, one manifest whose . publishes an import half and a require half, dist/index.js present in every built leg:

REAL alternate format (umd IS produced)   [BUILT tree]
   base: alternateFormats=[]                        kind=entry-point  problems=0
   head: alternateFormats=["dist/index.umd.cjs"]    kind=entry-point  problems=0
DANGLING (declared, never produced)       [BUILT tree]
   base: alternateFormats=["dist/index.umd.cjs"]    kind=entry-point  problems=0
   head: alternateFormats=["dist/index.umd.cjs"]    kind=entry-point  problems=0

⭐ I added the leg your table did not carry, because it is the half that makes the inversion unmistakable — the same pair on an UNBUILT tree:

   base: alternateFormats=["dist/index.umd.cjs"]    problems=0   (BOTH legs — identical)
   head: alternateFormats=["dist/index.umd.cjs"]    problems=0   (BOTH legs — identical)

⇒ confirmed on all three points. The discrimination existed only on a BUILT tree, where alternateFormats was exactly the dangling set. On an unbuilt tree base gives the identical answer for a real format and a dangling one, so the field separated nothing — my header named that state and called it the only state where the behaviour fired. It was backwards, and the second sentence contradicted my own definition two lines above. problems is 0 in all eight readings: never a refusal.

The temp base copy was written to a dot-prefixed path inside scripts/ and removed under a trap, with git status printed empty afterwards.

What changed in 9fcd786c77

Header block retitled ### ⛔ What this classification GIVES UP, and why (objectui#9124) and rewritten to state:

• what is given up is DISCRIMINATING POWER, not visibility — a dangling form is still LISTED in alternateFormats, it just no longer stands ALONE there;
• it was a REPORTED FIELD, never a refusal — problems empty either way, so nothing that used to fail now passes;
• the discrimination existed only on a BUILT tree (with the two behaviours spelled out), and on an unbuilt tree the field separated nothing — which is the defect this branch fixes;
• the trade, plainly: a build-state-dependent verdict exchanged for the ability to spot a dangling form beside a real one; worth it because the first is a red a contributor cannot clear and the second was never enforced.

⛔ Kept verbatim, as you asked — the bound (not widened to subpaths with no module form, where existsInPackage still decides and ENOENT-promotion was measured) and the no-graph-root argument. Only the lead-in words What the gap costs became What the trade costs, for consistency with the retitled block; the argument is byte-identical otherwise.

⭐ One addition on my own initiative, because it is this lane's own rule applied to the thing that just failed: the block now ends by pointing at the pair of test cases that re-derive it — ⛔ do not trust this paragraph over them. A header that had pointed at its instrument instead of asserting a remembered intuition would not have been able to go wrong this way.

Prose-only, proven mechanically

=== changed files ===         M scripts/check-side-effects-array.mjs
=== every changed line must be inside a comment ===
NON-COMMENT LINES ABOVE: none means prose-only (grep exit=1)
=== test file untouched? ===  (empty = untouched)

Re-run to confirm nothing moved

check	result on 9fcd786c77
gate tests, built tree	VITEST_EXIT=0 · Tests 46 passed (46)
gate tests, only packages/layout/dist/index.umd.cjs aside	VITEST_EXIT=0 · Tests 46 passed (46)
gate tests, fully unbuilt (39 dist dirs aside)	VITEST_EXIT=0 · Tests 46 passed (46)
node scripts/check-side-effects-array.mjs	EXIT=0, both packages ✅
pnpm run type-check:scripts	EXIT=0
eslint scripts/check-side-effects-array.mjs	EXIT=0
node scripts/check-control-bytes.mjs	EXIT=0

Every move-aside restored and proven by STATE (blob=782bc790a3... equals pre-move; all 39 dist dirs present again), never by an exit code.

PR body

The corresponding section rewritten with the measurement table above, plus the plain trade sentence you asked for, in both the English body and the 维护者速读 section.

⚠️ Byte-level note, since the first edit produced a visible artefact: the PR body now carries exactly one attribution footer. PATCH appended a second one — +58 bytes, matching AGENTS.md's documented reading of that behaviour to the byte. Remedied the way that same entry prescribes: both footer blocks stripped from the submitted body (the platform re-appends exactly one), and the session reference moved into prose as a backtick code span, which is the form AGENTS.md records as surviving PATCH. Re-read confirms one footer, session URL present, all 14 code fences intact.

Worktree

Torn down, as agreed once this landed. Clean state verified first — no uncommitted changes, 0 unpushed commits — then node_modules removed and git worktree remove without --force, exit 0; path gone; the other agents' worktrees untouched.

On the pattern you named

Third prose-vs-code inversion today, and mine was written exactly the way you describe: from an intuition I never ran, in a paragraph asserting a fact rather than pointing at an instrument. I had the harness that would have caught it — I used base-vs-head ablation for the code and then wrote the rationale from memory. The pointer-to-the-tests line above is the part of this I would carry forward.

MCP GitHub calls this round: 0 — cumulative 2 for the whole card.

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Generated by Claude Code

[claude]

LANDED — e63ebfad84efe28837116461b48a3ebf1f3922d6. Probe run on <merge>^ <merge>: 4 of 4 legs pass.

domain:devx @ objectui PM seat (session_01FhBNJcLRZLe8M87VcUgpKr), R55. PR objectui#9292 merged 2026-09-12T15:48Z; main is now that commit and the queue is empty.

⚠️ errata 62b — closed, not assumed

The legs were counted on 3bc1bb4903, re-confirmed on the queue base 345e24a0, and the actual merge parent is:

merge  = e63ebfad84efe28837116461b48a3ebf1f3922d6
parent = 345e24a0c81b651aeef058dbad8476eee2f06ca8   ← identical to the base the legs were counted on

⇒ the readings transfer exactly. ⛔ No leg was rewritten after landing; these are the ones posted at #issuecomment-5646721428 before arming, run verbatim.

The probe

Reader: git show <ref>:scripts/check-side-effects-array.mjs | grep -vE '^\s*(\*|//|/\*)' — code only, so a docblock quoting a removed spelling cannot be miscounted as the spelling surviving.

leg	expected	parent	merge
existsInPackage(	2 → 2	2	2	✅
kind: 'non-module'	0 → 1	0	1	✅
kind: 'unmapped'	1 → 0	1	0	✅
MODULE_FILE_RE	4 → 4	4	4	✅

⭐ The load-bearing leg is existsInPackage( staying at 2 — route B's entire promise was that the filesystem check keeps both call sites, so neither the dangling-declaration detection nor the loud ENOENT refusal is deleted. Matched lines on the merge, printed rather than counted:

583:      if (existsInPackage(form) && MODULE_FILE_RE.test(form) && !/\.d\.ts$/.test(form)) {
606:    const dangling = nonModuleForms.filter((c) => !existsInPackage(c.form));

⭐ kind: 'non-module' arriving and kind: 'unmapped' leaving is the firing pair: either alone would be satisfied by leaving the stale spelling in place; together they prove a replacement rather than an addition.

What shipped

classifyEntryForms now runs two passes. The first asks only 「is this form a module this gate can walk?」 — existsInPackage included, unchanged. The second decides what the non-module forms are, per subpath: a non-module form under a subpath that already resolves to a module is an alternate-format, decided from the manifest's structure with no filesystem call, because that is a fact about the declaration and reads the same on a built and an unbuilt checkout. A non-module form under a subpath with no module form must still earn asset from existsInPackage, and is still refused loudly otherwise.

⇒ the card's criterion is met: built and unbuilt trees now yield the same verdict, and the input still moves (the raw existsInPackage readings still differ between the two states), so the agreement is ⛔ not 「nothing was looked at」.

Recorded, because the round's value was in what it refused

• ⭐ Round 1 was a REFUSAL and the right one. Route 3 as dispatched would have deleted two live dangling-declaration detections and turned them into an ENOENT crash at scanModule. Two-way ablation proved it, with the opposite leg firing in the same run so the reds were a reading and not a dead mutation.
• ⛔ A PM steer of mine was measured FALSE and withdrawn. I claimed the criterion was vacuously satisfiable because parseSource drops a missing file silently. The dev measured it: with all 39 packages/*/dist moved aside, evaluate() is byte-identical — roots already resolve to source and dist/index.js short-circuits before existsInPackage is reached. ⭐ It treated the steer as a hypothesis and tested it instead of designing around it.
• ⛔ A header paragraph shipped backwards and was sent back. Measured base-vs-head, the discrimination being given up existed only on a BUILT tree and was a reported field, never a refusal (problems 0 in all eight readings). The corrected header now ends by pointing at the test cases that re-derive it — 「⛔ do not trust this paragraph over them」.
• ⚠️ A near-miss worth keeping: the first commit clobbered .changeset/olive-donkeys-smile.md, a live @object-ui/plugin-charts: minor note already on main. Caught on the M-vs-A, repaired forward rather than amended, so it stays auditable. Verified at landing: the branch's net effect on .changeset/ is one file added, none modified.

Closing objectui#9124, stripping pm:* and the assignee.

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Generated by Claude Code