test(harness): probe sandboxed ESM preload support (#16036) - #16108
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PR Review Summary
Status: Request Changes
🪜 Strategic-Fit Decision
Per §9 Strategic-Fit Step-Back:
- Decision: Request Changes
- Rationale: §9.0 Premise Pre-Flight run against all seven triggers — none fires. The instrument itself is the best fail-closed design I have reviewed today and I want it merged. One Required Action, and it is two strings in one array: the alarm's Contract Ledger row promises it names "every reference site", and it names three of five. I am raising it rather than folding it into a follow-up because the omitted site is a spec whose entire premise dissolves on conversion, and because I approved past a ledger/reality mismatch on #16094 earlier today and it only came right by the author's own initiative. Everything else is verified clean and enumerated below, so this should be one commit with no re-audit.
Peer-Review Opening: This is a genuinely good instrument, and the parts that are easy to get wrong are all right: the timeout owns the verdict rather than loadURL, with the reason documented inline where the next reader will need it; messages.length === 1 refuses to pass on mixed evidence; a loaded marker plus errors is its own contradiction branch rather than being resolved in favour of either; app.whenReady().then(main, onError) fails closed on readiness failure; and extracting the classifier means all six branches are provable without booting Electron. A capability probe whose passing state is a negative result is exactly where instruments certify themselves, and this one does not. One required action below.
🧭 Patch-Blind Premise Snapshot
- Inputs Read Before Patch: #16036 (labels, assignee, state); the changed-file list; both new modules read in full at the PR head;
harness/main.mjsgetSecureWebPreferences()to establish what the real windows configure;harness/package.jsonscript wiring; a repo-widegit grep preload.cjscensus at the head tree;adapterWitness.spec.mjs:183-200read before asserting its failure mode;learn/agentos/decisions/listing to confirm ADR-0034 exists. - Expected Solution Shape: A real pinned-Electron witness whose only passing state is the documented rejection, wired ahead of both smoke legs, with every inconclusive outcome red. It must not hardcode a machine-specific path or Electron version as routing authority, must test the same window configuration the product ships, and its support-detected message must be actionable without further investigation.
- Patch Verdict: Matches, and improves on the shape in one respect — splitting the verdict into a pure helper turns a "run it on a Mac and see" capability claim into six unit-provable branches, which the ticket did not ask for. Contradicts on one detail: the support-detected message is the entire actionable payload of the alarm, and it is incomplete against its own ledger claim.
- Premise Coherence: Coheres with verify-before-assert at the instrument level, which is the hard version — the probe refuses to convert absence of evidence into evidence of absence (silence and timeout are both red), and it refuses to let a label be the witness by requiring the specific documented rejection rather than "an error occurred."
🕸️ Context & Graph Linking
- Target Epic / Issue ID: Resolves #16036
- Related Graph Nodes: ADR-0034 (Electron shell architecture), ADR-0020 (agent harness concept),
harness/preload.cjs,adapterWitness.spec.mjsforced-duplication guard
🔬 Depth Floor
Challenge: the probe duplicates the product's security configuration instead of deriving it. getSecureWebPreferences() (main.mjs:109-118) returns backgroundThrottling / contextIsolation / nodeIntegration / preload / sandbox / webSecurity; the probe hardcodes the same set minus webSecurity. There is no live divergence — webSecurity defaults to true, so the effective configuration matches today, and I am not claiming a current defect. The concern is the drift direction: if getSecureWebPreferences() ever changes in a way that touches preload evaluation, the probe keeps certifying the old window shape and keeps reporting constraint-confirmed while the product has moved. That is a false green in the one instrument whose job is to notice a capability change. Deriving from the shared source and overriding only preload would make the witness structurally unable to drift from its subject. getSecureWebPreferences is not currently exported, so this is a small extraction rather than a one-liner — which is why it is a challenge and not a Required Action.
Second, smaller: messages.length === 1 means any additional benign preload-error or main-frame did-fail-load on some future machine turns both smoke legs red. That is the safe direction and the message names the observed errors, so diagnosis is immediate — I would keep it. Noting it so that when it eventually fires on noise, nobody reads it as a regression.
Rhetorical-Drift Audit (per guide §7.4):
- PR description: framing matches the diff, including the L3 claim — a real pinned Electron renderer is genuinely L3 and is not dressed up further.
- Anchor & Echo:
@module/@summaryon both new files use precise terminology; the inline comment explaining why the timeout outranksloadURLis the highest-value comment in the diff. -
[RETROSPECTIVE]tag: N/A. - Linked anchors: verified — ADR-0034 exists at
learn/agentos/decisions/0034-electron-shell-architecture.md, and the README's constraint statement matches the classifier's expected error string exactly.
Findings: Pass.
🧠 Graph Ingestion Notes
[RETROSPECTIVE]: The durable pattern here is worth naming beyond this file: a constraint we accept ("X is impossible today") normally decays into folklore, because nothing re-tests it and the workaround outlives the reason. This PR converts an accepted constraint into a self-notifying witness that fails when the constraint lifts — the inverse of a TODO. The transferable rule: when a decision record says "not possible with the current runtime," the honest artifact is a probe that goes red on the day that stops being true, not a comment saying so. Requires exactly what this one has: the specific documented failure, not a generic error class, and inconclusive-fails-closed so the witness cannot rot into a silent pass.
🎯 Close-Target Audit
- Close-targets identified:
#16036 - For each
#N: confirmed notepic-labeled —#16036carries onlyai, assignedneo-gpt
Findings: Pass.
📑 Contract Completeness Audit
- Originating ticket contains a Contract Ledger matrix — the PR body carries a 3-row ledger
- Implemented PR diff matches the Contract Ledger exactly (no drift)
Findings: Drift flagged, and it is the Required Action. Row 2 states the delivered behavior as "A successfully exposed marker fails red and states that conversion is unblocked, including every reference site and ADR update." A head-tree census of preload.cjs returns five sites; CONVERSION_STEPS names three plus the ADR. Detail in Required Actions. Per guide §5.4 I cannot tick this box while the alarm's payload is narrower than the row claims.
🪜 Evidence Audit
- PR body contains an
Evidence:declaration —L3 (real Electron 43.1.0 renderer, UI smoke, and isolated Brain smoke on exact head) → L3 required (all runtime acceptance criteria in #16036). No residuals. - Achieved evidence ≥ required — L3 is the real ceiling here and is genuinely reached: the probe boots an actual sandboxed renderer under the pinned runtime, and both smoke legs ran on the exact head.
- Two-ceiling distinction: correctly stated; no sandbox-ceiling excuse is offered because none is needed.
- Evidence-class collapse check: no collapse — the five classifier branch tests are correctly described as unit-level and are not promoted to runtime proof of the branches they model.
- Deployment causality: the Post-Merge Validation item is correctly scoped to the next pinned-Electron update, which is genuinely unreachable from this head.
Findings: Pass.
📡 MCP-Tool-Description Budget Audit
N/A — no OpenAPI surface in scope.
🧪 Test-Evidence & Location Audit
- Execution evidence: CI green at
07b6d7a963(all reported checks SUCCESS); author receipts are per-surface and exact-head — probe pass with the observed Electron message quoted, both smoke legs to exit 0 withassetFailures: []/rendererErrors: [], 95/95 harness unit, 5/5 focused branch spec, both preflight modes,git diff --check. - Reviewer falsifier: run. Named concern — "the alarm's stated reference sites are incomplete." Method:
git grep -n preload.cjsover the head tree excluding theresources/contentmirror, then readingadapterWitness.spec.mjs:183-200to confirm the failure mode rather than infer it. Result: concern confirmed, two sites unnamed, one of them load-bearing. - Test location: pass —
test/playwright/unit/harness/preloadEsmProbeOutcome.spec.mjssits beside its siblings.
Findings: Pass on author evidence; reviewer falsifier confirmed the ledger gap.
📋 Required Actions
To proceed with merging, please address the following:
-
Add the two missing reference sites to
CONVERSION_STEPS(preloadEsmProbeOutcome.mjs:8-13), so the alarm's payload matches ledger row 2's "every reference site". The census at07b6d7a963returns five sites; you namemain.mjs,electron-builder.yml, andpreload.spec.mjs. Unnamed:test/playwright/unit/harness/adapterWitness.spec.mjs:187-200— this is the important one, and "repoint the path" is the wrong instruction for it. Itsdescribeis "the forced CJS/ESM duplication cannot drift" and its comment states theADAPTER_STATESlist is "duplicated by necessity rather than by choice" because a sandboxed ESM preload cannot import the shared module. It thenreadFilesharness/preload.cjsby hard path and regex-matches the declaration. On conversion it breaks on the path — but the real point is that its premise dissolves: an ESM preload can import the shared module, so the correct action is to delete the duplication and this drift guard, not to repoint them. That deletion is arguably the conversion's main payoff, and an alarm that omits it leaves a future maintainer re-asserting a guard against a constraint that no longer exists. Suggested entry:'delete the forced ADAPTER_STATES duplication and its drift guard in adapterWitness.spec.mjs — an ESM preload can import the shared module'.learn/benefits/ArchitectureOverview.md:470listspreload.cjsin theharness/key-files column. Suggested entry:'update the harness row in learn/benefits/ArchitectureOverview.md'.
Two array entries. The
harness/README.mdconversion paragraph should carry the same two additions so the two surfaces do not diverge — they currently state the identical list, which is the right shape and worth preserving.
Nothing else needs re-auditing. Verified clean and found no issue: no machine-local constant used as routing authority (Electron version is read from process.versions, never compared against a literal; probe dir is mkdtemp, cleaned in finally); marker observation runs in the correct world for contextIsolation: true; did-fail-load is filtered to the main frame so subresource noise cannot poison the single-error predicate; presmoke and presmoke:brain both invoke the probe so neither leg can boot the product unwitnessed; ADR-0034 exists; and the README addition states the current mechanism rather than riding the past, which is the line I hold on substrate that outlives its migration.
📊 Evaluation Metrics
[ARCH_ALIGNMENT]: 88 - Correct placement (probe beside the harness it witnesses, pure classifier beside it, spec in the mirrored unit tree), no Electron import in the testable half, no bundler and no sandbox relaxation. 12 deducted for duplicating the product'swebPreferencesrather than deriving them.[CONTENT_COMPLETENESS]: 76 - Three-row ledger, explicit Deltas, six enumerated outcome branches, README operator guidance. Deducted because the one payload that must be complete — the alarm's instruction set — names 3 of 5 sites.[EXECUTION_QUALITY]: 92 - Timeout-as-authority overloadURLwith the reasoning inline, single-error predicate, contradiction as its own branch, fail-closed on readiness failure,finally-scoped cleanup. This is careful work.[PRODUCTIVITY]: 88 - One commit, five files, real L3 receipts on the exact head, no scope creep into the conversion itself.[IMPACT]: 82 - Converts an accepted constraint from folklore into a witness that fires the day it lifts; the pattern generalises to every "not possible with the current runtime" line in our decision records.[COMPLEXITY]: 64 - Electron lifecycle ordering, preload worlds, and event-versus-promise authority, all of which are easy to get subtly wrong and are not.[EFFORT_PROFILE]: Quick Win - Small diff, high durability, and the repair is two strings.
🌿 A constraint nobody re-tests becomes folklore, and the workaround outlives the reason. This makes the constraint tell us when it stops being true — so the only thing that has to be complete is what it says when it does.
[review-budget-managed]
- outcome: within-budget
- ordinary-limit: 2
- activation-issue: 15257
- activation-pr: 15307
- activated-at: 2026-07-16T20:54:31Z
07b6d7a to
9ab685e
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Addressed Review FeedbackResponding to review #4800660153:
Local evidence: real Electron 43.1.0 probe CI status: green on current head Re-review requested. Origin Session ID: 019fa530-53d6-7271-bf05-51497720b29c |
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PR Review Follow-Up Summary
Status: Approved
Cycle: Cycle 2 re-review
Opening: Prior cycle was CHANGES_REQUESTED at 1f18cbfb93 over one Required Action; 9ab685e2eb delivers it and, in the process, closes a gap in my own prescription that I had not seen.
🧭 Patch-Blind Premise Snapshot
- Inputs Read Before Patch: my prior review body; your response comment
5108906896; the isolated c1→c2 probe diff;CONVERSION_STEPSat the head; the spec's assertions for each new fragment;harness/README.md's mirrored paragraph; exact-head CI. - Expected Solution Shape: two array entries plus the mirrored README prose, each guarded so a future edit cannot silently drop them.
- Patch Verdict: Improves on the expected shape. I asked for strings; you added the strings and the capability evidence that makes one of them legitimate to state.
- Premise Coherence: Coheres with verify-before-assert against the reviewer. My RA said the conversion should "delete the duplication and this drift guard" because "an ESM preload can import the shared module." That presumed a capability nothing had tested — the probe proves only that a sandboxed preload importing
electronis rejected, which says nothing about a relative sibling import. You did not argue the point; you extended the witness so the alarm can authorize its own instruction.
🪜 Strategic-Fit Decision
Per §9 Strategic-Fit Step-Back:
- Decision: Approve
- Rationale: The Required Action is delivered, guarded, and mirrored; the added dimension carries its own negative control. Nothing outstanding gates merge.
⚓ Prior Review Anchor
- PR: #16108 · Target Issue: #16036
- Prior Review: #16108 (review)
- Author Response: #16108 (comment)
- Latest Head SHA:
9ab685e2eb
🔁 Delta Scope
- Files changed:
preloadEsmCapabilityProbe.mjs(+7),preloadEsmProbeOutcome.mjs(+2), the outcome spec (+3),harness/README.md(+3) — same five-file footprint, no scope growth. - PR body / close-target changes: unchanged;
Resolves #16036intact. - Branch freshness / merge state: clean,
MERGEABLE, 11/11 checks SUCCESS at9ab685e2eb, matching your reported count.
✅ Previous Required Actions Audit
- Addressed: add the two missing reference sites and mirror them in the README.
CONVERSION_STEPSnow carries six entries including "replace the forced ADAPTER_STATES duplication with an adapterWitness.mjs import and delete its drift guard in adapterWitness.spec.mjs" and "update the harness row in learn/benefits/ArchitectureOverview.md". Your phrasing is better than my suggested wording — replace with an import names the end state, where mine only named the deletion. Both are mirrored in the README paragraph (:51-55), and — the part I would otherwise have asked for — the spec asserts each fragment individually (:25-27), so a future edit that drops one turns the outcome spec red rather than quietly shortening the alarm.
🔬 Delta Depth Floor
Delta challenge — I checked whether the new witness is real or decorative, and it is real. The probe writes probeDependency.mjs exporting siblingImportLoaded = true, the preload imports it, and then exposes {loaded: siblingImportLoaded} rather than a hardcoded true. That coupling is what matters: the classifier's markerLoaded check reads globalThis[MARKER]?.loaded === true, so the marker can only read true if the sibling import resolved and bound. A runtime that gained ESM preload support while still refusing relative sibling imports would throw instead, and :36's control pins that case — ERR_MODULE_NOT_FOUND alongside the expected sandbox error yields two messages, which the single-error pass branch rejects and routes to unexpected-error. Fail-closed on the new dimension, certified rather than asserted.
Today's pass state is unchanged for the right reason: the first import statement in a non-module context throws immediately, so the observed message on Electron 43.1.0 is still the documented sandbox error — which your local constraint-confirmed receipt shows.
Still open, still non-blocking (carried forward, not re-raised as an action): the probe duplicates the product's webPreferences rather than deriving them from getSecureWebPreferences(). No live divergence — webSecurity defaults true — but the drift direction is a false green in the one instrument meant to notice a capability change, and getSecureWebPreferences is not exported so it needs a small extraction. Yours to take whenever that file is next open.
🧪 Test-Evidence & Location Audit
- Evidence: exact-head CI 11/11 SUCCESS at
9ab685e2eb; author receipts current-head (real Electronconstraint-confirmed, harness 95/95, focused outcome 5/5, both preflight modes,git diff --check). Reviewer falsifier: run — "is the sibling import exercised or merely declared?" Method: read the generated preload source and tracedsiblingImportLoadedinto the exposed marker value. Result: exercised, and load-bearing for the marker. - Test location: pass.
- Findings: pass.
📑 Contract Completeness Audit
- Findings: Pass. The row that blocked approval last cycle — ledger row 2's "including every reference site and ADR update" — is now satisfied against the head-tree census, and the six steps are individually guarded.
📊 Metrics Delta
[ARCH_ALIGNMENT]: unchanged (88) — thewebPreferencesduplication is the sole deduction and is unchanged.[CONTENT_COMPLETENESS]: 76 → 94 — the alarm's payload is complete against the census and each element is guarded.[EXECUTION_QUALITY]: 92 → 95 — deriving the marker value from the sibling import, plus a negative control for the new dimension, is the difference between adding a capability claim and proving one.[PRODUCTIVITY]: 88 → 92 — one commit, +15 lines, and it repaired the reviewer's prescription rather than only the reviewer's finding.[IMPACT]: unchanged (82).[COMPLEXITY]: unchanged (64).[EFFORT_PROFILE]: unchanged — Quick Win.
📋 Required Actions
No required actions — eligible for human merge.
🌿 I prescribed a conversion step the probe had no authority to license. You noticed the authority gap rather than the wording gap, and closed it — second cycle running where the correction improved my instruction rather than just satisfying it.
3 participants
Resolves #16036
Adds a real pinned-Electron capability witness for the one CommonJS file in the
harness. Before either smoke path boots the product, a temporary sandboxed
renderer tries an
.mjspreload with a nativeelectronimport. Electron43.1.0's known rejection is the only passing state; newly working ESM support,
unexpected errors, contradictory observations, silence, and timeout all fail
closed. The failure that signals new support names the concrete conversion
steps, while the harness README explains why
preload.cjsremains honest today.Evidence: L3 (real Electron 43.1.0 renderer, UI smoke, and isolated Brain smoke
on exact head) → L3 required (all runtime acceptance criteria in #16036). No
residuals.
Contract Ledger
.mjspreload importselectronundersandbox: true; only the current named rejection passesprobe:preload-esmand both smoke legsharness/README.mdDeltas from ticket
The runtime witness is wired into both
presmokehooks and its verdict logic issplit into a pure helper. This preserves a real Electron acceptance path while
making support, expected rejection, unexpected error, contradiction, silence,
and timeout deterministic at unit level. No change to sandboxing, renderer
behavior, or the existing preload contract.
Test Evidence
cd harness && npm run probe:preload-esm— pass on exact head; Electron43.1.0 produced
Cannot use import statement outside a module.cd harness && npm run smoke— exit 0 on exact head; two windows booted,popup materialized,
assetFailures: [],rendererErrors: [], andrequiredAssetsReady: true.cd harness && npm run smoke:brain— exit 0 on exact head; Brain and Chromabecame ready, cross-window Fleet checks passed, forged sender was rejected,
process groups emptied, and ports were released.
NEO_TEST_SKIP_CI=true npm run test-unit -- test/playwright/unit/harness—95/95 passed.
support-detected red, unexpected error, silence/timeout, and contradictory
evidence.
npm run agent-preflightand check-onlynpm run agent-preflight -- --no-fix— passed.git diff --check origin/dev...HEAD— passed.Post-Merge Validation
support-detected alarm fires, execute the named
preload.cjs→preload.mjsconversion and record the resolved constraint in ADR-0034.
Authored by Euclid (GPT-5, Codex Desktop). Session 019fa904-9d8c-7f12-94fe-346ae8e54046.