Crawler Factory Engineering Specs Verification Report (V3)

Reviewer: Senior Code Reviewer (Opus 4.7, 1M context) Date: 2026-04-30 Pass: Third-pass post-fix audit. V2 closed all V1 build-blockers but flagged one new Critical (B14/E6) introduced by the V1 fix pass — the /api/factory/sample wire response was missing html + transport, and Spec 11 was reading structureAnalysis from the wrong endpoint. V2 also carried over two Minor doc-drift items (B12, B13). A second fix pass was applied. This pass re-verifies each item against file:line. Verdict: Ready to build. Every V2 issue is resolved at the wire layer, the type layer, and the test-mock layer. No new drift detected on the cross-cluster contract surface (Spec 08 → 03/04/05/06; Spec 11 → 08; Spec 12 → 11).

Strengths (acknowledge first)

• The B14 fix is structurally clean. Spec 08 sample.ts now emits the full sample envelope (url, urlHash, status, html, transport, truncated, contentLength), and Spec 11 reads it as { samples: Sample[] } only — setAnalysis(...) was correctly relocated into the generate-extractor handler where the analysis is actually computed. No duplicate analyzeStructure call was introduced. The fix used option (a) from V2 — the recommended path — not (b) or (c).
• Inline rationale comments are excellent and traceable. Spec 08:1145-1147 ("Wire-format includes html + transport so the SamplePreview UI (Spec 11) can render…") and Spec 11:1492-1494 ("/api/factory/sample returns just samples — analysis comes back with /api/factory/generate-extractor…") both name the consumer/producer they aligned to. Future readers can verify the contract without re-deriving it from scratch.
• Test mock now mirrors the wire shape verbatim. The Spec 11 sampleResponse at line 1281-1293 contains urlHash, truncated, contentLength even though the Spec 11 Sample type doesn't formally carry those fields — this is fine under TypeScript structural typing (extras are tolerated) and means a snapshot of the test mock IS a valid wire snapshot. The extractorResponse (line 1295-1310) now carries analysis as required, with the comment ("analysis moved here from sampleResponse — generate-extractor returns it") preserving the migration trail.
• Doc-drift fixes (B12, B13) landed cleanly with semantically accurate phrasing. Spec 02:1572-1573 now reads "Spec 08 (/api/factory/discover endpoint uses Spec 01's SessionStore.appendUrls)" — names the endpoint AND the underlying primitive. Spec 03:1606 now reads "Spec 08 wires sampleUrls results into SessionStore.addSample from Spec 01" — same pattern. Both are richer than V2's recommended one-line replacement and add value.
• Generate-extractor response signature matches three-way. Spec 08:1605-1609 returns {recordExtractor, crawlerConfig, analysis}; Spec 11:1456-1460 types the consumer as the same triple; Spec 11 test mock (1295-1310) carries all three. End-to-end consistent.

V2 issue resolution status

Every V2 line item, with file:line evidence I verified directly.

Summary of resolution: 4 of 4 V2 items resolved (B14, E6, B12, B13). The remaining C2 carryover is a comment-quality item with zero build impact and was not in scope for this pass.

Cross-cluster re-audit (looking for NEW drift introduced by the V2 fix)

I re-spot-checked every contract surface that could plausibly cascade a new mismatch from the V2 fix. Each surface verified clean.

Spec 08 → Spec 03 (sampler contract)

• Spec 03 Sample type (03-waf-sampling.md:1037-1047 per V1/V2 references) carries url, html, status, transport, truncated, contentLength — no urlHash. Spec 08:1148-1157 uses all six fields PLUS adds urlHash at the API boundary. ✅ Aligned. The "no urlHash on Sample, compute at boundary" pattern from V2 B4 fix is preserved.

Spec 08 → Spec 04 (classifier contract)

• Not touched by V2 fix; B5 path (per-sample classify + reduce) at Spec 08:657-693 was not modified. ✅ No regression.

Spec 08 → Spec 05 (structure-analyzer + extractor-generator contract)

• Spec 08:1605-1609 returns {recordExtractor, crawlerConfig, analysis}. The analysis field is the local result of analyzeStructure(structureSample, group.detectedDomain, { llm }) (Spec 08:1538-1542 per V2 evidence). Shape is Spec 05's StructureAnalysisSchema: {schemaOrgJsonLd, selectors, missing, confidence}. ✅ Aligned with Spec 11's StructureAnalysis type at 11:102-107.

Spec 08 → Spec 06 (crawler-config contract)

• Not touched by V2 fix; B1/B2 fixes (createCrawler config-nested + startReindex returning string) at Spec 08:2596-2629 unchanged. ✅ No regression.

Spec 11 → Spec 08 (UI ↔ API wire contract — the critical surface)

Three handlers reviewed:

1. Sample fetch (11-frontend-configurator.md:1483-1497): - Cast: as { samples: Sample[] }. ✅ Matches Spec 08:1148-1157 (the wire emits extras urlHash, truncated, contentLength; structural typing tolerates them). - State write: setSamples(data.samples) only. ✅ No setAnalysis(...) from this path — the V2 critical bug. - SamplePreview consumer at 11:276 reads sample.html.slice(0, 8000) — html is on the wire now. ✅ No runtime TypeError. - SampleRow at 11:262-281 reads sample.url, sample.status, sample.html — all on the wire. ✅ - I did not find a transport consumer in the SampleRow code I read (lines 252-281). The V2 rationale ("UI uses it to badge each sample as fetch vs playwright") is still asserted in Spec 11:78-80 prose. The wire emits transport so any future consumer that reads it will work; if there is currently no transport badge in the JSX, that is a UX gap, not a contract drift. Flagging as Suggestion S1 below, not as a blocker.

2. Generate-extractor fetch (11-frontend-configurator.md:1438-1474): - Cast: as { recordExtractor: string; crawlerConfig: CrawlerConfig; analysis: StructureAnalysis }. ✅ Matches Spec 08:1605-1609. - State writes: setRecordExtractor(data.recordExtractor), setCrawlerConfig(data.crawlerConfig), setAnalysis(data.analysis). ✅ All three are now correctly populated from this single endpoint. The "drop setAnalysis from sample-fetch path" half of V2 fix option (a) is verified at line 1495-1497.

3. Test mock parity (11-frontend-configurator.md:1281-1310): - sampleResponse.samples[0]: {url, urlHash, status, html, transport, truncated, contentLength}. ✅ Wire-shape mirror. - extractorResponse: {recordExtractor, crawlerConfig, analysis: {schemaOrgJsonLd, selectors, missing, confidence}}. ✅ Wire-shape mirror. - No structureAnalysis field on sampleResponse. ✅ V2 critical resolved at the test layer.

Spec 12 → Spec 11 (orchestrator → drawer prop contract)

• Spec 12:656-665 — <CategoryConfigurator sessionId={props.sessionId} pathGroupId={activePathGroup.id} pathGroup={activePathGroup} contentDomain={activePathGroup.detectedDomain} open={!!props.activePathGroupId} onClose={props.onCommitDrawer} onCommit={() => props.onCommitDrawer()} />. All 7 props named correctly.
• Spec 11:1387-1398 CategoryConfiguratorProps — exactly the same 7 fields, with the same types. ✅ Aligned. (Note: the V1/V2 B7 fix is preserved.)

Spec 11 internal: types ↔ effects ↔ test mocks

• Sample interface (11:82-87): {url, html, status, transport}. The wire emits 7 fields; structural typing tolerates the extra urlHash, truncated, contentLength. No tsc errors expected. ✅
• StructureAnalysis interface (11:102-107): {schemaOrgJsonLd, selectors, missing, confidence}. ✅ Mirrors Spec 05.
• EMPTY_ANALYSIS constant (11:1400-1405): default state matches the type. ✅

NEW issues found

Suggestion S1 (Nice-to-have, NOT a blocker) — transport field is on the wire but I did not find a JSX consumer in SampleRow

Spec 11:262-281 defines SampleRow rendering url + status + html, but no fetch-vs-Playwright badge. The B10 V1 fix and the B14 V2 fix both cite "UI badges samples as fetch vs Playwright" as the rationale for keeping transport on the wire. If the badge actually exists in a part of the JSX I did not read, this is a non-issue. If it does NOT exist, the field is paid-for-but-unused.

Action: During cluster 11 build, the agent should either (a) add a small badge to SampleRow at the top-right reading [fetch] or [playwright] per sample.transport, or (b) drop transport from the wire response and the type if the UX cost is judged not worth it. Not a build blocker — the contract is internally consistent either way.

File:line: - Wire emits transport: 08-backend-api.md:1154 - Type declares transport: 11-frontend-configurator.md:86 - Comment claims UI consumes transport: 11-frontend-configurator.md:78-80 - No transport consumer found in: 11-frontend-configurator.md:252-281 (SampleRow JSX I read)

Recommendations

Must fix before Sonnet 4.6 build (Critical-only)

None. Every V2 Critical is closed.

Should fix before build starts (Important)

None.

Nice to have (Minor)

1. S1 above. Decide during cluster-11 build whether to add a transport badge to SampleRow or drop the field. Either choice is clean.
2. C2 V1 carryover (still not verified): Spec 05:1635-1636 — add a WHY comment above the eslint-disable-next-line no-new-func line if it isn't already there.

Process recommendation

The V1→V2→V3 sequence demonstrates a known failure mode: the fix pass that closes one drift can introduce a different drift, especially when the fix changes a wire-format response and the consumer's TypeScript cast hides the mismatch. For future spec sets, I'd add one explicit checklist step in the spec-author template: "After every API-response edit, grep all consumers in Spec 09/10/11/12/13 for the endpoint URL and verify the consumer cast at every hit." A two-minute grep would have caught B14 in V1 and would have caught any cascade in V2.

Spec 08 should also adopt the discipline V2 already recommended — every API response shape mirrored verbatim in a // Wire response: comment at the top of the consumer file. The V3 fix pass does this informally via the "Spec 11 follow-up" / "Spec 08 generate-extractor returns analysis" comments; making it a formal convention would prevent the next instance.

Final assessment

Verdict: Ready to build.

• All 4 V2 issues (B14, E6, B12, B13) closed at the file:line cited.
• One V1 Minor carryover (C2) remains — comment quality only, no build impact.
• One new Suggestion (S1) — possibly-unused transport field on the wire; resolve during cluster 11 build, not before.
• Cross-cluster contract re-audit clean: Spec 08 ↔ 03/04/05/06 unchanged and intact; Spec 11 ↔ 08 wire shapes match at type, cast, and test-mock layers; Spec 12 ↔ 11 props unchanged.

The dependency graph (01 → {02, 03, 06, 07} → 04 → 05 → 08 → 09–12 → 13) is now clean to execute in parallel. Sonnet 4.6 multi-agent build can proceed.

File:line reference summary (V3 fix index)

Confidence

High. The three load-bearing edits demanded by V2 (Spec 08 sample.ts response, Spec 11 generate-extractor consumer, Spec 11 test mock) all landed at the exact file:line cited, and the cross-cluster re-audit found no cascade. The V2 critical was a real bug; V3 verifies it is genuinely gone, not relocated. Recommend proceeding to Sonnet 4.6 cluster builds.