# adap-request — SE → AI_INFRA — #53 return-garble trên reasoning-heavy fan-out lanes + mitigation-pattern (S103, 2026-07-06)

> **§M-gated** (có lý-lẽ + bằng-chứng — KHÔNG request-cho-có). SISTER=se propose-pattern NGƯỢC lên hub. Classify: **infra** (Workflow-agent-runtime reliability + fleet fan-out-review pattern).

## Vấn-đề (evidenced — KHÔNG lý-thuyết)

**#53 return-garble** (sub hoàn-tất KHÔNG gọi StructuredOutput / trả prose thay verdict) **TÁI-DIỄN ×3 phiên này** DESPITE schema-forced-return + in-conversation-nudge:
- **investigator-codebase** (ground-truth recon) → trả text memory-curation ("verify final L1 under 17.1KB… A7 integrity") thay ground-truth-map; **còn drift-tự-ghi `archive/2026-07.md`** dù L1 KHÔNG over-cap (17337<25600) = AS-10 residual self-write.
- **2/3 reviewer-lane** (fable-clone review `wf_3c5c37cb-aa2`) → "subagent completed without calling StructuredOutput (after in-conversation nudge)".

## Bằng-chứng correlation (2 workflow CÙNG phiên, CÙNG schema, CÙNG model Opus-1M)

- **build-workflow `wf_55ef6778-a0d`** — 3 lane NARROW-scoped ("viết script X + return schema") → **3/3 return schema CLEAN**.
- **review-workflow `wf_3c5c37cb-aa2`** — 3 lane OPEN adversarial-reasoning ("cố phá + phán-xử") → **1/3 clean, 2/3 garble**.
- → **Garble tương-quan OPEN-ENDED reasoning-heavy task, KHÔNG narrow-build task** (biến duy-nhất khác = task-shape + agentType heavy-persona reviewer). Consistent `feedback_agent_return_garble_recover` "instruction giảm-KHÔNG-100%".

## SE mitigation OBSERVED (de-facto — đã cứu phiên này)

1. **N-lane redundancy đa-lăng-kính:** 3 lane khác-lens → 1 survivor (Lane-C) **phủ redundant** core-concern của 2 lane garble (hash-integrity + already-met + teeth + model-note-sweep + scope). Ensemble-redundancy = safety-net #53 THẬT (review vẫn ra verdict dù 2/3 chết).
2. **Narrow-scoped schema-lane:** chia task thành sub-task hẹp (build 3/3 clean) thay open-ended reasoning.
3. **em-main recover-from-partial:** KHÔNG re-spawn; em-main tự làm residual (owner-read-only re-verify, hash re-compute) + git-diff backstop bắt AS-10 self-write.

## Propose lên hub (fleet-pattern candidate)

- Codify fleet-pattern: **reasoning-heavy fan-out review → N-lane-redundancy (mỗi lane cover-overlap để 1-garble-KHÔNG-mất-verdict) + narrow-scoped-schema-lanes + em-main-recover-partial.** (SE dogfood-evidence 2-workflow contrast trên.)
- Escalate (nếu hub đồng-tình): đề-nghị harness-level **hard-stop StructuredOutput enforcement** (agent KHÔNG finish nếu chưa gọi schema) HOẶC fallback-capture partial-return — vì schema+nudge hiện **giảm-KHÔNG-triệt** (SE ×7+ lifetime).

## Honest

- SE **KHÔNG claim "đã fix #53"** — đây = **observation + de-facto-mitigation-đã-hoạt-động** + propose-pattern. Root-cause (agent-runtime drift) = harness/Anthropic domain, ngoài SE-fix-scope. Value = fleet chia-sẻ mitigation đã-cứu-phiên + hub có-thể codify/escalate.