sysdesign-sdd

name	sysdesign-sdd
description	Promote a filled mock-interview.md into a formal Software Design Document (sdd.md) following the IEEE 1016 / Atlassian / Google design-doc style. Activated when the user says they are ready to write the SDD. Reads the topic's mock-interview.md AND the topic's conversation log files (which capture the back-and-forth detail not preserved in the structured mock-interview), then asks the user the SDD-specific questions that mock-interview doesn't cover (Constraints, ADRs, Risk Register, Rollout, Testing strategy). Writes sdd.md incrementally as decisions land.
triggers	["SDD 작성","sdd 작성","sdd 만들","sdd로 넘어가","SDD로 넘어가","정식 설계 문서","정식 설계 문서 만들","software design document","설계 문서 정리","설계 문서 작성","design document 작성","design doc 만들"]
allowed-tools	Read, Write, Edit, Glob, Grep, Bash

sysdesign-sdd — Phase 5 (Formal SDD)

You are promoting a working mock-interview into a formal SDD that another engineer (or future-you) could pick up six months later. The mock-interview captures decisions; the SDD captures decisions + their rationale + risks + rollout + traceability.

Operating procedure

Step 0. Identify active topic

TOPIC=$(cat .omc/state/active-sysdesign-topic.txt 2>/dev/null)

If empty → ask user which topic. If non-empty, confirm: "현재 활성 토픽: <TOPIC>. 이 토픽의 SDD 작성한다. 맞지?"

Step 1. Inventory inputs

For the active topic, locate and read in this order:

1. <TOPIC>/System-Design-Document/mock-interview.md — primary structured input. If missing, abort: "mock-interview.md가 없어. 먼저 sysdesign-design으로 채우자."

2. Conversation logs — <TOPIC>/conversation-log/*.log (glob all available). The retention policy means at most ~14 days of history; report what's available:

   ls -la "$TOPIC/conversation-log/" 2>/dev/null
   

   Tell user: "사용 가능한 로그: {N개 파일, {oldest_date} ~ {newest_date}}. 이 범위 외 작업이 더 있었다면 알려줘 — 백업본 위치 등."

3. templates/System-Design-Document/software-design-document-style.md — the SDD template structure (do NOT copy this verbatim; use as section reference).

Step 2. Bootstrap sdd.md

If <TOPIC>/System-Design-Document/sdd.md does NOT exist, copy the template:

cp templates/System-Design-Document/software-design-document-style.md \
   "$TOPIC/System-Design-Document/sdd.md"

If it exists, the user is resuming an SDD draft — read its current state and pick up from the first un-filled {...} placeholder.

Step 3. Migrate from mock-interview.md (auto-fill what you can)

Read mock-interview.md and conversation logs together. Bulk-fill the SDD sections that have a 1:1 source:

SDD section	Source
§1.1 Purpose / §1.2 Scope	mock-interview §1 (Functional + Out-of-Scope)
§2 System Overview	mock-interview §2.4 (Architecture Diagram) + intro paragraph from logs
§3.1 Goals	mock-interview §1.2 (NFRs as quantified goals — "p99 < 100ms" → "G-1: API p99 latency < 100ms")
§5 System Architecture	mock-interview §2.4 + logs (architectural style: monolith vs microservices — infer from logs or ask)
§6 Data Design	mock-interview §2.2 (Core Entities) + §3.1 (DB choice + sharding + replication)
§7 Component Design	mock-interview §3.x (each component) — flesh out Inputs / Outputs / Dependencies / Core Logic
§8 Interface Design	mock-interview §2.3 (API Contract) — add Request/Response/Errors columns
§9 NFRs	mock-interview §1.2 — add Acceptance Criteria column
§10 Cross-Cutting	mock-interview §3.5 / §3.6 / §3.7 (Failure Modes / Monitoring / Security)

After bulk fill, surface to user: "기본 골격 채웠어. 이제 SDD에만 있는 항목 차례로 물어볼게."

Step 4. Ask SDD-only questions (one section at a time)

Walk the user through the SDD-specific sections. Don't dump 20 questions at once — one section per turn, wait for answer, fill, move on.

Order (matches software-design-document-style.md):

1. §3.2 Non-Goals — "이 SDD에서 명시적으로 안 다룰 거 뭐가 있어? (예: 멀티 리전, 자체 ML)"
2. §4 Constraints — Technical / Organizational / Regulatory
   • "회사 표준 스택 강제? (예: Java 21, Spring Boot)"
   • "팀 규모 / 예산 상한?"
   • "GDPR / PCI / HIPAA 같은 규제 적용?"
3. §5.3 Deployment Topology — "Runtime은? K8s? ECS? Lambda? 단일 리전?"
4. §6.3 Data Lifecycle — Creation / Retention / Archival / Deletion 4단계
5. §11 ADRs — 가장 중요한 결정 3–5개. mock-interview에서 "선택 근거"가 적힌 곳을 ADR로 변환하자고 제안:
   • "mock-interview에서 'PostgreSQL (강한 일관성 + 단순 access pattern)' 같은 결정이 있었어. 이거 ADR-001로 만들까? Status / Context / Decision / Consequences 형식으로 정리할게."
6. §12 Alternatives Considered — 거절된 대안들. 로그에서 후보 추출 가능한 경우 자동 채우고 사용자 확인.
7. §13 Risk Register (선택) — "운영 위험 식별할까? (likelihood/impact/mitigation/owner)"
8. §14 Requirements Traceability (선택) — FR/NFR ↔ §7/§8 + Test Case ID 매핑
9. §15 Testing Strategy — Unit / Integration / E2E / Load / Chaos / Acceptance. sysdesign-impl 단계에서 어떤 테스트만 우선 자동화할지도 같이 정함.
10. §16 Rollout — Phased rollout / Feature flags / Data migration / Rollback 트리거. 단순 연습 프로젝트면 "skip"으로 합의 가능 — 사용자 의사 확인.
11. §17 Glossary — 도메인 약어 / 용어. 로그에서 빈출 약어 자동 추출 후 정의 요청.

Step 5. Update Revision History

매 turn 끝에 §0.1 Revision History 업데이트:

| 0.1 | 2026-05-04 | (사용자 이름 또는 'collab') | Initial draft from mock-interview migration |
| 0.2 | 2026-05-04 | collab | ADR-001 to ADR-003 added |
| ... |

Step 6. Sign-off

When all sections (or all the sections the user wants) are filled, run the SDD checklist from software-design-document-style.md 부록 and report:

"✓ SDD 초안 완료. <TOPIC>/System-Design-Document/sdd.md. 부록 체크리스트 결과:

• Goals 측정 가능
• Non-Goals/Constraints 분리
• Risk Register — skipped (사용자 합의)
• ...

검토해서 수정/추가하고 싶은 거 있으면 알려줘. 구현으로 넘어가려면 '구현하자' / '최소 구현 만들자' 라고 하면 sysdesign-impl로 진입."

Hard rules

Rule	Why
Bulk-fill first (Step 3), then ask only what mock-interview doesn't have.	사용자가 같은 정보 두 번 말하면 안 됨.
One SDD-only section per turn (Step 4).	Q 20개 한 번에 던지면 답변 품질 떨어짐.
Always check log files for context — they have the rationale that mock-interview's bullet form lost.	mock-interview는 "결정 결과" / 로그는 "왜 그렇게 결정했는지".
Update §0.1 Revision History every turn.	SDD가 팀 자산이 되려면 변경 추적 필수.
Never reduce mock-interview content. SDD is augmentation.	Loss of decisions = bug.
If a log file referenced earlier is now missing (3-day catchall window passed before topic was set), surface the gap explicitly.	User must know what's reconstructed vs documented.
ADRs cite mock-interview turn or log timestamp as source.	Traceability.