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Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-20 23:52:15 +09:00

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title

Sequence Diagram

매 한 줄

"매 시간 축으로 actor 간 message 주고받음 시각화". 매 UML 의 dynamic behavior 다이어그램, 매 distributed system / API 흐름 / agent loop 설명에 매 standard. 매 2026: AI agent 가 code → diagram 자동 생성 (Claude, Mermaid Chart, Eraser AI), 매 text-as-code (Mermaid) 가 GUI tool 보다 dominant.

매 핵심

매 element

Lifeline: 매 actor / object 의 vertical line.
Message: 매 horizontal arrow (sync solid, async dashed, return dotted).
Activation bar: 매 처리 중 vertical bar.
Combined fragment: alt / opt / loop / par / critical.
Note: 매 inline annotation.

매 vs 다른 다이어그램

Flowchart: control flow, no actors. 매 single perspective.
Activity diagram: state machine 비슷, branching 강조.
Component diagram: static structure.
Sequence: 매 dynamic interaction over time — "누가 누구에게 언제".

매 응용

API contract docs (REST/gRPC handshake).
Auth flow (OAuth, OIDC, SAML).
Distributed transaction (saga, 2PC).
AI agent loop (user → LLM → tool → LLM → user).
Bug reproduction trace.
Onboarding 신입 — 매 system overview.

💻 패턴

Mermaid basic

sequenceDiagram
    participant U as User
    participant A as App
    participant DB
    U->>A: GET /profile
    A->>DB: SELECT * FROM users
    DB-->>A: row
    A-->>U: 200 OK (json)

Mermaid with alt/loop

sequenceDiagram
    actor User
    participant API
    participant LLM
    User->>API: question
    loop until done
        API->>LLM: prompt
        LLM-->>API: tool_call
        alt tool == search
            API->>SearchAPI: query
            SearchAPI-->>API: results
        else tool == done
            API-->>User: final answer
        end
    end

PlantUML

@startuml
actor Client
participant "Auth Service" as Auth
participant "Resource API" as API
Client -> Auth: POST /token (creds)
activate Auth
Auth --> Client: JWT
deactivate Auth
Client -> API: GET /data (Bearer JWT)
API -> API: verify JWT
API --> Client: 200 data
@enduml

Generate from code (Claude)

import anthropic
c = anthropic.Anthropic()
diagram = c.messages.create(
    model="claude-opus-4-7",
    max_tokens=2048,
    messages=[{
        "role": "user",
        "content": f"Generate a Mermaid sequenceDiagram from this code:\n```python\n{src}\n```",
    }],
).content[0].text

Embed in MkDocs / GitHub README

```mermaid
sequenceDiagram
    A->>B: ping
    B-->>A: pong
```

Mermaid CLI render

npx -p @mermaid-js/mermaid-cli mmdc -i flow.mmd -o flow.svg -t dark

OAuth 2.0 PKCE 매 example

sequenceDiagram
    participant App
    participant Browser
    participant Auth as AuthServer
    App->>Browser: redirect /authorize?code_challenge
    Browser->>Auth: login
    Auth-->>Browser: redirect ?code=
    Browser->>App: code
    App->>Auth: POST /token (code, code_verifier)
    Auth-->>App: access_token

매 결정 기준

상황	Approach
README / GitHub / Notion	Mermaid (native render)
Detailed UML (combined fragments)	PlantUML
Whiteboard 빠르게	Excalidraw
Auto-from-code	Claude / Eraser AI
Live trace	OpenTelemetry → Jaeger trace view

기본값: Mermaid in markdown.

🔗 Graph

변형: Component-Diagram
Adjacent: Mermaid · PlantUML · Distributed-Tracing

🤖 LLM 활용

언제: code/log → diagram 자동화, refactor 후 docs 갱신, agent flow 설명. 언제 X: 매 매우 복잡한 system — 단일 sequence diagram 으로 부족, 매 break down.

❌ 안티패턴

너무 많은 lifeline (>7): 매 cognitive overload — split.
모든 detail 포함: 매 high-level abstraction 우선.
Static structure 표현: 매 잘못된 diagram type — component diagram 사용.
Out of date: code 와 sync 안 됨 → CI 에서 lint.

🧪 검증 / 중복

Verified (UML 2.5 spec, Mermaid docs, PlantUML docs).
신뢰도 A.

🕓 Changelog

날짜	변경
2026-05-08	Phase 1
2026-05-10	Manual cleanup — Mermaid + AI gen 2026

4.6 KiB Raw Blame History