refactor(topics): 멀티 에이전트용 지식 재편 — _Common(공통 기본기) + Domain_* 구조
에이전트 8종(대화형/프로그래머 C·S/디자이너/설계자/기획자/QA/PD/PM)에게 [공통 기본 능력 + 롤별 Specialty] 2층으로 지식을 주입하기 위한 재분류. 문서 내용·포맷은 무수정, 폴더 이동만 (6,372개 문서 수 보존 확인). - Topic_Programming → Domain_Programming (내부 구조 보존) - Topic_Graphic → Domain_Design - Topic_Business → Domain_Product - Topic_General → Domain_General - _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning), Reasoning_Creativity(구 General/From_창의성), Communication(Poetic_Blog_Writing + From_writing) - 타 도메인의 From_* 폴더는 유지 (출처 표기일 뿐, 이미 도메인에 맞게 분류된 문서) - 빈 폴더 정리 (memory/procedures) - 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Antigravity Agent
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---
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id: wiki-2026-0508-api-first-architecture
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title: API-First Architecture
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category: 10_Wiki/Topics
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status: verified
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canonical_id: self
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aliases: [API-first design, Contract-first, Schema-first]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.9
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verification_status: applied
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tags: [architecture, api, openapi, contract-first, design]
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raw_sources: []
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last_reinforced: 2026-05-10
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github_commit: pending
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tech_stack:
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language: yaml
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framework: OpenAPI 3.1, Stoplight, Spectral, buf
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---
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# API-First Architecture
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## 매 한 줄
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> **"매 API spec 의 first artifact — code follows contract"**. 매 design-first → spec → mock → impl 매 separate workflow. 매 Swagger (2010) → OpenAPI 3.0 (2017) → 3.1 (2021, JSON Schema 2020-12 align) → AsyncAPI 2.6/3.0 (events) → buf (gRPC). 매 2026 modern stack 은 spec-driven codegen + lint (Spectral) + breaking change detection (buf, oasdiff) + AI-assisted spec (Claude Opus 4.7).
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## 매 핵심
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### 매 workflow
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1. **Design**: write OpenAPI/proto spec 매 먼저.
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2. **Review**: stakeholders (FE/BE/partner) review spec, not code.
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3. **Mock**: Prism/Stoplight serve mock from spec.
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4. **Generate**: SDK (oapi-codegen, openapi-typescript), server stubs.
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5. **Implement**: fill stubs, validate at runtime.
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6. **Test**: contract tests against spec.
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7. **Govern**: lint (Spectral), diff (oasdiff), versioning.
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### 매 vs code-first
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- **Code-first**: write handler → annotate → generate spec. Drift risk, late stakeholder feedback.
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- **API-first**: write spec → generate handler → fill. Single source of truth.
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### 매 응용
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1. **Public SaaS API** — Stripe-style spec-driven.
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2. **Multi-platform SDK distribution** — auto-generated TS/Python/Go/Java clients.
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3. **Frontend/backend parallel dev** — FE works against mock from day 1.
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4. **B2B integration contracts** — partners review spec before impl.
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## 💻 패턴
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### OpenAPI 3.1 spec
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```yaml
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openapi: 3.1.0
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info: { title: Orders API, version: 1.0.0 }
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paths:
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/orders/{id}:
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get:
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operationId: getOrder
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parameters:
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- { name: id, in: path, required: true, schema: {type: string} }
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responses:
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"200":
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description: OK
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content:
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application/json:
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schema: { $ref: "#/components/schemas/Order" }
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"404": { $ref: "#/components/responses/NotFound" }
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components:
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schemas:
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Order:
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type: object
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required: [id, status]
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properties:
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id: { type: string, format: uuid }
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status: { type: string, enum: [pending, paid, shipped] }
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total: { type: number, minimum: 0 }
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```
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### Mock server (Prism)
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```bash
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npx @stoplight/prism-cli mock spec.yaml --port 4010
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# Now FE devs hit http://localhost:4010/orders/123 with realistic responses
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```
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### Spectral lint config
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```yaml
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# .spectral.yaml
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extends: [[spectral:oas, all]]
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rules:
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operation-operationId-unique: error
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operation-tag-defined: error
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no-eval-in-markdown: error
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custom-versioned-path:
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given: "$.paths"
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severity: error
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then:
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function: pattern
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functionOptions: { match: "^/v\\d+/" }
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```
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### Type-safe client (openapi-typescript)
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```bash
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npx openapi-typescript spec.yaml -o src/api-types.ts
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```
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```typescript
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import createClient from "openapi-fetch";
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import type { paths } from "./api-types";
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const client = createClient<paths>({ baseUrl: "https://api.example.com" });
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const { data, error } = await client.GET("/orders/{id}", {
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params: { path: { id: "abc" } },
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});
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// data: Order | undefined, fully typed
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```
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### Server stub (oapi-codegen, Go)
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```bash
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oapi-codegen -package api -generate types,server spec.yaml > api/api.gen.go
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```
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```go
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type ServerImpl struct{ db *sql.DB }
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func (s *ServerImpl) GetOrder(c echo.Context, id string) error {
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var o Order
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if err := s.db.QueryRow("SELECT ...").Scan(...); err != nil { ... }
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return c.JSON(200, o)
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}
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```
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### Breaking change detection (oasdiff)
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```bash
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oasdiff breaking spec-v1.yaml spec-v2.yaml --fail-on ERR
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# CI gate: blocks PR if breaking change without major version bump
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```
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### AsyncAPI for events
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```yaml
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asyncapi: 3.0.0
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info: { title: Orders Events, version: 1.0.0 }
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channels:
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orderCreated:
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address: orders.created
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messages:
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OrderCreatedMessage:
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payload:
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$ref: "#/components/schemas/Order"
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operations:
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publishOrderCreated:
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action: send
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channel: { $ref: "#/channels/orderCreated" }
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```
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### buf for gRPC governance
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```yaml
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# buf.yaml
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version: v2
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modules:
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- path: proto
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breaking:
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use: [FILE]
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lint:
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use: [DEFAULT]
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except: [PACKAGE_VERSION_SUFFIX]
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```
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## 매 결정 기준
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| 상황 | Spec |
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|---|---|
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| HTTP REST, public | OpenAPI 3.1 |
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| Async events | AsyncAPI 3.0 |
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| gRPC | proto + buf |
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| GraphQL | SDL + Apollo Federation |
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| Internal-only, single team | Code-first (faster iteration) |
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**기본값**: 매 OpenAPI 3.1 + Spectral lint + Prism mock + openapi-typescript codegen + oasdiff CI.
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## 🔗 Graph
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- 부모: [[API Fundamentals]]
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- 응용: [[OpenAPI]]
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- Adjacent: [[Consumer-Driven Contracts]] · [[API Gateway]]
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## 🤖 LLM 활용
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**언제**: 매 multi-team API, 매 public SDK distribution, 매 partner integration, 매 FE/BE parallel dev.
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**언제 X**: 매 prototype, 매 throwaway script, 매 single-developer monolith.
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## ❌ 안티패턴
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- **Spec-as-documentation only**: 매 not source of truth, 매 drift. 매 codegen-driven 의 enforce.
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- **No CI lint**: 매 spec rot. 매 Spectral / vacuum 의 사용.
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- **Big-bang spec**: 매 review fatigue. 매 incremental + path-scoped reviews.
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- **No mock**: 매 FE blocked on BE. 매 Prism mock 의 day-1 deploy.
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## 🧪 검증 / 중복
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- Verified (OpenAPI 3.1 spec, AsyncAPI spec, Stoplight docs, buf docs, ThoughtWorks Tech Radar "Design APIs first").
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- 신뢰도 A.
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## 🕓 Changelog
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| 날짜 | 변경 |
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|---|---|
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — full content (API-first workflow + tooling) |
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