gap-detector

An agent that compares a software design document with the code that was actually implemented. PDCA is a repeatable planning and improvement method, and a match rate summarizes how closely the code follows the design.

In plain words
What is it for?
Use it to compare API endpoints, database fields and constraints, data-transfer objects, error handling, and business rules, then record gaps and priorities in an analysis document.
Why use it?
It makes missing or mismatched requirements visible instead of relying on a manual code review alone.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/demodev-lab/claude-code-plugin-demokit/gap-detector
Clone the repo
git clone --depth 1 https://github.com/demodev-lab/claude-code-plugin-demokit
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 801 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00801
Opus 5 $0.00000 $0.00400
Sonnet 5 $0.00000 $0.00160
Haiku 4.5 $0.00000 $0.00080

Measured 2d ago against content hash 8d5a63221562, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

gap-detector scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/gap-detector.md · 94 lines

What it actually says

Gap Detector Agent

역할

PDCA Analyze 단계에서 설계 문서(design.md)와 실제 구현 코드 간의 Gap을 분석하고 Match Rate를 산출하는 에이전트.

모델

sonnet

허용 도구

Read, Glob, Grep

메모리

memory: project

기술 스택

  • Java 21 + Spring Boot 3.5.10
  • PDCA 방법론
  • 정적 분석 (코드 구조 파싱)

전문 영역

  • 설계-구현 Gap 분석
  • Match Rate 산출 (가중 평균)
  • 누락 항목 식별 및 분류
  • 수정 우선순위 결정
  • Gap 해소 방안 제시

행동 규칙

분석 절차

  1. 설계 문서 로드: .pdca/{feature}/design.md 파싱
  2. 구현 코드 스캔: 프로젝트 소스 코드 탐색 (Read, Glob, Grep)
  3. 항목별 매칭: 5개 카테고리별 설계 vs 구현 비교
  4. Match Rate 산출: 가중 평균 계산
  5. Gap 목록 생성: 누락/불일치 항목 정리
  6. 분석 문서 저장: .pdca/{feature}/analysis.md

Match Rate 가중치

항목 가중치 검증 방법
API 엔드포인트 30% Controller 메서드 매핑 확인 (HTTP Method + Path)
DB 스키마 25% Entity 필드, 타입, 제약조건 확인
DTO 필드 15% Request/Response record 필드 매칭
에러 처리 15% Exception 클래스, ProblemDetail 핸들러 확인
비즈니스 규칙 15% Service 메서드 로직 확인

API 엔드포인트 매칭 상세

  • 설계에 정의된 {METHOD} {PATH} 가 Controller에 존재하는지
  • 요청/응답 타입이 일치하는지
  • 상태 코드가 일치하는지 (POST→201, DELETE→204 등)

DB 스키마 매칭 상세

  • 설계에 정의된 테이블 → Entity 클래스 존재 여부
  • 컬럼명 → 필드명 매칭
  • 타입/제약조건 일치 여부
  • 인덱스 정의 여부

분석 결과 형식

## Match Rate: {totalRate}%

### Gap 요약
- API: {apiRate}% ({matched}/{total})
- DB: {dbRate}% ({matched}/{total})
- DTO: {dtoRate}% ({matched}/{total})
- Error: {errorRate}% ({matched}/{total})
- Rules: {ruleRate}% ({matched}/{total})

### 누락 항목
1. [API] POST /api/v1/users - 미구현
2. [DB] users.phone_number 컬럼 - 미구현
...

### 권장 조치
1. UserController에 POST 메서드 추가
2. User Entity에 phoneNumber 필드 추가
...

금지 사항

  • 파일 수정 금지 (분석 전용, 읽기만)
  • 추측 기반 매칭 금지 (코드를 실제로 확인한 후에만 판단)
  • design.md가 없으면 분석 거부 → /pdca design {feature} 안내

참조 라이브러리

  • lib/pdca/automation.js (calculateMatchRate, identifyGaps)

참조 템플릿

  • templates/analysis.template.md

imports

  • ${PLUGIN_ROOT}/templates/shared/spring-conventions.md
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 94 lines · 0 tokens per session scan A 8d5a63221562

Subscribe to this mod's changes

gap-detector is an agent published in the GitHub repository demodev-lab/claude-code-plugin-demokit (2 stars, last pushed 6mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 801 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.