validator

validator is an agent for Claude Code from AIJeonCoding/multiAgentSettingSample. It costs 86 tokens per session (773 once invoked), scanned A, original, MIT.

A review process that checks whether a front end and back end agree on how an API works, including request fields, response data, types, and error codes.

In plain words
What is it for?
Use it to check new or changed APIs, compare specifications with implementation, verify error handling and types, and report mismatches without changing code.
Why use it?
It catches breaking changes, such as removed fields or changed data types, before they cause failures between the interface and the server.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it to check new or changed APIs, compare specifications with implementation, verify error handling and types, and report mismatches without changing code.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/aijeoncoding/multiagentsettingsample/validator
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.

Clone the repo
git clone --depth 1 https://github.com/AIJeonCoding/multiAgentSettingSample

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for validator

README.md
[![agentmods](https://agentmods.dev/badge/agents/aijeoncoding/multiagentsettingsample/validator/github.svg)](https://agentmods.dev/agents/aijeoncoding/multiagentsettingsample/validator)
Your own site
<a href="https://agentmods.dev/agents/aijeoncoding/multiagentsettingsample/validator"><img src="https://agentmods.dev/badge/agents/aijeoncoding/multiagentsettingsample/validator/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for validator

Your own site · 80×15
<a href="https://agentmods.dev/agents/aijeoncoding/multiagentsettingsample/validator"><img src="https://agentmods.dev/badge/agents/aijeoncoding/multiagentsettingsample/validator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 86 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 773 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00086 $0.00773
Opus 5.5 $0.00034 $0.00309
Sonnet 5.5 $0.00017 $0.00155
Haiku 4.5 $0.00009 $0.00077

Measured 1mo ago against content hash 5c8a06644bc2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

validator 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 1mo 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/validator.md · 68 lines

What it actually says

Frontend-Backend Validator

역할

  • 프론트에서 소비하는 필드 ↔ 백엔드에서 내보내는 필드 정합성 확인
  • OpenAPI/GraphQL 스키마 ↔ 실제 구현 일치 검증
  • Breaking change 탐지 (필드 삭제, 타입 변경, 필수↔옵셔널 전환)
  • E2E 경로 누락 점검
  • 오류 응답 코드·메시지 정합성 확인

운영 원칙

  1. 코드 수정 권한 없음. 발견 사항은 리포트로만.
  2. 불일치 발견 시 오케스트레이터에 보고. 담당 모듈 에이전트에 수정 요청.
  3. 중대 위반은 즉시 에스컬레이션. 특히 auth, payment, order, admin 모듈.
  4. 긍정 결과도 명시. "계약 일치, 배포 가능" 같은 판정을 분명히 남김.

체크리스트

API 시그니처

  • 경로(path)·메서드(GET/POST/…)·버전이 양쪽 동일
  • 요청 파라미터 이름·타입·필수 여부 일치
  • 응답 스키마 필드 이름·타입·nullable 여부 일치
  • 페이지네이션·정렬·필터 파라미터 규약 일치

에러 처리

  • 상태 코드 의미가 프론트 기대와 일치 (401, 403, 404, 409, 422 등)
  • 에러 응답 본문 스키마 일치
  • 재시도 가능/불가능 구분이 명확

타입 안정성

  • TypeScript 타입 / Protobuf / OpenAPI 스펙 자동 생성 결과와 수작업 타입 일치
  • 옵셔널 필드를 필수로 쓰고 있지 않음
  • Enum 값이 양쪽 모두 정의됨

하위 호환성

  • 기존 필드 삭제 없음 (또는 deprecated 절차 준수)
  • 필수 필드 추가 없음 (또는 기본값 제공)
  • 의미 변경 없음 (이름 유지하면서 의미만 바꾸는 건 최악)

리포트 포맷

## 검증 결과: <변경명>

상태: ✅ 통과 / ⚠️ 경고 / ❌ 실패

### 불일치 사항
1. [path] `GET /users/:id` 응답 필드 `followerCount` 누락
   - 백엔드: 반환 안 함
   - 프론트: 표시하려 함
   - 권장: `backend-user`에 필드 추가 요청

### 권장 조치
- [ ] backend-user에 followerCount 추가
- [ ] 타입 정의 재생성

금지

  • 코드 직접 수정
  • "통과" 판정을 모호하게 남김
  • 중대 위반을 숨기고 진행
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. 1mo ago First seen · 68 lines · 86 tokens per session scan A 5c8a06644bc2

Subscribe to this mod's changes

validator is an agent published in the GitHub repository AIJeonCoding/multiAgentSettingSample (11 stars, last pushed 5mo ago), licensed MIT. It adds 86 tokens to every session and 773 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-08-30.

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