API Compatibility and Test Gap Review SKILL.md skillA

API Compatibility and Test Gap Review from s977043/river-review is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned
mdr add s977043/river-review/API Compatibility and Test Gap Review@v0.1.0

Pins v0.1.0 in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 17 of 17 checks passed
Kind
SKILL.md skill
Repository
s977043/river-review
Path
skills/midstream/api-compatibility/SKILL.md
Versions recorded
2
Latest version
v0.1.0, committed Jun 29, 2026
First version recorded
Jun 29, 2026
Size
5,381 bytes
Repository stars
7
License
MIT

Detect breaking API contract changes, DTO modifications without compatibility handling, and missing tests for changed API boundaries.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

## Pattern declaration

Primary pattern: Reviewer
Secondary patterns: Inversion
Why: API契約変更は下流の呼び出し元を静かに壊す。差分内のDTO・インターフェース・エンドポイント定義の変更が既存呼び出し元との互換性を壊していないか、かつテストが更新されているかを検証する。

## Rule / ルール

- APIエンドポイントのリクエスト/レスポンス型(DTO)を変更する場合、既存の呼び出し元との後方互換性を保持するか、バージョニング戦略を適用する。
- DTOへのフィールド削除・型変更・必須化は破壊的変更とみなし、影響範囲のコード修正またはマイグレーションパスを確認する。
- API変更にはテスト(ユニットテスト・インテグレーションテスト・APIテスト)の更新が必須。
- オプショナルフィールド追加は後方互換だが、受信側でのnullabilityハンドリングを確認する。

## Heuristics / 判定の手がかり

- `interface` / `type` の定義でフィールドが削除または型が変更されているが、呼び出し元(サービス・コントローラ等)の修正がない。
- RESTエンドポイントのリクエストボディやクエリパラメータの型が変更されているが、対応するAPIテストが差分に含まれていない。
- レスポンス型(DTO)にフィールドが追加されているが、呼び出し元でのデシリアライズ処理が更新されていない。
- API型定義(OpenAPI schema、Zod schema等)が変更されているが、それを参照するテストが更新されていない。
- `optional` → `required`(`?` の削除)の変更があるが、既存の呼び出し元がフィールドを省略している。

## Good / Bad Examples

- Good: DTOに新フィールドを追加し、受信側コードでのハンドリングとテストを同時に追加している。
- Bad: レスポンスDTOから`userId`フィールドを削除したが、そのフィールドを参照している呼び出し元を修正していない。
- Good: 型変更(`string` → `number`)と同時に呼び出し元の変換処理とテストを更新。
- Bad: `required: true` にしたが既存テストデータがそのフィールドを含んでいない。
- Good: バージョニング(`/v2/endpoint`)で旧バージョンと共存させ段階的移行。

## Actions / 改善案

- DTOの変更箇所に対して、影響を受けるすべての呼び出し元・デシリアライズ処理を`code_search`で特定し更新する。
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add s977043/river-review/API Compatibility and Test Gap Review@sha256:aaa238053863fcd2

The line at the top of this page pins the label v0.1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_ucj7p6osa3twyale.svg)](https://markdownregistry.com/a/art_ucj7p6osa3twyale)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 2 versions of this file, all committed on Jun 29, 2026.

versioncommittedcommitsizeaudit
v0.1.0 latest2026-06-29 45e66bc 5,381 BA view · diff
v0.1.02026-06-29 b988700 5,398 BA view

Audit of the latest version

A  17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (5381 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

s977043/river-review · 7 stars · license MIT · pushed 2026-11-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_ucj7p6osa3twyale
GET https://markdownregistry.com/api/v1/resolve?ref=s977043/river-review/API Compatibility and Test Gap Review
GET https://markdownregistry.com/api/v1/blob/aaa238053863fcd2bf78c0511d8285f3f2cce7fd0fae6c530bd9bd412b2d804a

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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