React Router Action Contract Review SKILL.md skillA
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
React Router Action Contract Review from s977043/river-review is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add s977043/river-review/React Router Action Contract Review@v0.1.0Pins 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
plugin-dist/river-review/skills/midstream/react-router-action-contract/SKILL.md- Versions recorded
- 1
- Latest version
- v0.1.0, committed Oct 25, 2026
- Size
- 3,680 bytes
- Repository stars
- 7
- License
- MIT
Checks React Router v7 action conventions: validation errors returned as data with 4xx status (not thrown), redirect on success, and 3-branch ErrorBoundary handling.
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: action のエラー契約と ErrorBoundary 分岐をチェックリスト型で検査する
## Goal / 目的
- バリデーション失敗が ErrorBoundary へ throw され、フォームのインラインエラー表示と自動 revalidation の制御が壊れるのを防ぐ。
- action 成功時の `redirect()` 欠落による再送信問題、エラー返却時のステータス不備（2xx のまま）を検出する。
## Non-goals / 扱わないこと
- loader / data loading の規約（`react-router-loader-boundary` のスコープ）。
- Form と fetcher のどちらを使うべきかの UX 判断（要件依存のため一律指摘しない。質問に留める）。
- バリデーションライブラリの選定。
## Pre-execution Gate / 実行前ゲート
このスキルは以下の条件が**すべて**満たされない限り`NO_REVIEW`を返す。
- [ ] 差分に action / clientAction の追加・変更、または ErrorBoundary の変更が含まれている
- [ ] diff コンテキストが利用可能である
ゲート不成立時の出力: `NO_REVIEW: react-router-action-contract — action / ErrorBoundary の変更なし`
## False-positive guards / 抑制条件
- `throw data("Not Found", { status: 404 })` 等、リソース不在・認可エラーの **意図的な throw は公式に許可された規約**であり指摘しない（バリデーション失敗の throw と区別する）。
- React Router 管理外の外部 API へ直接 POST する設計が要件上正当な場合は指摘しない。
- 成功時に同一ページへ結果を表示する設計（redirect しない）が意図的な場合は質問に留める。
## Rule / ルール
- 期待されるバリデーション失敗は `return data({ errors }, { status: 400 })` で返す（throw しない。2xx のままだと不要な revalidation が走る点も確認）。
- 成功時は `redirect()` で再送信問題を防ぐ。
…Read the whole file at its exact version.
How to install
mdr add s977043/river-review/React Router Action Contract Review@sha256:9dfb34cf902198e2The 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.
[](https://markdownregistry.com/a/art_jg4axh7gyv65fgt4)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 25, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3680 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
s977043/river-review · 7 stars · license MIT · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jg4axh7gyv65fgt4 GET https://markdownregistry.com/api/v1/resolve?ref=s977043/river-review/React Router Action Contract Review GET https://markdownregistry.com/api/v1/blob/9dfb34cf902198e2344c112fb2fd361a24d9a59e40b434d4986b9280c53c4d67
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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