Next.js Server Action Security 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.
Next.js Server Action Security 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/Next.js Server Action Security 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/nextjs-server-action-security/SKILL.md- Versions recorded
- 1
- Latest version
- v0.1.0, committed Oct 25, 2026
- Size
- 4,583 bytes
- Repository stars
- 7
- License
- MIT
Checks Next.js Server Actions ('use server') for missing authentication/authorization before mutations, missing input validation, and untrusted client-supplied IDs — treating each action as a public HTTP endpoint.
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: Server Action を「誰でも呼べる公開エンドポイント」と仮定し、認証・認可・入力検証の欠落をチェックリスト型で検査する。 ## Goal / 目的 - `'use server'` で公開される Server Action は **認証なしに誰でも呼べる公開 HTTP エンドポイント**である、という前提に立つ。 - mutation（DB の更新・削除・課金など）前に、セッション/認証と認可（リソース所有者確認）が検証されていない欠落を検出する。 - `formData` や引数を検証せず DB へ直接渡す入力バリデーション欠如、クライアントから渡る ID をなりすまし可能なまま信頼する誤りを検出する。 ## Non-goals / 扱わないこと - client/server 境界判定（`use client` 誤用）は `nextjs-app-router-boundary` の領域。本スキルでは扱わない。 - read-only の Server Action（mutation を伴わないもの）への認可指摘。 - 認証ライブラリ・バリデーションライブラリの選定や設計全般。 - CSRF / レート制限などインフラ層の防御（フレームワーク・基盤の責務）。 ## 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 `'use server'` 関数 / Server Action（actions.ts など）の追加・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: nextjs-server-action-security — Server Action の変更なし` ## False-positive guards / 抑制条件 - 認証チェックを共通ヘルパー（`requireUser()` / `requireAuth()` 等）に委譲しており、差分内にその呼び出しが見える場合は指摘しない。 - 公開フォーム（問い合わせ・ニュースレター登録など、認証不要が要件上正当なもの）で、その旨がコメントで明記されている mutation は、認可指摘を質問に留める。 - read-only の Server Action（mutation なし）は認可指摘の対象外。 - 入力検証を共通ヘルパーやスキーマ（zod 等）へ委譲し、差分内でその呼び出しが見える場合は指摘しない。 …
Read the whole file at its exact version.
How to install
mdr add s977043/river-review/Next.js Server Action Security Review@sha256:3894a9b5add3116cThe 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_2ptescboocddsklw)
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 (4583 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_2ptescboocddsklw GET https://markdownregistry.com/api/v1/resolve?ref=s977043/river-review/Next.js Server Action Security Review GET https://markdownregistry.com/api/v1/blob/3894a9b5add3116c091bc0be75b843d573c6e0f51f8ca6cbb8a1955ebe2ea78b
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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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