GitHub Actions Workflow Security Review SKILL.md skillA
GitHub Actions Workflow 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/GitHub Actions Workflow 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
skills/downstream/gha-workflow-security/SKILL.md- Versions recorded
- 3
- Latest version
- v0.1.0, committed Jul 14, 2026
- First version recorded
- Jun 29, 2026
- Size
- 4,315 bytes
- Repository stars
- 7
- License
- MIT
Reviews GitHub Actions workflow diffs for script injection of untrusted input, pull_request_target with untrusted checkout, over-broad GITHUB_TOKEN permissions, and unpinned third-party actions.
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: workflow の意味的なセキュリティ判断（権限の必要性・トリガーの用途）に集中し、決定論ツールが見ない文脈を検査する ## Goal / 目的 - untrusted input の式展開によるスクリプトインジェクションと、特権トリガー + untrusted checkout（pwn request）を検出する。 - GITHUB_TOKEN の過剰権限と third-party action の未ピン留めを検出する。 ## Non-goals / 扱わないこと - 構文的に決定論で判定できる領域（pinned-dependencies / token-permissions の機械検出）は OpenSSF Scorecard / zizmor / CodeQL に委ねる（重複指摘しない）。 - workflow のロジック・効率（セキュリティ以外）。 ## 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 `.github/workflows/` 配下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: gha-workflow-security — workflow の変更なし` ## False-positive guards / 抑制条件 - 同一 repo / 自 org 内 action（`./.github/actions/...`、自 org reusable workflow）はピン留め不要とする運用が一般的。minor 以下に留める。 - `actions/*` 公式 action の tag 運用は third-party より低リスク。minor 扱い。 - `if:` 条件式内の式展開、`github.event.*.number` / `github.sha` / `github.actor` 等の数値・制約付きフィールドは原則安全。 - checkout なし、または base ref checkout のみの `pull_request_target` は安全パターン。 - repo 可視性が不明な self-hosted runner は major でなく warning + 確認依頼にする。 ## Rule / ルール …
Read the whole file at its exact version.
How to install
mdr add s977043/river-review/GitHub Actions Workflow Security Review@sha256:efc5bd53795c9339The 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_tt3jviewz4ghq7oq)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jun 29, 2026 and Jul 14, 2026, about one every 8 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v0.1.0 latest | 2026-07-14 | 3a84021 | 4,315 B | A | view · diff |
| v0.1.0 | 2026-06-29 | 45e66bc | 4,302 B | A | view · diff |
| v0.1.0 | 2026-06-29 | b988700 | 4,320 B | A | view |
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 (4315 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_tt3jviewz4ghq7oq GET https://markdownregistry.com/api/v1/resolve?ref=s977043/river-review/GitHub Actions Workflow Security Review GET https://markdownregistry.com/api/v1/blob/efc5bd53795c9339ac376e303b783519c6045aeffda50eb1637f43dc8482ff95
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.
More from s977043/river-review
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