Invisible Unicode Injection Scan 不可視 Unicode コード注入検出 SKILL.md skillA

Invisible Unicode Injection Scan 不可視 Unicode コード注入検出 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/Invisible Unicode Injection Scan 不可視 Unicode コード注入検出@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/invisible-unicode-injection/SKILL.md
Versions recorded
1
Latest version
v0.1.0, committed Jul 23, 2026
Size
8,643 bytes
Repository stars
7
License
MIT

差分に追加されたソースコードへ混入した不可視・危険な Unicode 文字(タグ文字・異体字セレクター・ゼロ幅文字・双方向制御/マーク・変則空白)を検出する。GlassWorm 型サプライチェーン攻撃・ASCII smuggling・Trojan Source(CVE-2021-42574)でコードを不可視化する手口を、決定論的な静的解析(列挙した code point 集合に限定)として捕捉し、canary テストで誤検出の再発を防ぐ.

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: 不可視・危険な Unicode 文字の混入は、文字コード(code point)で機械的・決定論に判定できる領域が大きい。よって本スキルの一次担保は `src/lib/heuristic-review.mjs` の決定論 detector(`findInvisibleUnicode`)と canary テストが担い(`.claude/rules/review-core.md` の False-positive 責務分界 #1070)、AI レビューは canary が守る範囲を重複指摘せず、文脈的な妥当性(意図した装飾か・攻撃の疑いか)の判断に限定する。危険文字の混入が無ければ実行を止めるゲートが必要。

## Goal / 目的

- 差分へ**新規追加された**ソースコード行に含まれる、不可視・欺瞞的な Unicode 文字を検出する。
- 対象は 2026 年に急増した GlassWorm 型サプライチェーン攻撃(異体字セレクター・ゼロ幅文字でコードを不可視化)と Trojan Source(CVE-2021-42574、双方向制御文字で表示順と実行順を食い違わせる手口)とする。

## 検出カテゴリ

検出対象は以下に**列挙した code point 集合に限定**する(Unicode の不可視文字を網羅するものではない)。

- **タグ文字(Tag characters)**: U+E0000–E007F。GlassWorm 実物・ASCII smuggling・LLM プロンプトインジェクションの主要ベクタ。絵文字タグシーケンス(地域旗など、絵文字ベースに付随する正当な利用)は除外する。
- **双方向制御・マーク(Bidi control/mark)**: U+202A–202E / U+2066–2069(制御)と U+061C / U+200E / U+200F(マーク)。表示上のコード順序を実行順序とすり替える(Trojan Source / CVE-2021-42574)。
- **異体字セレクター(Variation Selector)**: U+FE00–FE0F(BMP)と U+E0100–E01EF(補助面 VS17+)。GlassWorm がペイロードを不可視に符号化する手口。絵文字の見た目切り替えとして正当な単独利用(絵文字直後の 1 個・キーキャップ)は除外する。
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add s977043/river-review/Invisible Unicode Injection Scan 不可視 Unicode コード注入検出@sha256:2b56b45296907578

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_cqqsqu3s523ihuhn.svg)](https://markdownregistry.com/a/art_cqqsqu3s523ihuhn)

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

Versions

The registry has recorded 1 version of this file, committed on Jul 23, 2026.

versioncommittedcommitsizeaudit
v0.1.0 latest2026-07-23 8792a4f 8,643 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 (8643 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_cqqsqu3s523ihuhn
GET https://markdownregistry.com/api/v1/resolve?ref=s977043/river-review/Invisible Unicode Injection Scan 不可視 Unicode コード注入検出
GET https://markdownregistry.com/api/v1/blob/2b56b452969075786eb31be156913793c7f2598142a393c3746f9d331ad4f42c

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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