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invisible-ink

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Scan a repository or diff for invisible and deceptive Unicode — Trojan Source bidi controls (CVE-2021-42574), homoglyph identifiers (CVE-2021-42694), zero-width characters, invisible filler identifiers, hidden tag-character text in prompts and agent instruction files, variation-selector payloads, terminal escapes, and stray BOMs. Reports escaped file:line:col findings. Read-only, no MCP, no signup.

skills/invisible-ink/SKILL.md

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Source commit e17f9081b1b1746a837bb188f6ef3245d720fc4b

What was checked

Matches the observed repository HEAD
Yes
Scanner rules are current
No
Repository scan complete
No
Skill scan complete
No
Observed behavior
Not checked yet
Last checked
Nov 4, 2026

These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.

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An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.

Repository context

Repository stars (not skill ratings)
13
Repository last updated
Nov 1, 2026
License
Apache-2.0

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

Files and excerpt

File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.

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# Invisible Ink

The code you reviewed isn't the code that runs.

A reviewer sees `if (role != "user")`. The compiler sees a string that ends somewhere
else entirely. An `admin` with a Cyrillic `а` is a different variable. A `SKILL.md`
can carry a sentence written in Unicode tag characters that no editor shows but an LLM
can read. This skill makes all of that visible.

## Prerequisites

- **None.** Python 3 runs the bundled read-only scanner [`scripts/invisible_ink.py`](scripts/invisible_ink.py).
  No MCP, no network, no packages.
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