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🕵️ Confusable Handle Detector
Flag the hidden and look-alike characters lurking in a handle or brand string. Catches zero-width characters, mixed-script look-alikes (a Cyrillic "а" passing as a Latin "a"), right-to-left and bidi override characters, unexpected non-ASCII, and stacked combining marks. These are the spoofing tricks and display bugs you cannot catch by reading.
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About this skill
High-Stakes Handle Security
In an era of sophisticated social engineering, a username that looks like "apple" might actually contain a Cyrillic "а" or a hidden zero-width joiner. The Confusable Handle Detector is a specialized security tool designed for developers, community managers, and security researchers to audit strings for Unicode-based spoofing attempts.
What it does
This skill performs deep inspections on handles, brand names, and text lists to identify:
- Invisible Characters: Zero-width spaces and joiners that hide in plain sight.
- Homoglyphs: Look-alike characters from different scripts (e.g., Latin 'o' vs. Greek 'ο').
- Directional Overrides: RTL/LTR markers used to flip the display order of characters.
- Mixed-Script Detection: Identifying suspicious script switching within a single word.
Why use this skill
Writing your own regex to catch every Unicode edge case is error-prone and time-consuming. This skill leverages a pre-built Python scanner and a curated reference library to provide instant, structured auditing. It moves beyond simple "Is this valid?" checks to "Is this deceptive?", providing actionable remediation snippets that help you explain risks to users or stakeholders without sounding alarmist.
The Output
Each scan produces a detailed report covering the scope inspected, a categorized list of findings by severity, and specific remediation advice based on JustHandled Labs' audit checklist.
Details
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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Security Scanned
Passed automated security review
Permissions
File Scopes
Read-only. Inspects each character against the Unicode database in the standard library. Reads no environment variables and writes nothing.
Creator
JustHandled Labs builds focused agent skills for the work nobody wants to do by hand. Each one is a single repeatable job done well: catching the security and data mistakes that quietly ship, keeping docs and tests honest, gating the commands an agent is about to run, sharpening writing, and handling the founder chores around launches, outreach, and brand setup. Not generic AI productivity. Specific workflows that are easy to run, review, and repeat. Maintained by H.J. Westerfield, with a background in communications, editing, project coordination, customer support, and practical AI systems. Tools for people who want useful automation without theatrical complexity.
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