---
title: "Ruzzy - Air Market"
description: "Fuzzing tools mostly assume you are working in C or Rust, which leaves Ruby out. Ruzzy is a coverage-guided fuzzer built for Ruby by Trail of Bits. Reach for it when the code you want to fuzz is Ruby…"
canonical: "https://airmarket.ai/app/ruzzy"
---

[Air Market](/) / [Security](/category/security) / Ruzzy

Skill by [Trail of Bits](/@trailofbits)

# Ruzzy

Fuzzing for Ruby, including the C extensions underneath

## What this does

Fuzzing tools mostly assume you are working in C or Rust, which leaves Ruby out. Ruzzy is a coverage-guided fuzzer built for Ruby by Trail of Bits. Reach for it when the code you want to fuzz is Ruby, whether that is pure Ruby or a C extension.

### Top 3 things it does for you

- Fuzz pure Ruby code
- Fuzz a Ruby C extension

## Information

**Ruzzy at a glance**

|  |  |
| --- | --- |
| Kind | Skill |
| Publisher | [Trail of Bits](/@trailofbits) |
| Category | [Security](/category/security) |
| Works with | Agent Skills - an open standard supported by 40+ agents |
| Size | 15 KB |
| Licence | CC-BY-SA-4.0 |
| Repository | [trailofbits/skills](https://github.com/trailofbits/skills/tree/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/ruzzy) |
| GitHub stars | 6,823 (as of Nov 2026) |
| Installs | 5,494, counted by skills.sh (Nov 2026) |

## Security report

**Verified.** AIR scanned this exact version of Ruzzy and flagged nothing. AIR's verdict: **safe**.

**What Ruzzy's check was run against**

|  |  |
| --- | --- |
| Commit | d5fe2e6a7896236c3102fd5477e833623ad70298 |
| Content hash | 62e30240a604d21bd6d4da911e5878406a9ed651e456f7b7fa16c179cd82bcbe |
| Files read | [Browse the files at this exact commit](https://github.com/trailofbits/skills/blob/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/ruzzy/SKILL.md) |

A scan is named by the exact content it read, not by a version number. A different version is a different artifact, and nothing here applies to a version AIR has not scanned.

[Read the full security report for Ruzzy](/security/ruzzy)

## About Ruzzy

Ruzzy is a coverage-guided Ruby fuzzer by Trail of Bits.

Use it for fuzzing pure Ruby code and Ruby C extensions.

## What's inside

- SKILL.md - instructions
- agents/openai.yaml - data
- assets/trail-of-bits-mark.svg - template

## Questions

### Is Ruzzy safe to install?

AIR scanned this exact version of Ruzzy and flagged nothing. AIR's verdict: safe. The verdict is named by the content that was read, at commit d5fe2e6a7896, so it cannot drift onto a version nobody scanned. The full report is at https://airmarket.ai/security/ruzzy.

### How do I install Ruzzy?

Open https://airmarket.ai/app/ruzzy on Air Market and use the install action: Air Market hands Claude a prompt naming this exact skill, and Claude sets it up. Source, pinned to the exact commit this listing describes: https://github.com/trailofbits/skills/tree/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/ruzzy. Install from that link, not the branch.

## Related on Air Market

- [More Security listings](/category/security)
- [Everything by Trail of Bits](/@trailofbits)

---

Canonical URL: <https://airmarket.ai/app/ruzzy>