Individual skill

ruzzy

Use when asked to set up and run coverage-guided fuzzing of Ruby code or C extensions with Ruzzy, producing crash reports or clean campaign summaries. Not for C/C++ fuzzing: use libfuzzer or libfuzzer.

.devin/skills/ruzzy/SKILL.md

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Last checked: Nov 4, 2026

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Repository stars (not skill ratings): 55
Repository last updated: Sep 28, 2026
License: Apache-2.0

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# Ruzzy fuzzing campaign

## Contract

| Field | Bound contract |
|---|---|
| Trigger | User needs Ruzzy to run coverage-guided fuzzing on Ruby code or a Ruby native extension. |
| Authority | Reversible local: writes harness, tracer, sanitizer preload, corpus, and installed gem files to the working directory or the local Ruby gem path. Record the installed-gem list before install; rollback is file deletion plus uninstalling exactly the gem version this campaign added. No remote mutation. |
| Side effect | Write Ruzzy harness scripts, tracer scripts, sanitizer LD_PRELOAD paths, corpus files, and install the target gem with clang and sanitizer flags. |
| Done | Ruzzy executes the intended Ruby target with the correct tracer or extension setup and reproduces saved failures. |

## Inputs

Required: Ruby target path or gem name, sanitizer selection (ASan or UBSan).