Addresssanitizer

harness-writing helps you design fuzzing harnesses that turn raw bytes into meaningful, reproducible tests for a system under test. Use the harness-writing skill when you need a new fuzz target or want to improve coverage, stability, and bug-finding for Code Generation tasks. It focuses on deterministic input parsing, valid call sequences, and reproducible crashes.

Atheris is a coverage-guided Python fuzzing skill built on libFuzzer. Use the atheris skill to fuzz pure Python code and Python C extensions, find crashes, hangs, and memory-safety bugs, and support Security Audit workflows with fast, practical harness guidance.